Important role of alloyed polymer acceptor for high efficiency and stable large-area organic photovoltaics

Sungmin Park, So Hyun Park, Hyunjung Jin, Seongwon Yoon, Hyungju Ahn, Seoeun Shin, Kyungwon Kwak, Sanghee Nah, Eul Yong Shin, Jun Hong Noh, Byoung Koun Min, Hae Jung Son

Research output: Contribution to journalArticlepeer-review

Abstract

We developed high performance PM6:N3 bulk-heterojunctions by synthesizing polymers as the second acceptor. The acceptor PY-P2 where a biphenyl linker makes the polymer chain to have high dihedral angles forms intricate alloy-like composites in N3 domains whereas stiff polymer chain of PY-T2 exists separated from the acceptor domain. Introduction of PY-P2 results in much longer lifetimes and diffusion lengths of excitons generated in N3 domain of the PM6:N3:PY-P2 blend compared to those of the excitons in PM6:N3 as well as PM6:N3:PY-T2. Consequently, the PM6:N3:PY-P2 based OPV devices show improved exciton dissociation and change transport with reduced charge recombination. The PM6:N3:PY-P2 organic photovoltaic (OPV) devices prepared with blade-coating at 1 cm2 active area achieved efficiency of 15.2% compared with 12.9% of the PM6:N3 control device; whereas, the corresponding OPV device using PY-T2 shows decreased efficiency of 11.7%. OPV mini-module (active area 5.4 cm2) with PY-P2 achieves high efficiency of 14.7% compared with 11.9% of the PM6:N3 devices. Furthermore, the alloyed PY-P2 acceptor effectively improves OPV thermal stability under 85 °C heating for 1000 h, compared with PY-T2 and control devices. We demonstrated importance of the second polymer acceptor for achieving high-performance large-area OPV, which is significantly affected by its chemical structure.

Original languageEnglish
Article number107187
JournalNano Energy
Volume98
DOIs
Publication statusPublished - 2022 Jul

Keywords

  • Alloyed polymer acceptors
  • Bulk-heterojunctions
  • High-performances
  • Large-area modules
  • Organic photovoltaics

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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