標題: Realizing Efficient Charge/Energy Transfer and Charge Extraction in Fullerene-Free Organic Photovoltaics via a Versatile Third Component
作者: Cheng, Hao-Wen
Zhang, Huotian
Lin, Yu-Che
She, Nian-Zu
Wang, Rui
Chen, Chung-Hao
Yuan, Jun
Tsao, Cheng-Si
Yabushita, Atsushi
Zou, Yingping
Gao, Feng
Cheng, Pei
Wei, Kung-Hwa
Yang, Yang
交大名義發表
電子物理學系
National Chiao Tung University
Department of Electrophysics
關鍵字: Organic photovoltaics;nonfullerene;ternary blend;charge transfer;energy transfer;charge extraction
公開日期: 1-Aug-2019
摘要: Solution-processed organic photovoltaics (OPVs) based on bulk-heterojunctions have gained significant attention to alleviate the increasing demend of fossil fuel in the past two decades. OPVs combined of a wide bandgap polymer donor and a narrow bandgap nonfullerene acceptor show potential to achieve high performance. However, there are still two reasons to limit the OPVs performance. One, although this combination can expand from the ultraviolet to the near-infrared region, the overall external quantum efficiency of the device suffers low values. The other one is the low open-circuit voltage (V-OC) of devices resulting from the relatively downshifted lowest unoccupied molecular orbital (LUMO) of the narrow bandgap. Herein, the approach to select and incorporate a versatile third component into the active layer is reported. A third component with a bandgap larger than that of the acceptor, and absorption spectra and LUMO levels lying within that of the donor and acceptor, is demonstrated to be effective to conquer these issues. As a result, the power conversion efficiencies (PCEs) are enhanced by the elevated short-circuit current and V-OC; the champion PCEs are 11.1% and 13.1% for PTB7-Th:IEICO-4F based and PBDB-T:Y1 based solar cells, respectively.
URI: http://dx.doi.org/10.1021/acs.nanolett.9b01344
http://hdl.handle.net/11536/152637
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.9b01344
期刊: NANO LETTERS
Volume: 19
Issue: 8
起始頁: 5053
結束頁: 5061
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