References of "Henrist, Catherine"
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See detailPhotonic management using opal-like crystals in perovskite solar cells
Lobet, Michaël ULiege; Piron, Pierre ULiege; Dewalque, Jennifer ULiege et al

Conference (2019, May 22)

Perovskite solar cells recently showed a tremendous interest among the photovoltaic community. However, little is known on the effect of light management inside PV architectures. We compare structured and ... [more ▼]

Perovskite solar cells recently showed a tremendous interest among the photovoltaic community. However, little is known on the effect of light management inside PV architectures. We compare structured and unstructured absorbing layers in order to enhance the integrated quantum efficiency. The photo-active layer is made of monolayer, bilayer or trilayer of perovskite spheres inside a TiO2 matrix. The excitation of guided resonances via Fano resonances inside the absorbing spheres enhances the integrated quantum efficiency and enables a photonic gain as high as 6.4%. Influence of sphere's radius, incident angle and incident polarization on the absorbing properties are also reported. [less ▲]

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See detailLead-free double perovskite materials for photovoltaic application
Daem, Nathan ULiege; Dewalque, Jennifer ULiege; Spronck, Gilles ULiege et al

Poster (2019, May 13)

This work consists in studying the implementation of double perovskite materials in the form of thin film and showing the effect of the deposition conditions on the structural properties (uniformity ... [more ▼]

This work consists in studying the implementation of double perovskite materials in the form of thin film and showing the effect of the deposition conditions on the structural properties (uniformity, coverage rate, roughness, thickness, crystallinity, crystallite size) and on the optoelectronic properties (light absorption, electron-hole pair generation efficiency, charge diffusion length, recombination...). Before considering ultrasonic spray pyrolysis deposition, preliminary spin-coating tests are ongoing in order to verify the formation of Cs2AgBiBr6 phase according to the protocol reported by Greul et al. (J. Mater Chem A (2017), 19972-19981). The effect of precursors concentration, thermal post-treatment (hot plate/oven, temperature/duration), antisolvent dripping, relative humidity - which are reported as critical parameters for the preparation of high efficiency lead halides perovskite solar cells - on the layer morphology have been studied. The (micro)structural properties of the layers (uniformity, coverage rate, crystallite size, crystalline phase) have been characterized by scanning electron microscopy and X-ray diffraction. To improve charge collection within the lead-free double perovskite photoactive material, we have also investigated a mesoporous TiO2 network as an electron collecting material filled by Cs2AgBiBr6. Efficiencies of 1.7 % have been reached for our best PV cells which are very promising results. [less ▲]

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See detailOpal-like CH3NH3PbI3 perovskite solar cells : effect of the 3D structuration on the conversion efficiency
Dewalque, Jennifer ULiege; Daem, Nathan ULiege; Spronck, Gilles ULiege et al

Poster (2019, May 13)

In this work, the 3D structuration of perovskite films is studied in order to highlight the effect of a periodic porous structure on the optical properties of the films (light harvesting, optical ... [more ▼]

In this work, the 3D structuration of perovskite films is studied in order to highlight the effect of a periodic porous structure on the optical properties of the films (light harvesting, optical coloration, semi-transparency…) and on the PV efficiency, in comparison with dense perovskite films usually used in planar solar cells configuration. The opal-like perovskite scaffold is obtained from templating fabrication method, with polystyrene beads as structuring agent. Five PS bead diameters are studied: 300 nm, 540 nm, 810 nm, 1.0 µm and 2.1 µm, to highlight the effect of the PS bead diameter on the optical properties of the films and on the PV efficiency. PbI2/CH3NH3I 0.7M in DMSO leads to the most covering, homogeneous and overlayer-free porous films. The PV efficiency of the corresponding cells increases with the bead diameter. A significant improvement in the PV conversion efficiency is observed thanks to the 3D structuration compared to a dense reference, due to the improvement of charge separation at the Spiro-OMeTAD/perovskite interface and thus to the reduction of charge recombination. In addition, CH3NH3PbI3 porous films prepared with 810 nm, 1000 nm and 2100 nm PS bead diameter respectively, are coloured, which is very interesting for building-integrated applications (BIPV). [less ▲]

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See detailInfluence of ZnO Surface Modification on the Photocatalytic Performance of ZnO/NiO Thin Films
Periyannan, Shanmugapriya ULiege; Manceriu, Laura ULiege; Nguyen, Ngoc Duy ULiege et al

in Catalysis Letters (2019)

Charge carrier separation is considered as a key factor in enhancing the photocatalytic process and can be maximized by mitigating surface recombination. Following this idea, the surface of zinc oxide ... [more ▼]

Charge carrier separation is considered as a key factor in enhancing the photocatalytic process and can be maximized by mitigating surface recombination. Following this idea, the surface of zinc oxide (ZnO) was modified by thermal treatment and nickel oxide (NiO) deposition. The influence of the ZnO thermal treatment and NiO deposition conditions on the ZnO surface chemistry and heterostructure interface properties were investigated by in situ X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) and correlated to the dye photodegradation efficiency. The XPS analysis confirmed a change of doping of ZnO after thermal treatment, which mainly influenced the developed band bending, and has led to an improved photocatalytic activity. For the same reason, the heterostructures based on the surface cleaned ZnO surface had higher photocatalytic efficiency than the ones based on non-cleaned ZnO. The temperature input during NiO deposition had negligible effect on the heterostructure interface properties. The photocatalytic efficiency did not follow the band bending evolution because of a dominant contribution of charge recombination across the NiO layer as indicated by PL analysis. [less ▲]

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See detailBimodal titanium oxide photoelectrodes with tuned porosity for improved light harvesting and polysiloxane-based polymer electrolyte infiltration
Bharwal, Anil Kumar ULiege; Manceriu, Laura ULiege; Alloin, Fannie et al

in Solar Energy (2019), 178

In this article, we discuss the effect of the polysiloxane-based poly(ionic liquid) (PIL) electrolytes viscosity on the infiltration into mesoporous and bimodal TiO2 thin films with different thickness ... [more ▼]

In this article, we discuss the effect of the polysiloxane-based poly(ionic liquid) (PIL) electrolytes viscosity on the infiltration into mesoporous and bimodal TiO2 thin films with different thickness, and consequently on the DSSC performance. The mesoporous films contain small mesopores of 8–10 nm, resulted from the use of Pluronic P123 surfactant (SOFT), resulting in high surface area. The DUAL (soft/hard) templated films have unique bimodal porous structures comprising 8–10 nm mesopores and 60–70 nm macropores resulted from the use of P123 and 130 nm polystyrene beads, which encouraged the electrolyte pore infiltration and light harvesting. Electrochemical impedance spectroscopy confirms the lower charge transfer resistance of the DUAL templated TiO2 films as opposed to SOFT TiO2 electrodes which corresponds to higher DSSC efficiency, despite having lower dye adsorption thanks to the improved PIL electrolyte infiltration within larger pores. The addition of ionic liquids to PIL significantly lowers the viscosity, increases the ionic conductivity and I3 − diffusion rate, resulting in noticeable improvement in photovoltaic performance in both SOFT and DUAL templated photoanodes for all the observed thickness. [less ▲]

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See detailTuning bimodal porosity in TiO2 photoanodes towards efficient solid-state dye-sensitized solar cells comprising polysiloxane-based polymer electrolyte
Bharwal, Anil Kumar; Manceriu, Laura ULiege; Alloin, Fannie et al

in Microporous and Mesoporous Materials (2019), 273

This article describes a cell architecture that achieves enhanced light harvesting with less dye quantity while simultaneously improving the performance of the polysiloxane-based solid-state dye ... [more ▼]

This article describes a cell architecture that achieves enhanced light harvesting with less dye quantity while simultaneously improving the performance of the polysiloxane-based solid-state dye-sensitized solar cells (DSSCs). We report the synthesis of bimodal mesoporous anatase TiO2 films by a dual templating approach, combining a block-copolymer template (Pluronic P123) and polystyrene nanospheres (PS) as soft and hard templates, respectively. The AFM and TEM analysis of TiO2 films revealed a mixture of mesoporous and macroporous morphology in which dual porosity is generated by combustion of soft and hard templates. The size of the macropores was varied by employing PS beads with different diameters (62, 130 and 250 nm). The influence of the macropore size on the dye loading and pore infiltration is the main purpose of this article. The bimodal porosity leads to increased light scattering due to enhanced optical path length, and better pore infiltration of the polysiloxane electrolyte is achieved. The amount of dye uptake by the dual films is lower than that of soft films because the large pore size reduces the total surface area. The optimum bimodal structure was obtained when combining P123 surfactant and the 130 nm PS beads leading to the lowest charge transfer resistance and a high efficiency for DSSCs is reported with both liquid and polymer electrolytes. Even if the dye uptake was lower, the photovoltaic performance has been maintained and improved in some devices. The open circuit voltage and fill factor were improved, owing to a successful joining of different effects i.e. increased light harvesting, facile electrolyte penetration and reduced charge recombination. [less ▲]

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See detailA colloidal approach to prepare binder and crack-free TiO2 multilayer coatings from particulate suspensions: application in DSSCs
González, Zoilo; Yus, Joaquin; Sanchez-Herencia, Antonio Javier et al

in Journal of the European Ceramic Society (2019), 39

Well-compacted and crack-free TiO⁠2 multilayer coatings have been manufactured from a colloidal approach based on the preparation of particulate suspensions for DSSC. The study of the suspension ... [more ▼]

Well-compacted and crack-free TiO⁠2 multilayer coatings have been manufactured from a colloidal approach based on the preparation of particulate suspensions for DSSC. The study of the suspension parameters to optimize dispersion and stabilization of the TiO⁠2 nanoparticle in the liquid media as well as a thermal stabilization step between the layers have been defined as two key points in the processing method to obtain interconnected microstructures, free of defects and heterogeneities, that prevent the application of an additional scattering layer or any kind of specific or clean conditions during deposition. The sintering process at low temperature, 450⁰C, has allowed obtaining open microarchitectures avoiding the complete densification and favoring the dye adsorption. A thickness of 12.8 μm resulted in a successful dye loading of 4.52×10⁠−10 mol·mm⁠−2 and a photoefficiency of 5.7%, both in the range of the others particulate systems. EIS measurements were also made to study the transfer charge phenomena. [less ▲]

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See detailHeterostructured ZnO/RuO2 photocatalyst: influence of sputtering temperature on the photocatalytic and photoelectrochemical properties
Periyannan, Shanmugapriya ULiege; Manceriu, Laura ULiege; Colson, Pierre ULiege et al

Poster (2018, June 19)

Influence of thermal conditions on the performance of heterostructured ZnO/RuO2 in their photocatalytic and photoelectrochemical properties Photocatalytic materials are highly investigated due its vital ... [more ▼]

Influence of thermal conditions on the performance of heterostructured ZnO/RuO2 in their photocatalytic and photoelectrochemical properties Photocatalytic materials are highly investigated due its vital role in wide variety of applications that could help in tackling present day environmental problems. Inspite of wide and basic investigation for several decades on promising materials, the best photocatalyst is still under research. But the decades long research helped in better understanding of the materials and mechanisms involved. This led to the improvement of materials under examination from homostructured to modified materials. One of the major limiting factors of homostructured (single) photocatalyst is the fast recombination of excited charge carriers. Among several modification techniques used to enhance the lifetime of charge carriers, heterostructure formation with two different materials is very promising. Here, we report the formation of ZnO/RuO2 by involving two steps: ZnO nanorods are grown on FTO by hydrothermal method, followed by physical deposition of RuO2 (At room temperature [RT], At RT followed by Insitu-Post Annealing at 250° & At High Temperature [HT] 400°), resulting in the formation of a heterostructure. The influence of different thermal conditions on the course of RuO2 deposition has been characterized by X-Ray Diffractometer (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-Ray Photoelectron Spectroscopy (XPS) and Photo Luminescence (PL). The crystallinity of the material and its orientation was examined by XRD. Morphological studies by SEM revealed the growth of randomly oriented ZnO nanorods on FTO, whereas images of ZnO/RuO2 resulted in no structural difference. A very thin layer of RuO2 covering the surface of ZnO nanorods was observed through TEM. This displayed the core-shell type of heterostructure formation. XPS studies of ZnO/RuO2 under varying conditions implied the shift towards lower binding energy, which indicates the bond sharing between both materials. Interface studies by step-wise deposition of RuO2 on ZnO, showed the evidence for formation of band bending between two materials, which play an important role in enhancing the charge carrier separation. PL of homostructured and heterostructured materials led to the understanding with carrier recombination process. There was evidence of significant quenching for ZnO/RuO2, compared to that of ZnO. Among ZnO/RuO2 (At RT, RT-PAd, HT) – deposition at 400° disclosed higher quenching, i.e., reduced rate of recombination. Photocatalytic and Photoelectrochemical investigations was clearly correlating to the characterizational studies, confirming the enhancement in performance with heterostructure, especially with the ZnO/RuO2 (400°). [less ▲]

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See detailLight-harvesting capabilities of dielectric sphere multilayers
Baron, Damien ULiege; Dewalque, Jennifer ULiege; Henrist, Catherine ULiege et al

in Proceedings of SPIE: The International Society for Optical Engineering (2018, March), 10541

Self-assembled synthetic opals are suitable for integration into solution-processed thin film solar cells. In this work, finite-difference time-domain simulations are carried out to tailor optical ... [more ▼]

Self-assembled synthetic opals are suitable for integration into solution-processed thin film solar cells. In this work, finite-difference time-domain simulations are carried out to tailor optical properties of monolayer and multilayers of semiconductor spheres to trap light when these structures are incorporated into thin film solar cells. In particular, architectures in which spheres are filled with a photoactive material and embedded in a lower refractive index medium are examined. Based on spectra and field intensity maps, this study demonstrates that opal-like photonic crystals obtained from colloidal templates and filled with light-absorbing material can significantly harvest light by exploiting photonic band resonances. [less ▲]

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See detailOpal-like photoanodes with photonic effects in macroporous perovskite solar cells
Dewalque, Jennifer ULiege; Baron, Damien ULiege; Spronck, Gilles ULiege et al

Poster (2018, February 28)

Organic-inorganic metal halide perovskite compounds, used either in mesoscopic or planar solar cells architectures, have allowed preparing highly efficient solid-state devices (>20%). In mesoscopic solar ... [more ▼]

Organic-inorganic metal halide perovskite compounds, used either in mesoscopic or planar solar cells architectures, have allowed preparing highly efficient solid-state devices (>20%). In mesoscopic solar cells, a mesoporous TiO2 scaffold is incorporated into the cells. However, because of the small pore size compared to the wavelengths of visible light, the scaffold barely scatters light. In this work, we propose to design periodically structured TiO2 scaffold from colloidal crystal templating fabrication method. Polystyrene beads with diameters comparable to visible light wavelengths are used as structuring agent. The resulting opal-like photonic structure will strongly interact with light and increase light harvesting. The photoanode microstructure is characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). In parallel, light interaction is modeled in order to find the best compromise in terms of photonic architecture. Sunlight absorption by the solar cells is presented and discussed with dependency of pore sizes and number of opal-like layers. [less ▲]

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See detailIs Salvage of Recently Infected Breast Implant After Breast Augmentation or Reconstruction Possible? An Experimental Study.
CASTUS, Pascal; HEYMANS, Olivier; MELIN, Pierrette ULiege et al

in Aesthetic Plastic Surgery (2018), 42

INTRODUCTION: The reinsertion of an infected implant when peri-prosthetic infection occurs early after breast augmentation or breast reconstruction remains controversial. In this experimental study, the ... [more ▼]

INTRODUCTION: The reinsertion of an infected implant when peri-prosthetic infection occurs early after breast augmentation or breast reconstruction remains controversial. In this experimental study, the authors tried to remove bacteria, and their biofilm, from the colonized surface of breast prostheses, without damaging their integrity. MATERIALS AND METHODS: A total of 112 shell samples of silicone breast prostheses, smooth (SPSS) and textured (TPSS), were colonized by S. epidermidis (SE) or S. aureus (SA) strains, all able to produce biofilms. After 15 days, all the samples were removed from the contaminated culture broth and constituted 4 groups of 20 contaminated samples: SPSS/SE (group I), SPSS/SA (group II), TPSS/SE (group III), TPSS/SE (group IV). In another group-group SEM-, 16 colonized samples were used for documentation with scanning electron microscopy (SEM). The remaining 16 samples were used to test the limits of detection of the sterility test. All samples of groups I-IV and 8 samples of group SEM were « washed » with a smooth brush in a povidone-iodine bath and rinsed with saline solution. A subset of the washed samples was sent for SEM and the others were immersed in sterile broth and were incubated at 35 °C for 3 weeks (groups I-IV). RESULTS: Fifteen days after contamination, all the samples in groups I-IV were colonized. In the SEM group, SEM images attested to the presence of bacteria in biofilm attached to the shells. After cleaning, SEM did not reveal any bacteria and there was no visible alteration in the outer structure of the shell. Sterility tests performed after decontamination in groups I-IV remained negative for all the samples. CONCLUSION: Breast prostheses recently contaminated with Staphylococci, frequently involved in peri-prosthetic breast implant infection and capable of producing biofilms, can be efficiently decontaminated by the procedure used in this study. Our decontamination procedure did not alter the surface structure of the prostheses. This decontamination procedure could allow reinsertion of an infected implant when peri-prosthetic infection occurs early after breast augmentation or breast reconstruction and when a salvage procedure is indicated. [less ▲]

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See detailUltrasonic spray deposition of electrochromic oxide films
Maho, Anthony ULiege; Manceriu, Laura ULiege; Colson, Pierre ULiege et al

Poster (2017, September)

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See detailHeterostructured photocatalytic material and the influence of its architecture
Periyannan, Shanmugapriya ULiege; Manceriu, Laura ULiege; Colson, Pierre ULiege et al

Conference (2017, May 22)

HETEROSTRUCTURED PHOTOCATALYTIC MATERIAL AND THE INFLUENCE OF ITS ARCHITECTURE The unending usage of fuels and polluting the water bodies around the world have consequently led to the decline of the ... [more ▼]

HETEROSTRUCTURED PHOTOCATALYTIC MATERIAL AND THE INFLUENCE OF ITS ARCHITECTURE The unending usage of fuels and polluting the water bodies around the world have consequently led to the decline of the health of environment. In order to mitigate the repercussions in future, one of the few serious environmental issues like energy and water crises are being addressed from several decades with wide research on photocatalysts and photocatalysis. A typical photocatalysis reaction involves three vital steps associated with charge kinetics: charge generation, transfer and consumption. They are interdependent and each of these steps needs to be improved to realize higher efficiencies. Recent advancements and developments in identifying the working mechanisms, synthesis techniques and characterizations have paved the way for gaining attentiveness towards structure engineering (Energy band + Surface + Interface engineering). Efforts taken towards the enhancement of structure engineering can capably improve efficiencies of the steps involved in charge kinetics. In this work, we have embraced the structure engineering for the preparation of metal oxide heterostructured films with controlled architecture, to enhance its photocatalytic properties. Heterostructured architecture of a photocatalyst, which consists in combining two different materials at the nanoscale, has always shown better performance than the homostructured metal oxide semiconductors. Despite the beneficial factors of an individual metal oxide - like favorable electronic configuration, ability to absorb light and excite the electrons- the major limiting factor is usually fast recombination of the excited charge carriers, which makes it a less performing photocatalyst. Here, we have prepared heterostructured photocatalysts composed by two metal oxide semiconductors, in order to favor charge separation in each component and thereby limit recombination. The material was prepared as supported thin films in three steps, to attain the heterostructure formation. First, one dimensional Zinc Oxide material (component I) was prepared using a two step wet chemical route on FTO substrates [Step 1 – spin coating the seeds layer; Step 2 – growing the nanorods by hydrothermal method]. The concentration of seeding solution and number of seeds layers, was varied to optimize the desired morphology before deposition of component II. This resulted in the growth of ZnO nanorods arrays with predominent normal orientation. The Nickel Oxide (component II) was deposited on top of the ZnO nanorods using the direct current sputtering method, using a Nickel target in presence of Oxygen. With component II – the oxygen partial pressure, deposition temperature and time were varied to study the influence of those parameters on the heterostructure formation as well as the photocatalytic activity. AFM analysis was done to investigate the adherence of material to the FTO surface and the roughness before and after deposition was compared. The formation of heterostructure between the two components was confirmed with the help of characterizations like XRD, SEM, and XPS. The XRD peak intensity of NiO was influenced by the rate of deposition, and the morphology by temperature during sputtering. At a lower rate of deposition, the layer thickness was reduced such that it was not visible anymore by SEM, but its presence was confirmed through XPS. Photocatalytic tests were performed with UV light source to analyze the photocatalyst’s degradation efficiency on Methylene Blue. [less ▲]

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See detailStraightforward prediction of the Ni1−xO layers stoichiometry by using optical and electrochemical measurements
Manceriu, Laura ULiege; Colson, Pierre ULiege; Maho, Anthony ULiege et al

in Journal of Physics: D Applied Physics (2017), 50

In this study, we propose a straightforward method for x determination in sub-stoichiometric nickel oxide (Ni1−xO) films prepared by ultrasonic spray pyrolysis on fluor-tin oxide (FTO) substrates by ... [more ▼]

In this study, we propose a straightforward method for x determination in sub-stoichiometric nickel oxide (Ni1−xO) films prepared by ultrasonic spray pyrolysis on fluor-tin oxide (FTO) substrates by varying the post-deposition thermal treatment. The Ni3+ concentration, the flat band potential (Φfb) and the open circuit potential (Voc) were determined by electrochemical impedance analysis in aqueous media and correlated to the transmission of Ni1−xO films. An x-ray photoelectron spectroscopy study was also performed to quantify the amount of Ni3+ in the films and compare it with the one determined by electrochemical analysis. The electrochromic behavior of the Ni1−xO films in non-aqueous electrolyte was investigated as well. With increasing Ni3+ concentration the films became more brownish and more conductive, both Voc and Φfb values increased. Calibration curves of transmission at 550 nm or open circuit potential versus carrier concentration were plotted and allowed the prediction of x in an unknown Ni1−xO sample. The Ni1−xO films characterized by the highest Ni3+ concentration have a darker colored state but lower transmission modulation, due to their reduced specific surface and increased crystallinity. [less ▲]

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See detailUltrasonic spray coating of electrochromic nanomaterials
Maho, Anthony ULiege; Manceriu, Laura ULiege; Colson, Pierre ULiege et al

Conference (2017, May)

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See detailInverse opal photoanodes: preparation and optical properties
Dewalque, Jennifer ULiege; Spronck, Gilles ULiege; Baron, Damien ULiege et al

Conference (2017, March 01)

Perovskite compounds, used either in mesoscopic or planar solar cells, have allowed preparing highly efficient solid-state devices (>20%). In this study, we propose to design photoanodes with photonic ... [more ▼]

Perovskite compounds, used either in mesoscopic or planar solar cells, have allowed preparing highly efficient solid-state devices (>20%). In this study, we propose to design photoanodes with photonic structure in order to modulate light interaction. The periodic structure of porosity could add specific optical properties likely to increase light harvesting and reduce reflexion losses. Besides, current efficiencies reported for mesoscopic perovskite solar cells using an inorganic porous scaffold are slightly lower than those reported for planar perovskite cells mainly due to issues in perovskite infiltration. The control of the porous network architecture in terms of pore organization, size and connectivity could overcome this limitation. TiO2/perovskite and perovskite-only photoanodes with an inverse opal porous structure are prepared from templating techniques, using polystyrene beads as structuring agent. The photoanode microstructure is further characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). In parallel, light interaction is modeled in order to find the best compromise in terms of photonic architecture (pore size, organization, thickness…). [less ▲]

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