Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
Defect passivation is nowadays considered a must-have route for high-efficiency perovskite solar cells. However, a general rule that correlates the choice of passivating agents with performance enhancements is still missing. This work compares two different thiophene salts used as passivating agents, namely thiophenemethylammonium chloride (TMACl) and thiophene ethylammonium chloride (TEACl), used for the passivation of bulk and surface defects in triple-cation (CsFAMA) based metal halide perovskites. First, we observe that the surface passivation method leads to better device performances reaching a power conversion efficiency of23.56%, with reduced voltage losses and increased fill factor when compared tothe reference. Second, we demonstrate that the chemical structure of the cation dictates its capability either in passivating bulk defects effectively or to form a superficial 2D/3D heterostructure, which happens only for the TEACl case.The chemical composition and the cation dimension are responsible for device performance enhancement as observed by a joint spectroscopic and density functional theory simulations study, providing rational guidelines for further smart device design.
This work was supported by FARE Ricerca in Italia Project (EXPRESS, no R18ENKMTA3) and the Fondazione Cariplo Economia Circolare 2021 Project (FLHYPER, no 20201067). The authors acknowledge the support from the Ministero dell’Universita` e della Ricerca (MUR) and the University of Pavia through the program ‘‘Dipartimenti di Eccellenza 2023–2027’’. The authors acknowledge the support of HERO Project through King Abdullah University of Science and Technology (KAUST). The authors are grateful for the technical support for Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (SINANO). The authors acknowledge support from King Abdullah University of Science and Technology (KAUST) Global Fellowship Program under Award No. ORA-2022-5002. Via our membership of the UK's HEC Materials Chemistry Consortium, which is funded by EPSRC (EP/X035859/1), this work used the ARCHER2 UK National Supercomputing Service (http://www.archer2.ac.uk).
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