Open AccessMolecular Design and Operational Stability: Toward Stable 3D/2D Perovskite Interlayers
Author(s) -
Paek Sanghyun,
RoldánCarmona Cristina,
Cho Kyung Taek,
Franckevičius Marius,
Kim Hobeom,
Kanda Hiroyuke,
Drigo Nikita,
Lin KunHan,
Pei Mingyuan,
Gegevičius Rokas,
Yun Hyung Joong,
Yang Hoichang,
Schouwink Pascal A.,
Corminboeuf Clémence,
Asiri Abdullah M.,
Nazeeruddin Mohammad Khaja
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202001014
Subject(s) - passivation , iodide , perovskite (structure) , halide , materials science , photovoltaic system , energy conversion efficiency , halogen , intermolecular force , layer (electronics) , chemical engineering , solar cell , nanotechnology , optoelectronics , chemistry , crystallography , inorganic chemistry , molecule , organic chemistry , alkyl , electrical engineering , engineering
Despite organic/inorganic lead halide perovskite solar cells becoming one of the most promising next‐generation photovoltaic materials, instability under heat and light soaking remains unsolved. In this work, a highly hydrophobic cation, perfluorobenzylammonium iodide (5FBzAI), is designed and a 2D perovskite with reinforced intermolecular interactions is engineered, providing improved passivation at the interface that reduces charge recombination and enhances cell stability compared with benchmark 2D systems. Motivated by the strong halogen bond interaction, (5FBzAI) 2 PbI 4 used as a capping layer aligns in in‐plane crystal orientation, inducing a reproducible increase of ≈60 mV in the V oc , a twofold improvement compared with its analogous monofluorinated phenylethylammonium iodide (PEAI) recently reported. This endows the system with high power conversion efficiency of 21.65% and extended operational stability after 1100 h of continuous illumination, outlining directions for future work.