14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference

Research output: Contribution to journalArticle

Abstract

Although significant improvements have been achieved for organic photovoltaic cells (OPVs), the top-performing devices still show power conversion efficiencies far behind those of commercialized solar cells. One of the main reasons is the large driving force required for separating electron-hole pairs. Here, we demonstrate an efficiency of 14.7% in the single-junction OPV by using a new polymer donor PTO2 and a nonfullerene acceptor IT-4F. The device possesses an efficient charge generation at a low driving force. Ultrafast transient absorption measurements probe the formation of loosely bound charge pairs with extended lifetime that impedes the recombination of charge carriers in the blend. The theoretical studies reveal that the molecular electrostatic potential (ESP) between PTO2 and IT-4F is large, and the induced intermolecular electric field may assist the charge generation. The results suggest OPVs have the potential for further improvement by judicious modulation of ESP.

Details

Authors
Organisations
External organisations
  • Linköping University
  • Institute of Chemistry, Chinese Academy of Sciences
  • University of the Chinese Academy of Sciences
  • Xi'an Jiaotong University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
  • Energy Engineering
Original languageEnglish
Pages (from-to)7743-7750
Number of pages8
JournalJournal of the American Chemical Society
Volume141
Issue number19
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes

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