Premium
Highly Stable and Efficient FASnI 3 ‐Based Perovskite Solar Cells by Introducing Hydrogen Bonding
Author(s) -
Meng Xiangyue,
Lin Jianbo,
Liu Xiao,
He Xin,
Wang Yong,
Noda Takeshi,
Wu Tianhao,
Yang Xudong,
Han Liyuan
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201903721
Subject(s) - materials science , perovskite (structure) , energy conversion efficiency , nucleation , iodide , tin , hydrogen bond , vinyl alcohol , crystal (programming language) , carrier lifetime , chemical engineering , nanotechnology , inorganic chemistry , optoelectronics , molecule , organic chemistry , silicon , chemistry , polymer , composite material , computer science , engineering , metallurgy , programming language
Abstract Tin‐based perovskites with narrow bandgaps and high charge‐carrier mobilities are promising candidates for the preparation of efficient lead‐free perovskite solar cells (PSCs). However, the crystalline rate of tin‐based perovskites is much faster, leading to abundant trap states and much lower open‐circuit voltage ( V oc ). Here, hydrogen bonding is introduced to retard the crystalline rate of the FASnI 3 perovskite. By adding poly(vinyl alcohol) (PVA), the OH…I − hydrogen bonding interactions between PVA and FASnI 3 have the effects of introducing nucleation sites, slowing down the crystal growth, directing the crystal orientation, reducing the trap states, and suppressing the migration of the iodide ions. In the presence of the PVA additive, the FASnI 3 –PVA PSCs attain higher power conversion efficiency of 8.9% under a reverse scan with significantly improved V oc from 0.55 to 0.63 V, which is one of the highest V oc values for FASnI 3 ‐based PSCs. More importantly, the FASnI 3 –PVA PSCs exhibit striking long‐term stability, with no decay in efficiency after 400 h of operation at the maximum power point. This approach, which makes use of the OH…I − hydrogen bonding interactions between PVA and FASnI 3 , is generally applicable for improving the efficiency and stability of the FASnI 3 ‐based PSCs.