Defect passivation via incorporation of sodium thiocyanate for achieving high-performance MAPbI3-based perovskite solar cells with enhanced stability

被引：10
|
作者：
He, You [1 ]
Wang, Jilin [1 ]
Tang, Ruibin [1 ]
Yao, Disheng [1 ]
Li, Songbo [1 ]
Dong, Pengpeng [1 ]
Li, Chao [1 ]
Long, Fei [1 ,2 ]
机构：
[1] Guilin Univ Technol, Guangxi Key Lab Opt & Elect Mat & Devices, Guilin 541004, Peoples R China
[2] Guilin Univ Technol, Collaborat Innovat Ctr Explorat Nonferrous Met Dep, 12 Jiangan Rd, Guilin 541004, Guangxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 933卷
基金：
中国国家自然科学基金;
关键词：
Sodium Thiocyanate; Grain boundaries passivation; Perovskite solar cells; Device stability; Reduced defect density; LOW-TEMPERATURE GROWTH; EFFICIENT; NA; PLANAR; FILMS; LAYERS; GRAIN;
D O I：
10.1016/j.jallcom.2022.167583
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The high density of defects in MAPbI3 perovskite films brings about severe carrier nonradiative re-combination, which lowers the photovoltaic performance and the stability of MAPbI3-based perovskite solar cells (PSCs). To tackle this issue, we prepared stable and efficient MAPbI3-based PSCs with in-corporation of sodium thiocyanate (NaSCN). NaSCN can increase grain size and improve crystallization quality of the perovskite films due to an Ostwald ripening effect of SCN- and surface passivation of Na+ which can effectively passivate the defect states and inhibit nonradiative recombination for an ultimate improvement of the device performance and stability. The excellent characteristics lead to a significant enhancement of the power conversion efficiency (PCE) from 18.1 % to 19.4 % both for MAPbI3-based and Cs0.06MA0.15FA0.79PbI2.5Br0.5-based PSCs, respectively. The unencapsulated NaSCN-treated PSCs also shows a improved stability after aging under a relative humidity of 40 +/- 5 % for 15 days. (c) 2022 Elsevier B.V. All rights reserved.
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页数：8
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