Synthesis of Polythiophene Comprising Electron Donor/Acceptor Pendants for Polymer Solor Cells
| Autor: | Chen-Wei Chou, 周承威 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 A series of polythiophene derivatives, composed of electron donating group 3,6- di- tert- butyl- carbazole ( tCz) and electron accepting groups dibenzo - [d] thiazol- 2- ylmethane ( DBT), were synthesized. The resulting polymers can be soluble in common organic solvents, and have good thermal stability. Through changing the ratio of the electron accepting group DBT and the electron-donating group tCz in the conjugated polymer, the electronic properties and energy levels of the conjugated polymer were effectively tuned. A red-shift of UV-vis absorption band was observed for the polythiophene with higher DBT content. AFM results indicated that the introduction of the alkyl-substituted bithiophene ( BT) into the main-chain of conjugated polymer can reduce the side-chain density and further provide free space between side-chains, consequently a better compatibility between Polymer and PC71BM was observed for the blend films. On the other hand, poor compatibility between the polymer and PC71BM was observed for the polythiophene containing higher tCz content, which is not favorable for the charge separation of the exciton. Higher photovoltaic performances were observed for the PT(DBT)1/PC71BM-based PSCs as compared to those of the other copolymer based PSCs. The power conversion efficiency ( PCE) based on the PT(DBT)1 /PC71BM ( w/w = 1:1) blend were 1.29%, open-circuit voltage (Voc) of PSC 0.62 V, short-circuit current ( Jsc) of PSC 6.55 mA cm-2, and fill factor ( FF) of 0.32, respectively. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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