References of "Maho, Anthony"
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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 detailAqueous Processing of Polymer-Coated Tin-Doped Indium Oxide (ITO) Nanocrystals as Electrochromic Thin Films
Saez Cabezas, Camila A.; Maho, Anthony ULiege; Meyertons, Kendall A. et al

Poster (2019)

Detailed reference viewed: 70 (3 ULiège)
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See detailInsight into the electrical properties damaging with quenching of the SnO2:F layers
Manceriu, Laura ULiege; Maho, Anthony ULiege; Labrugère, Christine et al

Conference (2018, June 18)

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See detailSpray coating as scalable deposition technique of TiO2 blocking layer to boost the perovskite solar cell performances
Schrijnemakers, Audrey ULiege; Dewalque, Jennifer ULiege; Spronck, Gilles ULiege et al

Poster (2018, February 28)

To achieve high efficiency, the blocking layer (BL) is of critical importance in perovskite solar cells. Indeed, substrate has to be covered by a dense TiO2 film to prevent short circuits in the final PV ... [more ▼]

To achieve high efficiency, the blocking layer (BL) is of critical importance in perovskite solar cells. Indeed, substrate has to be covered by a dense TiO2 film to prevent short circuits in the final PV cell. In this study, we compare the spin coating (SC) technique - commonly used for the TiO2 blocking layer deposition in solid-state methylammonium lead triiodide perovskite (MaPbI3)-based solar cells - with ultrasonic spray pyrolysis (USP). Ultrasonic spray coating is a promising non-vacuum pathway to manufacture blocking layer that can be implemented from laboratory to industrial scale. The BL microstructure is characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). Although both deposition techniques lead to similar coating thickness and structure, the cyclic voltammetry measurements highlight the higher blocking capability of the ultrasonic spray pyrolysis BL. The BLs were tested in complete solar cell devices. Performance of perovskite solar cells is discussed and related to the morphology and the conductivity of the TiO2 blocking layers. [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 detailSynthesis, characterization, and catalytic evaluation of ruthenium–diphosphine complexes bearing xanthate ligands
Zain Aldin, Mohammed; Maho, Anthony ULiege; Zaragoza, Guillermo et al

in Dalton Transactions (2018), 47

The reaction of [RuCl2(p-cymene)]2 with potassium O-ethylxanthate and a set of nine representative Ph2P–X–PPh2 bidentate phosphines (dppm, dppe, dppp, dppb, dpppe, dppen, dppbz, dppf, and DPEphos ... [more ▼]

The reaction of [RuCl2(p-cymene)]2 with potassium O-ethylxanthate and a set of nine representative Ph2P–X–PPh2 bidentate phosphines (dppm, dppe, dppp, dppb, dpppe, dppen, dppbz, dppf, and DPEphos) afforded monometallic [Ru(S2COEt)2(diphos)] chelates 1–9 in 62–96% yield. All the products were fully characterized by using various analytical techniques and their molecular structures were determined by X-ray crystallography. They featured a highly distorted octahedral geometry with a S–Ru–S bite angle close to 72° and P–Ru–P angles ranging between 73° and 103°. Bond lengths and IR stretching frequencies recorded for the anionic xanthate ligands strongly suggested a significant contribution of the EtO+CS22− resonance form. 1H NMR and XRD analyses showed that the methylene protons of the ethyl groups were diastereotopic due to a strong locking of their conformation by a neighboring phenyl ring. On cyclic voltammetry, quasi-reversible waves were observed for the Ru2+/Ru3+ redox couples with E1/2 values ranging between 0.65 and 0.80 V vs. Ag/AgCl. The activity of chelates 1–9 was probed in three catalytic processes, viz., the synthesis of vinyl esters from benzoic acid and 1-hexyne, the cyclopropanation of styrene with ethyl diazoacetate, and the atom transfer radical addition of carbon tetrachloride and methyl methacrylate. In the first case, 31P NMR analysis of the reaction mixtures showed that the starting complexes remained mostly unaltered despite the harsh thermal treatment that was applied to them. In the second case, monitoring the rate of nitrogen evolution revealed that all the catalysts under investigation behaved similarly and were rather slow initiators. In the third case, [Ru(S2COEt)2(dppm)] was singled out as a very active and selective catalyst already at 140 °C, whereas most of the other complexes resisted degradation up to 160 °C and were only moderately active. Altogether, these results were in line with the high stability displayed by [Ru(S2COEt)2(diphos)] chelates 1-9. [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)

Detailed reference viewed: 65 (12 ULiège)
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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 deposition of electrochromic nanocoatings
Maho, Anthony ULiege

Scientific conference (2017, May 05)

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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)

Detailed reference viewed: 49 (10 ULiège)
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See detailUltrasonic spray pyrolysis as a processing route for templated electrochromic tungsten oxide films
Chatzikyriakou, Dafni ULiege; Maho, Anthony ULiege; Cloots, Rudi ULiege et al

in Microporous and Mesoporous Materials (2017), 240

Detailed reference viewed: 50 (18 ULiège)
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See detailComparison of Indium Tin Oxide and Indium Tungsten Oxide as Transparent Conductive Substrates for WO3-Based Electrochromic Devices
Maho, Anthony ULiege; Nicolay, Sylvain; Manceriu, Laura ULiege et al

in Journal of the Electrochemical Society (2017), 164(2), 25-31

Detailed reference viewed: 66 (28 ULiège)
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See detailSurfactant-assisted USP deposition of WO3 electrochromic thin films on various TCO-glass substrates
Maho, Anthony ULiege; Nicolay, Sylvain; Manceriu, Laura ULiege et al

Conference (2016, August 31)

Detailed reference viewed: 46 (9 ULiège)