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Detrimental Effect of Unreacted PbI 2 on the Long‐Term Stability of Perovskite Solar Cells
Author(s) -
TumenUlzii Ganbaatar,
Qin Chuanjiang,
Klotz Dino,
Leyden Matthew R.,
Wang Pangpang,
Auffray Morgan,
Fujihara Takashi,
Matsushima Toshinori,
Lee JinWook,
Lee SungJoon,
Yang Yang,
Adachi Chihaya
Publication year - 2020
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.201905035
Subject(s) - materials science , perovskite (structure) , degradation (telecommunications) , iodide , chemical engineering , solar cell , photochemistry , inorganic chemistry , optoelectronics , chemistry , telecommunications , computer science , engineering
Excess/unreacted lead iodide (PbI 2 ) has been commonly used in perovskite films for the state‐of‐the‐art solar cell applications. However, an understanding of intrinsic degradation mechanisms of perovskite solar cells (PSCs) containing unreacted PbI 2 has been still insufficient and, therefore, needs to be clarified for better operational durability. Here, it is shown that degradation of PSCs is hastened by unreacted PbI 2 crystals under continuous light illumination. Unreacted PbI 2 undergoes photodecomposition under illumination, resulting in the formation of lead and iodine in films. Thus, this photodecomposition of PbI 2 is one of the main reasons for accelerated device degradation. Therefore, this work reveals that carefully controlling the formation of unreacted PbI 2 crystals in perovskite films is very important to improve device operational stability for diverse opto‐electronic applications in the future.