Elucidating the charge carrier separation and working mechanism of CH3NH3PbI3-xClx perovskite solar cells

被引：502

作者：

Edri, Eran ^{[1
]}

Kirmayer, Saar ^{[1
]}

Mukhopadhyay, Sabyasachi ^{[1
]}

Gartsman, Konstantin ^{[2
]}

Hodes, Gary ^{[1
]}

Cahen, David ^{[1
]}

机构：

[1] Weizmann Inst Sci, Fac Chem, Dept Mat & Interfaces, IL-76100 Rehovot, Israel

[2] Weizmann Inst Sci, Fac Chem, Dept Chem Res Support, IL-76100 Rehovot, Israel

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

SURFACE RECOMBINATION VELOCITY; BEAM-INDUCED CURRENT; DIFFUSION LENGTH;

D O I：

10.1038/ncomms4461

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Developments in organic-inorganic lead halide-based perovskite solar cells have been meteoric over the last 2 years, with small-area efficiencies surpassing 15%. We address the fundamental issue of how these cells work by applying a scanning electron microscopy-based technique to cell cross-sections. By mapping the variation in efficiency of charge separation and collection in the cross-sections, we show the presence of two prime high efficiency locations, one at/near the absorber/hole-blocking-layer, and the second at/near the absorber/electron-blocking-layer interfaces, with the former more pronounced. This 'twin-peaks' profile is characteristic of a p-i-n solar cell, with a layer of low-doped, high electronic quality semiconductor, between a p-and an n-layer. If the electron blocker is replaced by a gold contact, only a heterojunction at the absorber/hole-blocking interface remains.

引用

页数：8

共 26 条

[1] Multiple quantum well GaAs/AlGaAs solar cells:: transport and recombination properties by means of EBIC and cathodoluminescence [J].