Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6: Y6-1O as acceptor

Xiaoling Ma, Anping Zeng, Jinhua Gao, Zhenghao Hu, Chunyu Xu, Jae Hoon Son, Sang Young Jeong, Caixia Zhang, Mengyang Li, Kai Wang, He Yan, Zaifei Ma, Yongsheng Wang, Han Young Woo, Fujun Zhang

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

a series of ternary organic photovoltaics (OPVs) are fabricated with one wide bandgap polymer D18-Cl as donor, and well compatible Y6 and Y6-1O as acceptor. The open-circuit-voltage (VOC) of ternary OPVs is monotonously increased along with the incorporation of Y6-1O, indicating that the alloy state should be formed between Y6 and Y6-1O due to their excellent compatibility. The energy loss can be minimized by incorporating Y6-1O, leading to the VOC improvement of ternary OPVs. By finely adjusting the Y6-1O content, a power conversion efficiency of 17.91% is achieved in the optimal ternary OPVs with 30 wt% Y6-1O in acceptors, resulting from synchronously improved short-circuit-current density (JSC) of 25.87 ma cm-2, fill factor (FF) of 76.92% and VOC of 0.900 V in comparison with those of D18-Cl: Y6 binary OPVs. The JSC and FF improvement of ternary OPVs should be ascribed to comprehensively optimal photon harvesting, exciton dissociation and charge transport in ternary active layers. The more efficient charge separation and transport process in ternary active layers can be confirmed by the magneto-photocurrent and impedance spectroscopy experimental results, respectively. This work provides new insight into constructing highly efficient ternary OPVs with well compatible Y6 and its derivative as acceptor.

Original languageEnglish
Article numbernwaa305
JournalNational Science Review
Volume8
Issue number8
DOIs
Publication statusPublished - 2021 Aug 1
Externally publishedYes

Keywords

  • morphology regulation
  • organic photovoltaics
  • photon harvesting
  • power conversion efficiency
  • ternary strategy

ASJC Scopus subject areas

  • General

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