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Improvement in the photoelectrochemical responses of PCBM/TiO2 electrode by electron irradiation

Seung Hwa Yoo1, Jong Min Kum1, Ghafar Ali12, Sung Hwan Heo3 and Sung Oh Cho1*

Author Affiliations

1 Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, South Korea

2 Nanomaterials Research Group, Physics Division, PINSTECH, Islamabad, 45650, Pakistan

3 Particla Co. Ltd., Daejeon, 306-220, South Korea

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Nanoscale Research Letters 2012, 7:142  doi:10.1186/1556-276X-7-142

Published: 20 February 2012


The photoelectrochemical (PEC) responses of electron-irradiated [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/TiO2 electrodes were evaluated in a PEC cell. By coating PCBM on TiO2 nanoparticle film, the light absorption of PCBM/TiO2 electrode has expanded to the visible light region and improved the PEC responses compared to bare TiO2 electrode. The PEC responses were further improved by irradiating an electron beam on PCBM/TiO2 electrodes. Compared to non-irradiated PCBM/TiO2 electrodes, electron irradiation increased the photocurrent density and the open-circuit potential of PEC cells by approximately 90% and approximately 36%, respectively at an optimum electron irradiation condition. The PEC responses are carefully evaluated correlating with the optical and electronic properties of electron-irradiated PCBM/TiO2 electrodes.

photoelectrochemical cell; TiO2; electron irradiation; PCBM; band-edge tuning