npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Physics: Sae Mulli 2013; 63: 800-805

Published online July 31, 2013 https://doi.org/10.3938/NPSM.63.800

Copyright © New Physics: Sae Mulli.

Efficiency Enhancement in Polymer Solar Cells by Using a Cosolvent Processing Method

K. RHO1, S. H. PARK*1, Y. K. JUNG2

1Department of Physics, Pukyong National University, Busan 609-735, Korea

2Division for Green Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Korea

Correspondence to:

spark@pknu.ac.kr

Abstract

We report an enhancement in device efficiency of polymer solar cells composed of electron-donating regio-regular poly(3-hexylthiophene) (P3HT) and electron-accepting [6,6]-phenyl-C61-butyric acid methylester (PCBM). By using various organic solvents such as chlorobenzene (CB), dichlorobenzene (DCB) and a mixture of both solvents, we investigated morphological changes in the P3HT:PCBM active layer in the solar cells. The UV-vis absorption spectra, current-voltage characteristics and atomic force microscopy images for the P3HT:PCBM films and the devices revealed that adding a small amount of DCB to CB significantly increased the degree of crystallinity in the P3HT:PCBM active layer, resulting in a considerable efficiency enhancement for the device.

Keywords: Organic solar cell, P3HT, PCBM, Solvent effect, Cosolvent

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