Open Access Nano Express

Fabrication of nanostructured ZnO film as a hole-conducting layer of organic photovoltaic cell

Hyomin Kim, Yiseul Kwon and Youngson Choe*

Author Affiliations

Department of Chemical Engineering, Pusan National University, Busan 609-735, South Korea

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Nanoscale Research Letters 2013, 8:240  doi:10.1186/1556-276X-8-240

Published: 16 May 2013

Abstract

We have investigated the effect of fibrous nanostructured ZnO film as a hole-conducting layer on the performance of polymer photovoltaic cells. By increasing the concentration of zinc acetate dihydrate, the changes of performance characteristics were evaluated. Fibrous nanostructured ZnO film was prepared by sol-gel process and annealed on a hot plate. As the concentration of zinc acetate dihydrate increased, ZnO fibrous nanostructure grew from 300 to 600 nm. The obtained ZnO nanostructured fibrous films have taken the shape of a maze-like structure and were characterized by UV-visible absorption, scanning electron microscopy, and X-ray diffraction techniques. The intensity of absorption bands in the ultraviolet region was increased with increasing precursor concentration. The X-ray diffraction studies show that the ZnO fibrous nanostructures became strongly (002)-oriented with increasing concentration of precursor. The bulk heterojunction photovoltaic cells were fabricated using poly(3-hexylthiophene-2,5-diyl) and indene-C60 bisadduct as active layer, and their electrical properties were investigated. The external quantum efficiency of the fabricated device increased with increasing precursor concentration.

Keywords:
Electronic materials; Polymers; Vapor deposition; Sol-gel process; ZnO; Nanostructured fibrous film