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Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells
Author(s) -
Wu Ming-Chung,
Li Yi-Ying,
Chan Shun-Hsiang,
Lee Kun-Mu,
Su Wei-Fang
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000093
Subject(s) - perovskite (structure) , formamidinium , energy conversion efficiency , halide , materials science , chemical engineering , barium , polyethylene glycol , ionic radius , polymer , nanotechnology , inorganic chemistry , chemistry , ion , optoelectronics , organic chemistry , composite material , engineering , metallurgy
The organic–inorganic halide perovskite solar cells (PSCs) are rapidly developed in just a few years due to its high power conversion efficiency. However, it still faces some critical issues, one of which is the presence of toxic lead (Pb 2+ ). Recent researches show that barium (Ba 2+ ) can partially replace the Pb 2+ in perovskite structure and achieve a promising device performance because of its adequate ionic radius. However, the optimal replacement amount of Ba 2+ in perovskite is still limited. Herein, the methylammonium (MA)/formamidinium (FA) mixed‐cation perovskite is used as the active layer in PSCs and Pb 2+ is partially substituted with Ba 2+ . Compared with the pure MA system, the best device efficiency can be achieved using higher Ba 2+ replacement ratio. In addition, while introducing the appropriate polymer additive, the replacement ratio can be further increased without compromise of device efficiency. Using polyethylene glycol as polymer additive, 10.0 mol% Ba‐doped MA/FA mixed‐cation PSC with an efficiency of 16.1% can be realized. It is believed that this report provides an effective strategy to fabricate high‐performance lead‐reduced PSCs.