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Improved Chemical Stability of Organometal Halide Perovskite Solar Cells Against Moisture and Heat by Ag Doping

Title
Improved Chemical Stability of Organometal Halide Perovskite Solar Cells Against Moisture and Heat by Ag Doping
Authors
CHAN, EUI PARKYANG, SEOK JOOJINHYEOK, CHOI송성원CHOI, WOOKJINCHO, KIL WON
Date Issued
May-2020
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Organometal halide perovskite (OHP) solar cells have been intensively studied because of their promising optoelectronic features, which has resulted in high power conversion efficiencies >23 %. Although OHP solar cells exhibit high power conversion efficiencies, their relatively poor stability is a significant obstacle to their practical use. We report that the chemical stability of OHP solar cells with respect to both moisture and heat can be improved by adding a small amount of Ag to the precursor. Ag doping increases the size of the OHP grains and reduces the size of the amorphous intergranular regions at the grain boundaries, and thereby hinders the infiltration of moisture into the OHP films and their thermal degradation. Quantum mechanical simulation reveals that Ag doping increases the energies of both the hydration reaction and heat-induced vacancy formation in OHP crystals. This procedure also improves the power conversion efficiencies of the resulting solar cells.
Keywords
Chemical stability; Conversion efficiency; Efficiency; Grain boundaries; Moisture; Perovskite; Perovskite solar cells; Quantum theory; Semiconductor doping; Textures; Halide perovskites; High power conversion; Hydration reaction; Intergranular region; Poor stability; Power conversion efficiencies; Quantum mechanical simulations; Vacancy formation; Silver
URI
http://oasis.postech.ac.kr/handle/2014.oak/103683
ISSN
1864-5631
Article Type
Article
Citation
CHEMSUSCHEM, vol. 13, no. 12, page. 3261 - 3268, 2020-05
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 CHO, KIL WON
Dept. of Chemical Enginrg
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