Hole selective NiO contact for efficient perovskite solar cells with carbon electrode

Xiaobao Xu; Zonghao Liu; Zhixiang Zuo; Meng Zhang; Zhixin Zhao; Yan Shen; Huanping Zhou; Qi Chen; Yang Yang; Mingkui Wang

doi:10.1021/nl504701y

Hole selective NiO contact for efficient perovskite solar cells with carbon electrode

Nano Lett. 2015 Apr 8;15(4):2402-8. doi: 10.1021/nl504701y. Epub 2015 Mar 27.

Authors

Xiaobao Xu^{1

2}, Zonghao Liu¹, Zhixiang Zuo¹, Meng Zhang¹, Zhixin Zhao¹, Yan Shen¹, Huanping Zhou², Qi Chen², Yang Yang², Mingkui Wang¹

Affiliations

¹ †Michael Grätzel Centre for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. China.
² ‡Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States.

PMID: 25807395
DOI: 10.1021/nl504701y

Abstract

In this study, we communicate an investigation on efficient CH3NH3PbI3-based solar cells with carbon electrode using mesoporous TiO2 and NiO layers as electron and hole selective contacts. The device possesses an appreciated power conversion efficiency of 14.9% under AM 1.5G illumination. The detailed information can be disclosed with impedance spectroscopy via tuning the interfaces between CH3NH3PbI3 and different charge selective contacts. The results clearly show charge accumulation at the interface of CH3NH3PbI3. The NiO is believed to efficiently accelerate charge extraction to the external circuit. The extracted charge could improve photovoltaic performance by shifting hole Fermi level down, achieving a high device photovoltage. A fast interfacial recombination at the interface of CH3NH3PbI3/electron selective contact layer (mesoporous TiO2), occurring in millisecond domains, is the critical issue for charge carrier recombination loss.

Keywords: Perovskite; impedance; interface charge transfer; metal oxide; solar cell.

Publication types

Research Support, Non-U.S. Gov't