Ma Zhu, Zhou Weiya, Huang Dejun, Liu Qianyu, Xiao Zheng, Jiang Huifeng, Yang Zhiqing, Zhang Wenfeng, Huang Yuelong
Institute of Photovoltaic, Southwest Petroleum University, Chengdu 610500. P.R. China.
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500. P. R. China.
ACS Appl Mater Interfaces. 2020 Nov 25;12(47):52500-52508. doi: 10.1021/acsami.0c12030. Epub 2020 Nov 10.
Passivation of electronic defects on the surface and at grain boundaries (GBs) of perovskite films has become one of the most effective tactics to suppress charge recombination in perovskite solar cells. It is demonstrated that trap states can be effectively passivated by Lewis acid or base functional groups. In this work, nicotinamide (NTM, commonly known as vitamin B3 or vitamin PP) serving as a Lewis base additive is introduced into the PbI and/or FAI: MABr: MACl precursor solution to obtain NTM modified perovskite films. It has been found that the NTM in the perovskite film can well passivate surface and GBs defects, control the film morphology and enhance the crystallinity via its interaction with a lone pair of electrons in nitrogen. In the presence of the NTM additive, we obtained enlarged perovskite crystal grain about 3.6 μm and a champion planar perovskite solar cell with efficiency of 21.72% and negligible hysteresis. Our findings provide an effective route for crystal growth and defect passivation to bring further increases on both efficiency and stability of perovskite solar cells.
钝化钙钛矿薄膜表面和晶界处的电子缺陷已成为抑制钙钛矿太阳能电池中电荷复合的最有效策略之一。研究表明，陷阱态可被路易斯酸或碱官能团有效钝化。在本工作中，将作为路易斯碱添加剂的烟酰胺（NTM，通常称为维生素B3或维生素PP）引入PbI和/或FAI:MABr:MACl前驱体溶液中，以获得NTM修饰的钙钛矿薄膜。研究发现，钙钛矿薄膜中的NTM可通过其与氮中孤对电子的相互作用很好地钝化表面和晶界缺陷、控制薄膜形貌并提高结晶度。在NTM添加剂存在的情况下，我们获得了约3.6μm的增大的钙钛矿晶粒以及效率为21.72%且滞后可忽略不计的冠军平面钙钛矿太阳能电池。我们的研究结果为晶体生长和缺陷钝化提供了一条有效途径，以进一步提高钙钛矿太阳能电池的效率和稳定性。
