Potassium-Induced Phase Stability Enables Stable and Efficient Wide-Bandgap Perovskite Solar Cells

doi:10.1002/solr.202000098

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	Potassium-Induced Phase Stability Enables Stable and Efficient Wide-Bandgap Perovskite Solar Cells
	Wang, Lipeng 2,3; Wang, Gaoxiang 2,3; Yan, Zheng 4; Qiu, Jianhang 2; Jia, Chunxu 2,3; Zhang, Weimin 2,3; Zhen, Chao 2; Xu, Chuan 2; Tai, Kaiping 2; Jiang, Xin 1,2
刊名	SOLAR RRL
	2020-05-20
卷号	4 期号:7 页码:10
关键词	defect passivation phase segregation potassium incorporation wide-bandgap perovskite solar cells
ISSN号	2367-198X
DOI	10.1002/solr.202000098
通讯作者	Qiu, Jianhang(jhqiu@imr.ac.cn) ; Jiang, Xin(xjiang@imr.ac.cn) ; Yang, Shihe(chsyang@pku.edu.cn)
英文摘要	Wide-bandgap perovskites have great potential to enable high-efficiency tandem photovoltaics by combining with the well-established low-bandgap absorbers. However, such wide-bandgap perovskites are often necessarily constructed with a high Br content, and thus faced with issues of phase segregation-induced photoinstability and high defect density, severely hindering their photovoltaic performance. Herein, a remarkable boost of the stability and efficiency of wide-bandgap perovskite solar cells (PSCs) is demonstrated by simply incorporating potassium ions. Experiments have shown the interstitial occupancy of potassium ions in the perovskite lattice and the formation of 2D K2PbI4 at the grain boundaries, both can reduce the trap density and inhibit ion migration, and thus suppress nonradiative recombination and photoinduced phase segregation. The average power conversion efficiency (PCE) of photovoltaic devices based on the perovskite with 40% Br is improved from 15.28% to 17.94%, among which the champion efficiency is 18.38% with an optimal 15% KI incorporation. Importantly, the champion open-circuit voltage (V-oc) remains unchanged (approximate to 1.25 V) even when the bandgap reduces from 1.80 to 1.75 eV due to KI doping, effectively reducing the V-oc deficit. In addition, the unencapsulated cells can sustain 94% of the initial PCE after 2000 h of storage in ambient atmosphere, affirming their outstanding stability.
资助项目	National Nature Science Foundation of China[51402308] ; National Nature Science Foundation of China[21972006] ; Young Talent Program of Shenyang National Laboratory for Materials Science[L2019F40] ; Shenzhen Peacock Plan[KQTD2016053015544057] ; Shenzhen & Hong Kong Joint Research Program[SGLH20180622092406130] ; Guangdong Science and Technology Program[2017B030314002]
WOS研究方向	Energy & Fuels ; Materials Science
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000534035900001
资助机构	National Nature Science Foundation of China ; Young Talent Program of Shenyang National Laboratory for Materials Science ; Shenzhen Peacock Plan ; Shenzhen & Hong Kong Joint Research Program ; Guangdong Science and Technology Program
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138855]
专题	金属研究所_中国科学院金属研究所
通讯作者	Qiu, Jianhang; Jiang, Xin; Yang, Shihe
作者单位	1.Univ Siegen, Inst Mat Engn, D-57076 Siegen, Germany 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 4.Shenyang Aerosp Univ, Coll Energy & Environm, Shenyang 110136, Peoples R China 5.Peking Univ, Shenzhen Grad Sch, Sch Chem Biol & Biotechnol, Guangdong Key Lab Nanomicro Mat Res, Shenzhen 518055, Peoples R China
推荐引用方式 GB/T 7714	Wang, Lipeng,Wang, Gaoxiang,Yan, Zheng,et al. Potassium-Induced Phase Stability Enables Stable and Efficient Wide-Bandgap Perovskite Solar Cells[J]. SOLAR RRL,2020,4(7):10.
APA	Wang, Lipeng.,Wang, Gaoxiang.,Yan, Zheng.,Qiu, Jianhang.,Jia, Chunxu.,...&Yang, Shihe.(2020).Potassium-Induced Phase Stability Enables Stable and Efficient Wide-Bandgap Perovskite Solar Cells.SOLAR RRL,4(7),10.
MLA	Wang, Lipeng,et al."Potassium-Induced Phase Stability Enables Stable and Efficient Wide-Bandgap Perovskite Solar Cells".SOLAR RRL 4.7(2020):10.