Liu Jianbo, Cao Jingwen, Zhang Meng, Sun Xiaoran, Hou Tian, Yang Xiangyu, Xiang Linhu, Liu Xin, Fu Zhipeng, Huang Yuelong, Wang Feng, Zhang Wenhua, Hao Xiaojing
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, New South Wales, 2052, Australia.
Adv Sci (Weinh). 2024 Dec;11(46):e2410266. doi: 10.1002/advs.202410266. Epub 2024 Oct 22.
The α-c (α-FAPbI) has been extensively employed in the fabrication of high-efficiency perovskite solar cells, yet heavily relied on multiple additives in upscalable fabrication in air. In this work, a simple α-FAPbI ink is developed for the blade-coating fabrication of phase-pure α-FAPbI in ambient air free from any additives containing extrinsic ions. The introduction of 2-imidazolidinone (IMD) to the FAPbI precursor inks leads to the formation of intermediate phases that change the phase transition pathway from δ-FAPbI to α-FAPbI by tilting the PbI octahedrons with strong coordination to Pb. Furthermore, the IMD ligands in the intermediate phase gradually escape from the perovskite film during the annealing, leaving a phase-pure α-FAPbI film vertically grown with large grains. Consequently, the small-sized PSCs fabricated with blade-coated α-FAPbI film achieve an efficiency of up to 23.14%, and the corresponding mini-module yields an efficiency of 19.66%. The device performance is among the highest reported for phase-pure α-FAPbI PSCs fabricated in the air without non-native cations or chloride additives, offering a simple and robust fabrication approach of phase-pure α-FAPbI films for PV application.
α - c（α - FAPbI）已被广泛应用于高效钙钛矿太阳能电池的制备中，但在空气中进行可扩大规模的制备时严重依赖多种添加剂。在这项工作中，开发了一种简单的α - FAPbI油墨，用于在环境空气中通过刮刀涂布制备无任何含外来离子添加剂的纯相α - FAPbI。将2 - 咪唑啉酮（IMD）引入FAPbI前驱体油墨中会导致中间相的形成，该中间相通过使与Pb具有强配位作用的PbI八面体倾斜来改变从δ - FAPbI到α - FAPbI的相变途径。此外，中间相中的IMD配体在退火过程中逐渐从钙钛矿薄膜中逸出，留下垂直生长且具有大晶粒的纯相α - FAPbI薄膜。因此，用刮刀涂布的α - FAPbI薄膜制备的小型PSC效率高达23.14%，相应的微型模块效率为19.66%。该器件性能是在空气中制备的无非本征阳离子或氯添加剂的纯相α - FAPbI PSC中报道的最高性能之一，为光伏应用提供了一种简单且稳健的纯相α - FAPbI薄膜制备方法。
