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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)5053-5061
Number of pages9
JournalNano Letters
Volume19
Issue number8
DOIs
StatePublished - 14 Aug 2019

Keywords

  • charge extraction
  • charge transfer
  • energy transfer
  • nonfullerene
  • Organic photovoltaics
  • ternary blend

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