Synthesis and Photoelectric Properties of Low Bandgap Thiophene Copolymers
| Autor: | Ke-ming Chang, 張可明 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In the field of organic solar technology, there are two main problems, the stability of materials and the low power efficiency. By analyzing the power efficiency of organic solar cells, we can infer that efficiency of absorption and charge mobility are the key factors to these two problems. In this study, we focus on coupling carbazole with different low bandgap moieties. By using Suzuki Coupling, we synthesized new conjugated polymers with main chain structures of D-A sequence. It turns out that the copolymer can form a strong intramolecular charge transfer (ICT). We’ve successfully synthesized two new low bandgap copolymers with D-A sequence, PCAMDT and PCAMDP. These two copolymers show us excellent thermal stabilities with decomposition temperature of 320℃and 355℃,respectively.According to UV-Vis absorption spectrum, PCAMDT and PCAMDP own bandgaps at 1.85 eV and 2.22eV,respectively. Electrochemical analysis reveals that the HOMO and LUMO level of PCAMDT are found to be -5.69eV and -3.77eV,repectively, while the HOMO and LUMO level of PCAMDP are -5.87eV and -3.75eV. These properties make PCAMDT and PCAMDP advantageous materials while applied as high absorbing layers of organic solar cells. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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