A simple method for phase control in two-dimensional perovskite solar cells

被引：47
作者：
Ma, Chunqing [1 ,2 ]
Lo, Ming-Fai [1 ,2 ]
Lee, Chun-Sing [1 ,2 ]
机构：
[1] City Univ Hong Kong, Dept Chem, Ctr Super Diamond & Adv Films COSDAF, Hong Kong, Hong Kong, Peoples R China
[2] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Guangdong, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 39期
基金：
中国国家自然科学基金;
关键词：
PHOTOVOLTAIC PERFORMANCE; PLANAR HETEROJUNCTION; HALIDE PEROVSKITES; 2D PEROVSKITES; STABILITY; CRYSTALS; ELECTRON; CATIONS;
D O I：
10.1039/c8ta06976j
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：
Two-dimensional (2D) A'(2)MA(n-1)Pb(n)I(3n+1) perovskites with n = 4 have attracted much attention recently and the low-n (e.g. n = 1) phases in these 2D perovskites have been found to act as carrier traps, leading to decreased performance. In this work, we demonstrate a simple method to suppress the formation of low-n phases by using dimethyl sulfoxide (DMSO) as a co-solvent. The present 2D perovskites with alternating cations in the interlayer space (ACI) exhibit enhanced carrier lifetime and charge transport by suppressing low-n phases. The optimized 2D ACI-based perovskite solar cell shows a PCE of 12.8%, which is also the highest efficiency for ACI-based perovskite solar cells, and is almost 3 times higher than that of the non-DMSO treated devices.
引用
收藏
页码：18871 / 18876
页数：6
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