Effects of NPB anode buffer layer on charge collection in ZnO/MEH-PPV hybrid solar cells

doi:10.1088/1674-1056/22/12/128402

Abstract We investigate the effects of (N,N’-diphenyl)-N,N’-bis(1-naphthyl)-1,1’-biphenyl-4,4’-diamine (NPB) buffer layers on charge collection in inverted ZnO/MEH-PPV hybrid devices. The insertion of a 3-nm NPB thin layer enhances the efficiency of charge collection by improving charge transport and reducing the interface energy barrier, resulting in better device performances. S-shaped light J–V curve appears when the thickness of the NPB layer reaches 25 nm, which is induced by the inefficient charge extraction from MEH-PPV to Ag. Capacitance–voltage measurements are performed to further investigate the influence of the NPB layer on charge collection from both simulations and experiments.

Keywords: NPB capacitance–voltage measurement charge collection buffer layer

Received: 24 July 2013
Revised: 19 August 2013
Accepted manuscript online:

PACS:	84.60.Jt	(Photoelectric conversion)
	84.37.+q	(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
	82.45.Mp	(Thin layers, films, monolayers, membranes)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB327704), the National Natural Science Foundation of China (Grant No. 51272022), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-10-0220), the Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20120009130005), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2012JBZ001).

Corresponding Authors: Xu Zheng
E-mail: zhengxu@bjtu.edu.cn

Cite this article:

Gong Wei (龚伟), Xu Zheng (徐征), Zhao Su-Ling (赵谡玲), Liu Xiao-Dong (刘晓东), Fan Xing (樊星), Yang Qian-Qian (杨倩倩), Kong Chao (孔超) Effects of NPB anode buffer layer on charge collection in ZnO/MEH-PPV hybrid solar cells 2013 Chin. Phys. B 22 128402

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Effects of NPB anode buffer layer on charge collection in ZnO/MEH-PPV hybrid solar cells

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