Impact of S1→S0 internal conversion in betalain-based dye sensitized solar cells
| Autor: | Gotard Burdzinski, Sławomir Wybraniec, Agnieszka Kumorkiewicz, Monika Wendel, Marcin Ziółek |
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| Rok vydání: | 2017 |
| Předmět: |
Process Chemistry and Technology
General Chemical Engineering Photovoltaic system Energy conversion efficiency Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Internal conversion (chemistry) Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Dye-sensitized solar cell chemistry Absorption band Betalain 0210 nano-technology Betanin |
| Zdroj: | Dyes and Pigments. 141:306-315 |
| ISSN: | 0143-7208 |
| DOI: | 10.1016/j.dyepig.2017.02.026 |
| Popis: | Betalains are natural dyes which can be used in non-toxic environmentally friendly dye-sensitized solar cells (DSSC). In this paper we provide results characterizing the performance of DSSC constructed using betanin, 2,17-bidecarboxybetanin, vulgaxanthin I and betanidin-6-O-(6′,6″-di-O-trans-4-coumaroyl)-β-sophoroside, as well from the red beetroot aqueous extract. The photovoltaic parameters of the cells correlate with the results of time-resolved measurements for fully assembled cells. We reveal that insufficient electron injection quantum yield is mainly responsible for the limited sunlight conversion efficiency. In betacyanin-based DSSC, only about 50% of the excited dye molecules inject electrons, while the rest suffer from a dye S1 fast internal conversion process. In betaxanthin-based DSSC, the quantum yield of electron injection is higher (about 70%), but the total sunlight conversion efficiency is smaller due to the blue-shifted absorption band. A probable explanation of the differences in the electron injection quantum yields in the studied dyes is that of different rates of the competing S1→S0 internal conversion processes. |
| Databáze: | OpenAIRE |
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