Synthesis and Photovoltaic Properties of Star Shaped Molecules with Strong Electron-Donor and Electron-Acceptor Groups
| Autor: | Yu-Wen Kao, 高郁雯 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 In this study, the star-shaped molecules (TPATT, TPACA, and TPADTA) with D-π-A conjugated structure based on a triphenylamine core, thienylenevinylene conjugated branches, and electron-withdrawing 2-ethylhexyl cyanoacetate or 1,3-dietyl-2-thiobarbituric acid group were synthesized and used as a donor for bulk heterojunction photovoltaic devices. The maximal absorption wavelengths of TPATT, TPACA, and TPADTA were observed at 444, 506, and 571 nm, respectively. A series of bulk heterojunction solar cells based on the active layer of TPATT/PC61BM, TPACA/PC61BM, and TPADTA/PC61BM blends were fabricated. The power conversion efficiency (PCE) was strongly dependent on the composition of the blends. The PCE values of TPATT/PC61BM based solar cells were larger than those of TPACA/PC61BM and TPADTA/PC61BM based solar cells. A power conversion efficiency of 0.63 %, a short-circuit current density of 2.73 mA/cm2, an open-circuit voltage of 0.64 V, and a fill factor of 0.37 were observed for solar cell based on the active layer of TPATT/PC61BM (1:3, w/w). |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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