TY - JOUR
T1 - Critical Role of Removing Impurities in Nickel Oxide on High-Efficiency and Long-Term Stability of Inverted Perovskite Solar Cells
AU - Wang, Shuangjie
AU - Li, Yuke
AU - Yang, Jiabao
AU - Wang, Tong
AU - Yang, Bowen
AU - Cao, Qi
AU - Pu, Xingyu
AU - Etgar, Lioz
AU - Han, Jian
AU - Zhao, Junsong
AU - Li, Xuanhua
AU - Hagfeldt, Anders
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/4/25
Y1 - 2022/4/25
N2 - The performance enhancement of inverted perovskite solar cells applying nickel oxide (NiOx) as the hole transport layer (HTL) has been limited by impurity ions (such as nitrate ions). Herein, we have proposed a strategy to obtain high-quality NiOx nanoparticles via an ionic liquid-assisted synthesis method (NiOx-IL). Experimental and theoretical results illustrate that the cation of the ionic liquid can inhibit the adsorption of impurity ions on nickel hydroxide through a strong hydrogen bond and low adsorption energy, thereby obtaining NiOx-IL HTL with high conductivity and strong hole-extraction ability. Importantly, the removal of impurity ions can effectively suppress the redox reaction between the NiOx film and the perovskite film, thus slowing down the deterioration of device performance. Consequently, the modified inverted device shows a striking efficiency exceeding 22.62 %, and superior stability maintaining 92 % efficiency at a maximum power point tracking under one sun illumination for 1000 h.
AB - The performance enhancement of inverted perovskite solar cells applying nickel oxide (NiOx) as the hole transport layer (HTL) has been limited by impurity ions (such as nitrate ions). Herein, we have proposed a strategy to obtain high-quality NiOx nanoparticles via an ionic liquid-assisted synthesis method (NiOx-IL). Experimental and theoretical results illustrate that the cation of the ionic liquid can inhibit the adsorption of impurity ions on nickel hydroxide through a strong hydrogen bond and low adsorption energy, thereby obtaining NiOx-IL HTL with high conductivity and strong hole-extraction ability. Importantly, the removal of impurity ions can effectively suppress the redox reaction between the NiOx film and the perovskite film, thus slowing down the deterioration of device performance. Consequently, the modified inverted device shows a striking efficiency exceeding 22.62 %, and superior stability maintaining 92 % efficiency at a maximum power point tracking under one sun illumination for 1000 h.
KW - Hole Transport Layer
KW - Interfacial Redox Reaction
KW - Nickel Oxide
KW - Perovskite Solar Cells
UR - http://www.scopus.com/inward/record.url?scp=85125561694&partnerID=8YFLogxK
U2 - 10.1002/anie.202116534
DO - 10.1002/anie.202116534
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C2 - 35174939
AN - SCOPUS:85125561694
SN - 1433-7851
VL - 61
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 18
M1 - e202116534
ER -