High-Quality (CH3NH3)3Bi2I9 Film-Based Solar Cells: Pushing Efficiency up to 1.64%

被引：227

作者：

Zhang, Zheng

Li, Xiaowei

Xia, Xiaohong

Wang, Zhuo

Huang, Zhongbing

Lei, Binglong ^{[1
]}

Gao, Yun ^{[1
]}

机构：

[1] Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Key Lab Green Preparat & Applicat Funct Mat, Minist Of Educ,Sch Mat Sci & Engn, Wuhan 430062, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 17期

关键词：

METHYLAMMONIUM BISMUTH IODIDE; LEAD-FREE; OPTICAL-ABSORPTION; SINGLE-CRYSTALS; PEROVSKITE; CH3NH3PBI3; ELECTRON; LAYER; ABSORBER; LENGTHS;

D O I：

10.1021/acs.jpclett.7b01952

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：

Bismuth-based solar cells have exhibited some advantages over lead perovskite solar cells for nontoxicity and superior stability, which are currently two main concerns in the photovoltaic community. As for the perovskite-related compound (CH3NH3)(3)Bi2I9 applied for solar cells, the conversion efficiency is severely restricted by the unsatisfactory photoactive film quality. Herein we report a novel two-step approach high-vacuum BiI3 deposition and low-vacuum homogeneous transformation of BiI3 to (CH3NH3)(3)Bi2I9 for highly compact, pinhole-free, large-grained films, which are characterized with absorption coefficient, trap density of states, and charge diffusion length comparable to those of some lead perovskite analogues. Accordingly, the solar cells have realized a record power conversion of efficiency of 1.64% and also a high external quantum efficiency approaching 60%. Our work demonstrates the potential of (CH3NH3)(3)Bi2I9 for highly efficient and long-term stable solar cells.

引用

页码：4300 / 4307

页数：8

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