Carrier separation and transport in perovskite solar cells studied by nanometre-scale profiling of electrical potential

被引：236

作者：

Jiang, Chun-Sheng ^{[1
]}

Yang, Mengjin ^{[1
]}

Zhou, Yuanyuan ^{[2
]}

To, Bobby ^{[1
]}

Nanayakkara, Sanjini U. ^{[1
]}

Luther, Joseph M. ^{[1
]}

Zhou, Weilie ^{[3
]}

Berry, Joseph J. ^{[1
]}

van de Lagemaat, Jao ^{[1
]}

Padture, Nitin P. ^{[2
]}

Zhu, Kai ^{[1
]}

Al-Jassim, Mowafak M. ^{[1
]}

机构：

[1] NREL, Golden, CO 80401 USA

[2] Brown Univ, Sch Engn, Providence, RI 02912 USA

[3] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

美国国家科学基金会;

关键词：

LOW-COST; EFFICIENCY; CRYSTALLIZATION; LIFETIMES;

D O I：

10.1038/ncomms9397

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：

Organometal-halide perovskite solar cells have greatly improved in just a few years to a power conversion efficiency exceeding 20%. This technology shows unprecedented promise for terawatt-scale deployment of solar energy because of its low-cost, solution-based processing and earth-abundant materials. We have studied charge separation and transport in perovskite solar cells-which are the fundamental mechanisms of device operation and critical factors for power output-by determining the junction structure across the device using the nanoelectrical characterization technique of Kelvin probe force microscopy. The distribution of electrical potential across both planar and porous devices demonstrates p-n junction structure at the TiO2/perovskite interfaces and minority-carrier diffusion/drift operation of the devices, rather than the operation mechanism of either an excitonic cell or a p-i-n structure. Combining the potential profiling results with solar cell performance parameters measured on optimized and thickened devices, we find that carrier mobility is a main factor that needs to be improved for further gains in efficiency of the perovskite solar cells.

引用

页数：10

共 35 条

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