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Pyridinium molten salts as co-adsorbents in dye-sensitized solar cells |
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| Authors: | Jui-Cheng Chang Hao-Hsun Yang Wen-Yueh Ho Jia-Yaw Chang |
| Affiliation: | a Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan b Nano-Powder and Thin Film Technology Center, ITRI South, Tainan 709, Taiwan c Institute of Cosmetic Science, Chia Nan University of Pharmacy & Science, Tainan 717, Taiwan d Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan |
| Abstract: | The influence of using pyridinium molten salts as co-adsorbents to modify the monolayer of a TiO2 semiconductor on the performance of a dye-sensitized solar cell is studied. The current-voltage characteristics are measured under AM 1.5 (100 mW cm−2). The pyridinium molten salts significantly enhance the open-circuit photovoltage (Voc), the short circuit photocurrent density (Jsc) as well as the solar energy conversion efficiency (η). 1-Ethyl-3-carboxypyridinium iodide ([ECP][I]) is applied successfully to prepare an insulating molecular layer with N719, and achieve high energy conversion efficiency as high as 4.49% at 100 mW cm−2 and AM 1.5. The resulting efficiency is 20% higher than that of a non-additive device. This enhancement of conversion efficiency is attributed to the negative shift of the conduction band (CB) edge and the abundant concentration of I− on the surface of the electrode when using [ECP][I] as the co-adsorbent. |
| Keywords: | Dye-sensitized solar cell Co-adsorbent Insulating molecular layer |
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