https://scholars.lib.ntu.edu.tw/handle/123456789/387673
標題: | Bridging donor-acceptor energy offset using organic dopants as energy ladders to improve open-circuit voltages in bulk-heterojunction solar cells | 作者: | CHIH-I WU Chang, J.-K. Kuo, Y.-C. Chen, Y.-J. Lo, A.-L. Liu, I.-H. Tseng, W.-H. Wu, K.-H. Chen, M.-H. CHIH-I WU |
關鍵字: | Open-circuit voltage; Organic photovoltaics; Ternary cascade energy alignment | 公開日期: | 2014 | 卷: | 15 | 期: | 12 | 起(迄)頁: | 3458-3464 | 來源出版物: | Organic Electronics: physics, materials, applications | 摘要: | A systematic way to improve the open circuit voltage of bulk-heterojunction (BHJ) organic photovoltaics is demonstrated by incorporating energy ladder material to form a ternary blend with cascade energy structures. We propose that doping organic molecules with appropriate energetic alignment to bridge the donor-acceptor energy offset can facilitate exciton dissociation and hence improve open-circuit voltage (Voc) and power conversion efficiency. The cascade energy alignment structure is measured via ultraviolet photoemission spectroscopy. The Voc and power conversion efficiency of devices using the proposed schemes can be enhanced by 10% and 20%, respectively. The results provide a new path toward higher power conversion efficiency in BHJ systems by engineering the energy structures of the materials in the active layers. © 2014 Elsevier B.V. All rights reserved. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84949117273&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/387673 |
DOI: | 10.1016/j.orgel.2014.08.052 | SDG/關鍵字: | Alignment; Conversion efficiency; Doping (additives); Heterojunctions; Ladders; Open circuit voltage; Photoelectron spectroscopy; Solar cells; Timing circuits; Alignment structure; Bulk heterojunction (BHJ); Bulk heterojunction solar cells; Energy structures; Exciton dissociation; Organic photovoltaics; Power conversion efficiencies; Ultraviolet photoemission spectroscopy; Energy efficiency |
顯示於: | 光電工程學研究所 |
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