Growing large columnar grains of CH3NH3PbI3using the solid-state reaction method enhanced by less-crystallized nanoporous PbI2films

doi:10.1016/j.jpowsour.2017.01.108

	Growing large columnar grains of CH3NH3PbI3using the solid-state reaction method enhanced by less-crystallized nanoporous PbI2films
	Zheng, Huifeng 1,2; Wang, Weiqi 1,2; Liu, Yangqiao 1,3; Sun, Jing 1
刊名	Journal of Power Sources
	2017
卷号	344 页码:46-55
ISSN号	03787753
DOI	10.1016/j.jpowsour.2017.01.108
英文摘要	Compact, pinhole-free and PbI2-free perovskite films, are desirable for high-performance perovskite solar cells (PSCs), especially if large columnar grains are obtained in which the adverse effects of grain boundaries will be minimized. However, the conventional solid-state reaction methods, originated from the two-step method, failed to grow columnar grains of CH3NH3PbI3in a facile way. Here, we demonstrate a strategy for growing large columnar grains of CH3NH3PbI3, by less-crystallized nanoporous PbI2(ln-PbI2) film enhanced solid-state reaction method. We demonstrated columnar grains were obtainable only when ln-PbI2films were applied. Therefore, the replacement of compact PbI2by ln-PbI2in the solid-sate reaction, leads to higher power conversion efficiency, better reproducibility, better stability and less hysteresis. Furthermore, by systematically investigating the effects of annealing temperature and duration, we found that an annealing temperature ≥120 °C was also critical for growing columnar grains. With the optimal process, a champion efficiency of 16.4% was obtained and the average efficiency reached 14.2%. Finally, the mechanism of growing columnar grains was investigated, in which a VPb″-assisted hooping model was proposed. This work reveals the origins of grain growth in the solid-state reaction method, which will contribute to preparing high quality perovskite films with much larger columnar grains. © 2017 Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/25813]
专题	中国科学院上海硅酸盐研究所
作者单位	1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China; 2.University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing; 100049, China; 3.Suzhou Institute of SICCAS (Shanghai Institute of Ceramics, Chinese Academy of Sciences), 238 North Changchun Road, Taicang; Jiangsu Province; 215499, China
推荐引用方式 GB/T 7714	Zheng, Huifeng,Wang, Weiqi,Liu, Yangqiao,et al. Growing large columnar grains of CH3NH3PbI3using the solid-state reaction method enhanced by less-crystallized nanoporous PbI2films[J]. Journal of Power Sources,2017,344:46-55.
APA	Zheng, Huifeng,Wang, Weiqi,Liu, Yangqiao,&Sun, Jing.(2017).Growing large columnar grains of CH3NH3PbI3using the solid-state reaction method enhanced by less-crystallized nanoporous PbI2films.Journal of Power Sources,344,46-55.
MLA	Zheng, Huifeng,et al."Growing large columnar grains of CH3NH3PbI3using the solid-state reaction method enhanced by less-crystallized nanoporous PbI2films".Journal of Power Sources 344(2017):46-55.