Wang Jin, Liu Le, Chen Siqi, Qi Lu, Zhao Min, Zhao Chengjie, Tang Jin, Cai Xu, Lu Fushen, Jiu Tonggang
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong, 515063, China.
Science Center for Material Creation and Energy Conversion, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China.
Small. 2022 Jan;18(3):e2104100. doi: 10.1002/smll.202104100. Epub 2021 Nov 5.
The regulation of perovskite crystallization and nanostructure have revolutionized the development of high-performance perovskite solar cells (PSCs) in recent years. Yet the problem of stably passivating perovskite surface defects remains perplexing. The 1D perovskites possess superior physical properties compared with bulk crystals, such as excellent moisture stability, self-healing property, and surface defects passivation. Here, 4-chlorobenzamidine hydrochloride (CBAH) is developed as spacer to form orientationally crystallized nanorod-like 1D perovskite on the top surface of 3D perovskite for surface passivation of FAPbI perovskite. Further structure characterizations indicate the coexistence of 1D-3D hybrid perovskite lattices in nanorod-like perovskite passivation layer, which regulates the crystallization and morphology effectively and assists in promoting charge extraction, and suppressing charge recombination. As a result, the CBAH treated FAPbI -based PSCs exhibit a boosted power conversion efficiency of 21.95%. More importantly, the resultant unencapsulated devices display improved thermal, moisture, and illumination stability, and high reproducibility in terms of device performance. These results indicate the potential of organic halide salts for regulation of perovskite crystallization, offering a promising route of utilizing 1D perovskites nanorods in photovoltaic fields.
近年来，钙钛矿结晶和纳米结构的调控彻底改变了高性能钙钛矿太阳能电池（PSC）的发展。然而，稳定钝化钙钛矿表面缺陷的问题仍然令人困惑。与块状晶体相比，一维钙钛矿具有优异的物理性能，如出色的水分稳定性、自愈性能和表面缺陷钝化性能。在此，开发了盐酸4-氯苯甲脒（CBAH）作为间隔物，以在三维钙钛矿的顶表面形成取向结晶的纳米棒状一维钙钛矿，用于FAPbI钙钛矿的表面钝化。进一步的结构表征表明，纳米棒状钙钛矿钝化层中存在一维-三维混合钙钛矿晶格，其有效地调节了结晶和形貌，并有助于促进电荷提取和抑制电荷复合。结果，经CBAH处理的基于FAPbI的PSC表现出21.95%的提高的功率转换效率。更重要的是，所得的未封装器件在热稳定性、水分稳定性和光照稳定性方面有所改善，并且在器件性能方面具有高再现性。这些结果表明有机卤化物盐在调控钙钛矿结晶方面的潜力，为在光伏领域利用一维钙钛矿纳米棒提供了一条有前景的途径。
