TY - JOUR
T1 - The opportunities and challenges of ionic liquids in perovskite solar cells
AU - Yang, Jian
AU - Hu, Jianfei
AU - Zhang, Wenhao
AU - Han, Hongwei
AU - Chen, Yonghua
AU - Hu, Yue
N1 - Funding Information:
The authors acknowledge financial support from the National Natural Science Foundation of China (22075094) and the Fundamental Research Funds for the Central Universities.
Publisher Copyright:
© 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences
PY - 2022/11/5
Y1 - 2022/11/5
N2 - Metal halide perovskite solar cells (PSCs) have shown great potential to become the next generation of photovoltaic devices due to their simple fabrication techniques, low cost, and soaring power conversion efficiency (PCE). However, mismatched with the quickly updated PCEs, the improvement of device stability is challenging and still remains a critical hurdle in the path to commercialization. Recently, ionic liquids (ILs) have been found to play multiple roles in obtaining efficient and stable PSCs. These ILs usually consist of large organic cations and organic or inorganic anions, which have weak electrostatic attraction and are generally liquid at around 100 °C. ILs are almost non-volatile, non-flammable, with high ionic conductivity and excellent thermal and electrochemical stability. The roles of ILs in PSCs vary with their composition, that is, the types of anions and cations. In this review, we summarize the roles of anions and cations in terms of precursor solutions, additives, perovskite/charge transport layer interface engineering, and charge transport layers. This article aims to set up a structure–property-stability-performance correlations conferred by the IL in PSC and provide assistance for the anion and cation selection for improving the quality of perovskite film, optimizing interface contact, reducing defect states, and improving charge extraction and transport characteristics. Finally, the application of IL in PSCs is discussed and prospected.
AB - Metal halide perovskite solar cells (PSCs) have shown great potential to become the next generation of photovoltaic devices due to their simple fabrication techniques, low cost, and soaring power conversion efficiency (PCE). However, mismatched with the quickly updated PCEs, the improvement of device stability is challenging and still remains a critical hurdle in the path to commercialization. Recently, ionic liquids (ILs) have been found to play multiple roles in obtaining efficient and stable PSCs. These ILs usually consist of large organic cations and organic or inorganic anions, which have weak electrostatic attraction and are generally liquid at around 100 °C. ILs are almost non-volatile, non-flammable, with high ionic conductivity and excellent thermal and electrochemical stability. The roles of ILs in PSCs vary with their composition, that is, the types of anions and cations. In this review, we summarize the roles of anions and cations in terms of precursor solutions, additives, perovskite/charge transport layer interface engineering, and charge transport layers. This article aims to set up a structure–property-stability-performance correlations conferred by the IL in PSC and provide assistance for the anion and cation selection for improving the quality of perovskite film, optimizing interface contact, reducing defect states, and improving charge extraction and transport characteristics. Finally, the application of IL in PSCs is discussed and prospected.
KW - Additive
KW - Anions and cations
KW - Interface engineering
KW - Ionic liquid
KW - Perovskite solar cells
U2 - 10.1016/j.jechem.2022.10.048
DO - 10.1016/j.jechem.2022.10.048
M3 - Review article
AN - SCOPUS:85142003482
SN - 2095-4956
VL - 77
SP - 157
EP - 171
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -