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Vol.53, No.5, 365 ~ 370, 2015
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| Title |
| A Research on Improvement of Hydrogen Generation using CdS/CIGS Photo-Electrode in Photoelectrochemical System |
| 고영희 Young Hee Ko , 박광훈 Gwang Hun Park , 김은숙 Eun Sook Kim , 배효정 Hyo Jung Bae , 고항주 Hang Ju Ko , 하준석 Jun Seok Ha |
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| Abstract |
| We investigated the photoelectrochemical (PEC) properties of CdS/CIGS thin films as the hydrogengenerating photo-electrode in Na2SO4 electrolyte. The onset potential of CIGS of thin film by itself which is a point of beginning redox reaction for hydrogen generation was .0.6 V under illumination of 200 mW. However, with the deposition of CdS layer on CIGS film, CdS/CIGS structures produced three times enhanced photocurrents at .0.1 V vs compared with only CIGS thin film. CdS layer has ideal band-gap energy and position for redox reaction under visible light irradiation. Also, CdS layer could make P-N junction with CIGS film and form stepwise band-gap structure, which help electrons and holes transfer more easily. From these results, CdS/CIGS thin films could be regarded as a promising photo-electrode cell structure for hydrogen generation. |
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| Key Words |
| photoelectrochemisty, PEC, photoelectrode, hydrogen generation, CdS, CIGS |
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