School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China.
The Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Chemistry. 2023 Jul 3;29(37):e202300576. doi: 10.1002/chem.202300576. Epub 2023 May 10.
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 lifetime by 18 times compared to the pristine device.
为了促进钙钛矿太阳能电池的商业化，气淬被认为是一种有前途的钙钛矿薄膜制备技术。然而，在处理不含甲脒（MA-free）的钙钛矿时，通过气淬往往难以获得高质量的钙钛矿薄膜。在此，甲酸盐添加剂被用于调控 MA-free 钙钛矿的结晶，从而改善钙钛矿薄膜的质量。本文比较了甲脒甲酸盐（FAFO）和甲酸钾（KFO）两种不同添加剂在气淬法制备钙钛矿薄膜中的结晶作用。FAFO 添加剂促进了（001）取向的钙钛矿结晶，而 KFO 则有利于（111）取向的钙钛矿结晶。添加 FAFO 的 MA-free 器件的冠军功率转换效率为 20.94%，而添加 KFO 的器件的效率为 20.14%。此外，FAFO 器件在没有封装的情况下，在环境条件下表现出更好的热稳定性，与原始器件相比，T 寿命延长了 18 倍。
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