Over 17.6% Efficiency Organic Photovoltaic Devices with Two Compatible Polymer Donors

Chunyu Xu, Xiaoling Ma, Zijin Zhao, Mengyun Jiang, Zhenghao Hu, Jinhua Gao, Zhengqi Deng, Zhengji Zhou*, Qiaoshi An, Jian Zhang*, Fujun Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

Efficient ternary blend organic photovoltaic devices (OPVs) are built based on a D18-Cl:Y6 host system and star polymer donor PM6 as the third component. A power conversion efficiency (PCE) of 16.89% is achieved in D18-Cl:Y6 host binary OPVs, with a short-circuit current density (J SC) of 25.31 mA cm−2, an open-circuit voltage (V OC) of 0.878 V, and a fill factor (FF) of 75.81%. Upon incorporating appropriate PM6 in active layers, the PCE of optimal ternary blend OPVs can be increased to 17.61%, benefiting from a J SC of 26.35 mA cm−2, a V OC of 0.871 V, and an FF of 76.82%. Polymers D18-Cl and PM6 have good compatibility and similar highest occupied molecular orbital (HOMO) levels, which enable to form D18-Cl:PM6 alloyed states for efficient hole transport in ternary blend active layers. Meanwhile, trap density in ternary blend active layers is decreased by incorporating PM6, which is conducive to weaken charge recombination in ternary blend active layers. The gradually varied V OC values of ternary blend OPVs can be well explained from the varied HOMO levels of D18-Cl:PM6 alloyed states. The results indicate that two compatible polymer donors with similar HOMO levels have great potential in achieving efficient ternary blend OPVs.

Original languageEnglish
Article number2100175
JournalSolar RRL
Volume5
Issue number8
DOIs
Publication statusPublished - Aug 2021

Keywords

  • alloyed states
  • compatible polymer donors
  • power conversion efficiency
  • ternary blend organic photovoltaic devices

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