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Performance Enhancement of Perovskite Solar Cells Induced by Lead Acetate as an Additive
Author(s) -
Tang Guanqi,
You Peng,
Tai Qidong,
Wu Runsheng,
Yan Feng
Publication year - 2018
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.201800066
Subject(s) - perovskite (structure) , lead acetate , crystallization , materials science , crystallinity , halide , energy conversion efficiency , chemical engineering , photovoltaics , fabrication , solution process , inorganic chemistry , photovoltaic system , optoelectronics , chemistry , organic chemistry , composite material , medicine , ecology , alternative medicine , toxicity , pathology , engineering , biology
The crystallinity of organic–inorganic hybrid lead halide perovskite active layers is critical to the performance of perovskite solar cells (PSCs). However, it is a challenge to control the crystallization process of perovskite films by solution process. Here, the fabrication of high‐efficiency PSCs by employing lead acetate (PbAc 2 ) as an additive in the perovskite precursor is demonstrated for the first time. By adding a few percent of PbAc 2 (molar ratio with respect to PbI 2 ) into the precursors, the perovskite crystallization process is significantly retarded, leading to pinhole‐free perovskite films with large grains and low defect densities. As result, the power conversion efficiencies and stability of the PSCs are substantially improved. This work provides a convenient and unique approach for preparing high‐quality perovskite films that can be used in photovoltaics as well as other optoelectronic devices.