| 학회 |
한국고분자학회 |
| 학술대회 |
2014년 봄 (04/10 ~ 04/11, 대전 컨벤션센터) |
| 권호 |
39권 1호 |
| 발표분야 |
분자전자 부문위원회 |
| 제목 |
Photooxidation mechanism of PTB7 Revealed by Infrared and X-ray Photoelectron Spectroscopy |
| 초록 |
Recently power conversion efficiencies of Polymer solar cells(PSCs) have reached exceeding 8%. However, their long-term stability is still a remaining issue, especially due to the photooxidation of low-cost low band gap (LBG) polymers. In this work, we investigated the photooxidation of PTB7 that is a representative high performance polymer in PSCs as a function of 1 sun illumination period in air. To study the photooxidation we employed multiple tools of UV-Vis absorption spectroscopy, UPS, infrared spectroscopy and XPS. We observed that formation of carbonyl and sulfone groups gradually increased as the light exposure time lengthened. Moreover, density function theory-calculations allow us to specify photodegraded positions; the degradation of benzene ring moietis in the PTB7 backbone are mainly responsible for the photodegradation and sulfur atoms in the thiophene rings participate partly in the photodegradation. |
| 저자 |
신나라1, 윤영운2, 서동균1, 최종용3, 손해정1, 곽경원4, 주상용1, 김봉수3
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| 소속 |
1한국과학기술(연), 2연세대, 3중앙대, 4한양대 |
| 키워드 |
organic photovoltaics; conjugated polymer; photooxidation
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| E-Mail |
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