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International Journal of Photoenergy
Volume 2013 (2013), Article ID 563170, 6 pages
http://dx.doi.org/10.1155/2013/563170
Research Article

A Facile Synthesis of Granular ZnO Nanostructures for Dye-Sensitized Solar Cells

1Department of Advanced Technology Fusion, Konkuk University, Seoul 143-701, Republic of Korea
2Nanotechnology Research Center and Department of Nano Science and Mechanical Engineering, Konkuk University, Chungju 380-701, Republic of Korea
3Nanotechnology Research Center and Department of Applied Chemistry, Konkuk University, Chungju 380-701, Republic of Korea

Received 15 February 2013; Accepted 5 April 2013

Academic Editor: Theodoros Dimopoulos

Copyright © 2013 Md. Mahbubur Rahman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Granular ZnO nanostructures of single-crystalline wurtzite hexagonal phases were synthesized by a facile and low-cost chemical method in aqueous condition. The average size of ZnO nanograin increased with reflux time, and it significantly affected the open circuit potential while the short circuit current density was not changed much. The overall energy conversion efficiency was 1.82% with the smaller grain size of ca. 250 nm when it was used as photoelectrode of DSSCs. The positive shifting of the Fermi energy ( ) and low density of surface states (DOS) were consistent with the reduction of the recombination of excited electron with electrolyte for smaller grains.