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Open Access Nano Express

Controllable synthesis of flake-like Al-doped ZnO nanostructures and its application in inverted organic solar cells

Xi Fan, Guojia Fang*, Shishang Guo, Nishuang Liu, Huimin Gao, Pingli Qin, Songzhan Li, Hao Long, Qiao Zheng and Xingzhong Zhao

Author Affiliations

Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Department of Electronic Science and Technology, School of Physics and Technology, Wuhan University, Wuhan, 430072, People's Republic of China

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Nanoscale Research Letters 2011, 6:546  doi:10.1186/1556-276X-6-546

Published: 4 October 2011

Abstract

Flake-like Al-doped ZnO (AZO) nanostructures including dense AZO nanorods were obtained via a low-temperature (100°C) hydrothermal process. By doping and varying Al concentrations, the electrical conductivity (σ) and morphology of the AZO nanostructures can be readily controlled. The effect of σ and morphology of the AZO nanostructures on the performance of the inverted organic solar cells (IOSCs) was studied. It presents that the optimized power conversion efficiency of the AZO-based IOSCs is improved by approximately 58.7% compared with that of un-doped ZnO-based IOSCs. This is attributed to that the flake-like AZO nanostructures of high σ and tunable morphology not only provide a high-conduction pathway to facilitate electron transport but also lead to a large interfacial area for exciton dissociation and charge collection by electrodes.

Keywords:
Al-doped ZnO; inverted organic solar cell; electrical conductivity; morphology