期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202300576
关键词
formate; gas-quenching; methylammonium-free; orientation; perovskite solar cells
Gas-quenching is a promising technique for the fabrication of perovskite films in order to promote the commercialization of perovskite solar cells. However, it is often difficult to obtain high-quality perovskite films when handling with methylammonium-free (MA-free) perovskites. In this study, formate additives are employed to regulate the crystallization of MA-free perovskite and improve the quality of perovskite films.
In order to promote the commercialization of perovskite solar cells, gas-quenching is considered to be a promising technique for perovskite film fabrication. However, when handling with methylammonium-free (MA-free) perovskites, it is often difficult to obtain high-quality perovskite films by gas-quenching. Herein, formate additives are employed to regulate the crystallization of MA-free perovskite, and improve the quality of perovskite films. Different additives of formamidine formate (FAFO) and potassium formate (KFO) is compared to investigate the role of formate groups in the crystallization of perovskite films prepared by gas-quenching. The FAFO additive facilitates the perovskite crystallization in (001) orientation whereas KFO favors for (111) orientation. The MA-free device with addition of FAFO demonstrate a champion power conversion efficiency of 20.94 %, compared to that of 20.14 % for KFO devices. In addition, FAFO device also exhibits improved thermal stability in ambient condition without encapsulation, extending the T-80 lifetime by 18 times compared to the pristine device.
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