Ex) Article Title, Author, Keywords
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.
K. RHO1, S. H. PARK*1, Y. K. JUNG2
1Department of Physics, Pukyong National University, Busan 609-735, Korea
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