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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Electrospun TiO2 Nanofibers for Efficient Electron Transport Layers of Inverted Polymer Solar Cells

2012년 2월 16일 16시 46분 36초
MAT.P-1171 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
서요한, 김원배
광주과학기술원 신소재공학부, Korea
Polymer solar cells have some prominent properties because of this device system have some advantages such as simple and cheap processes to make photovoltaic devices from spin-casting and ink-jet method, but polymer-based photovoltaic devices still have lower power conversion efficiency than another photovoltaic devices in spite of these advantages of polymer-based photovoltaic device. One of the major factors of increasing the performance of polymer solar cells is the development of efficient electron transport layer to efficiently deliver electrons separated from excitons toward cathode. In this work, we applied electrospun TiO2 nanofibers on TiO2 buffer layers as an electron transport layer of inverted polymer solar cells. Although TiO2 has good electron acceptability and large band gap, the electron transport layer with thin film structure has confined contact area with polymer layer and limited electron pathways. However, one-dimensional TiO2 nanofibers can provide continuous electron pathways and large interfacial area with P3HT:PCBM blend layer. After characterizing the structural and electronic properties of electrospun TiO2 nanofibers, we fabricated the inverted polymer solar cells using TiO2 nanofibers. Our devices using TiO2 nanofibers have remarkably increased short circuit current, fill factor and power conversion efficiency, comparing to the device without TiO2 nanofibers. These results could explain that electrospun TiO2 nanofibers have suitable morphological and electronic properties for electron transport layer of inverted polymer solar cells. Acknowledgment This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 20110016600 (Mid-career Researcher Program)), the Global Frontier R&D Program on Center for Multiscale Energy System, and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. R15-2008-006-03002-0).