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Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy
Author(s) -
Feng Jiangshan,
Zhu Xuejie,
Yang Zhou,
Zhang Xiaorong,
Niu Jinzhi,
Wang Ziyu,
Zuo Shengnan,
Priya Shashank,
Liu Shengzhong Frank,
Yang Dong
Publication year - 2018
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.201801418
Subject(s) - crystallinity , materials science , perovskite (structure) , energy conversion efficiency , fourier transform infrared spectroscopy , crystallization , grain size , grain boundary , chemical engineering , perovskite solar cell , kinetics , degradation (telecommunications) , nanotechnology , optoelectronics , microstructure , composite material , electronic engineering , physics , quantum mechanics , engineering
Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F‐PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F‐PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb 2+ to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F‐PSCs. Meanwhile, the environmental stability of the F‐PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F‐PSCs for practical applications.