Extra long electron-hole diffusion lengths in CH3NH3PbI3-xClx perovskite single crystals

被引：94
作者：
Zhang, Fengying [1 ,2 ]
Yang, Bin [2 ,3 ]
Li, Yajuan [2 ,3 ]
Deng, Weiqiao [2 ,3 ]
He, Rongxing [1 ]
机构：
[1] Southwest Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Luminescence & Real Time Analyt Chem, Chongqing 400715, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 10049, Peoples R China
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2017年 / 5卷 / 33期
基金：
中国国家自然科学基金;
关键词：
INVERSE TEMPERATURE CRYSTALLIZATION; TOTAL-ENERGY CALCULATIONS; LEAD IODIDE PEROVSKITES; WAVE BASIS-SET; HALIDE PEROVSKITES; SOLAR-CELLS; SOLUTION GROWTH; EFFICIENCY; TRANSPORT; CHLORIDE;
D O I：
10.1039/c7tc02802d
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Long electron-hole diffusion lengths in organolead trihalide compounds play a key role in achieving the remarkable performance of perovskite photovoltaics. Diffusion lengths in solution-grown CH3NH3PbI3 single crystals have been found to be greater than 175 micrometer (mm). Herein, we report the diffusion lengths in CH3NH3PbI3-xClx single crystals exceeding 380 mm under 1 Sun illumination, which is twice that in CH3NH3PbI3 single crystals. Incorporation of chlorine is found to increase the density of trap-states and reduce the valence band level; these two factors, which dominate the carrier recombination and the charge transfer, respectively, are in a competing relation. As a result, the electron-hole diffusion lengths in a CH3NH3PbI3-xClx single crystal with an optimum Cl proportion (x = 0.005) reach the maximum values. This study provides a strategy for the design of perovskite optoelectronics.
引用
收藏
页码：8431 / 8435
页数：5
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