En Route to Stable Polymer Solar Cells: Strengthening Morphology of the Active Layer with Br-substituted Crosslinkable Quinoxalines
| Autor: | Yun-Chen Chien, 簡韻宸 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 The active layer of polymer solar cell is composed of a semiconducting polymer (electron donor) and fullerene derivative (electron acceptor). It is widely known that performance of polymer solar cell is largely affected by the nano-scaled morphology of donor polymer and fullerene acceptor. With optimized process, power conversion efficiency had been enhanced to the highest 10.8% reported in 2014. However, it’s still a challenge to be commercialized due to the instability. In order to maintain the peak performance of device for practical application, it’s important to further research and improve morphology stability. In this work, on the purpose of stabilizing morphology of active layer, a synthetic route of fluorinated quinoxaline-based D-A copolymer with primary Br attached on the end of alkyl side chain as crosslink unit had been reported and series of polymer with different percentage of crosslink unit were synthesized via Stille cross coupling. Introducing terminal Br as crosslink to quinoxaline-based polymers unit does not significantly influence photochemical and photophysical properties of polymers. Photocrosslinking reaction was confirmed by solvent resistance tests after exposed to UV. BHJ devices were fabricated in inverted configuration with Br-substituted polymers (PBDT-pTFQ-Br0, PBDT-pTFQ-Br25 and PBDT-pTFQ-Br50) as electron donor and PC71BM as electron acceptor. Photocrosslinking dramatically enhanced the stability of active layer via preventing phase segregation attributed to PC71BM clustering. The stability of device was improved and power conversion efficiency retained after stored under atmosphere without any encapsulation via UV-induced crosslinking reaction. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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