Evaluation on over photocurrents measured from unmasked dye-sensitized solar cells
- Solar Cell Research Center, Materials Science and Technology Division, Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea)
- Department of Material Engineering, Korea University, Seoul 136-701 (Korea)
We have investigated the change in photocurrent density (J{sub SC}) of dye-sensitized solar cell (DSSC) before and after covering an aperture mask on the cell, especially its dependence on solar absorption range in dye. Four different dyes having absorption threshold at 460 nm (P5), 520 nm (TA-St-CA), 680 nm (N719) and 820 nm (N749) are tested. J{sub SC} of the DSSC without mask decreases after mask, where the decreasing rate (triangle J{sub SC} = J{sub SC} (no mask) -J{sub SC} (with mask)/J{sub SC} (no mask)) becomes larger when dye absorption threshold decreases. triangle J{sub SC} at the given TiO{sub 2} film thickness of 10 {mu}m is determined to be about 20%, 15% and 13% for P5, TA-St-CA and N719-N749, respectively, which is reduced to 14% (TA-St-CA), 11.3% (N719) and 10.5% (N749) after increasing the thickness to 20 {mu}m, except for P5 dye remaining unchanged. According to the analysis based on IPCE and photon flux data, the over photocurrents observed for the unmasked dye-sensitized solar cells and their dependence on dye absorption range are found to be attributed to diffuse light leaving the dye-adsorbed TiO{sub 2} active area. (author)
- OSTI ID:
- 21305694
- Journal Information:
- Solar Energy, Vol. 84, Issue 3; Other Information: Elsevier Ltd. All rights reserved; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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