| 학회 |
한국고분자학회 |
| 학술대회 |
2009년 가을 (10/08 ~ 10/09, 광주과학기술원 오룡관) |
| 권호 |
34권 2호 |
| 발표분야 |
에너지변환 및 저장시스템(분자전자 부문위원회) |
| 제목 |
Performance Enhancement of Organic Solar Cells by Energy Level Matching of Three Photon-Harvesting Layers |
| 초록 |
An approach to increase light absorption efficiency of organic solar cells is the use of multilayered photoactive-materials. Here, we demonstrate a method to enhance both the open-circuit voltage(Voc) and short-circuit current density(Jsc) of the device by matching the energy levels of three photon-harvesting layers with different absorption spectra. We used pentacene, phthalocyanine, C70 as the photon-harvesting materials so that the highest occupied molecular orbital(HOMO) and lowest unoccupied molecular orbital(LUMO) levels of the materials form a cascade energy band structure and the band offsets at all interfaces in the photoactive layer are large. The enhancement of the Voc is ascribed to the large energy difference between the HOMO level of the phthalocyaine and LUMO level of C70. The Jsc improvement results from the contribution of additionally-generated exctions in the phthalocyanine layer to the photocurent. |
| 저자 |
심명선, 김종수, 이지황, 박종환, 김주현, 심치영, 조길원
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| 소속 |
포항공대 |
| 키워드 |
Three photon-harvesting layer; energy level; organic solar cells
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| E-Mail |
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