Realizing Efficient Charge/Energy Transfer and Charge Extraction in Fullerene-Free Organic Photovoltaics via a Versatile Third Component

Hao Wen Cheng, Huotian Zhang, Yu Che Lin, Nian Zu She, Rui Wang, Chung Hao Chen, Jun Yuan, Cheng Si Tsao, Atsushi Yabushita, Yingping Zou, Feng Gao, Pei Cheng, Kung-Hwa Wei*, Yang Yang

*此作品的通信作者

研究成果: Article同行評審

45 引文 斯高帕斯(Scopus)

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 (VOC) 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 VOC; the champion PCEs are 11.1% and 13.1% for PTB7-Th:IEICO-4F based and PBDB-T:Y1 based solar cells, respectively.

原文English
頁(從 - 到)5053-5061
頁數9
期刊Nano letters
19
發行號8
DOIs
出版狀態Published - 7月 2019

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