[en] Minimizing surface defects in perovskite films is crucial for suppressing non-radiative recombination and enhancing device performance. Herein, we propose the use of N-bromosuccinimide (NBS), a small molecule containing Lewis base carbonyl groups (C=O), to improve the quality of RbCsMAFA mixed-cation perovskite films. This surface treatment effectively reduces non-radiative charge-carrier recombination, in particular through the passivation of surface defects related to undercoordinated Pb2+ ions and halide vacancies, and significantly accelerates charge extraction from the perovskite into the Spiro-OMeTAD hole transporter. Consequently, NBS-treated PerSCs achieve a power conversion efficiency (PCE) of 18.24%, representing an 11% relative increase over the control device (16.48%). This enhancement is mainly attributed to a Voc gain of up to 40 mV and modifications in the recombination dynamics. Supporting evidence from impedance spectroscopic analyses further confirms enhanced energy-level alignment and reduced interfacial losses, improved charge transport as well as prolonged charge lifetimes within the devices. This work provides a simple yet effective approach to reduce the non-radiative recombination losses towards more efficient and stable PerSCs.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Dhifaoui, Hassen ; Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat
Colson, Pierre ; Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Spronck, Gilles ; Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Belkacem, Wajdi; University of Monastir > Group of Organic Electronic and Molecular Photovoltaics Devices, Faculty of Sciences of Monastir > Laboratory of Condensed Matter and Nanosciences
Bouazizi, Abdelaziz; University of Monastir > Group of Organic Electronic and Molecular Photovoltaics Devices, Faculty of Sciences of Monastir, > Laboratory of Condensed Matter and Nanosciences
He, Guorui; University of Potsdam > Institute of Physics and Astronomy > Soft Matter Physics and Optoelectronics
Lang, Felix; University of Potsdam > Institute of Physics and Astronomy > Soft Matter Physics and Optoelectronics
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Dewalque, Jennifer ; Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Language :
English
Title :
Reducing Non-Radiative Recombination Through Interfacial N-Bromosuccinimide Engineering for Multi-Cation Perovskite Solar Cells
Publication date :
October 2025
Journal title :
Coatings
eISSN :
2079-6412
Publisher :
MDPI, Basel, Switzerland
Volume :
15
Issue :
10
Pages :
1195
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
WBI - Wallonia-Brussels International
Funding text :
Wallonia-Brussels International Excellence Fellowships (IN WBI)
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