Performance of P3HT/C₇₀-PCBM Polymer Photovoltaic Devices According to Manufacturing Conditions

Abstract

In order to improve the P3HT/PCBM polymer photovoltaic devices, C₇₀-PCBM ([6,6]-phenyl C₇₁-butyric acid methyl ester) was employed instead of C₆₀-PCBM ([6,6]-phenyl C₆₁-butyric acid methyl ester). C₇₀-PCBM showed significant increase of visible region light absorption to enhance the photocurrent. To optimize the device performance, we changed the device fabrication conditions such as atmosphere, solvents, post-annealing time, active layer materials composition, and thickness. The best power conversion efficiency of 4.7% was achieved under AM 1.5 G, 75 mA/cm² condition.

Keywords:

• C₇₀-PCBM
• organic solar cell
• polymer photovoltaic device

Acknowledgments

This research was supported by the Korea Materials & Components Industry Agency (KMAC) (Grant: M200701004) and the Korea Research Institute of Chemical Technology (KRICT) (Grant: BS. F-0701). Authors also thank Dr. B. Vijaya Kumar Naidu for the kind discussion.