Deciphering the Effects of Molecular Dipole Moments on the Photovoltaic Performance of Organic Solar Cells

Xiaofei Ji, Ting Wang, Qiang Fu, Dongxue Liu, Ziang Wu, Mingtao Zhang, Han Young Woo, Yongsheng Liu

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The dielectronic constant of organic semiconductor materials is directly related to its molecule dipole moment, which can be used to guide the design of high-performance organic photovoltaic materials. Herein, two isomeric small molecule acceptors, ANDT-2F and CNDT-2F, are designed and synthesized by using the electron localization effect of alkoxy in different positions of naphthalene. It is found that the axisymmetric ANDT-2F exhibits a larger dipole moment, which can improve exciton dissociation and charge generation efficiencies due to the strong intramolecular charge transfer effect, resulting in the higher photovoltaic performance of devices. Moreover, PBDB-T:ANDT-2F blend film exhibits larger and more balanced hole and electron mobility as well as nanoscale phase separation due to the favorable miscibility. As a result, the optimized device based on axisymmetric ANDT-2F shows a JSC of 21.30 mA cm−2, an FF of 66.21%, and a power conversion energy of 12.13%, higher than that of centrosymmetric CNDT-2F-based device. This work provides important implications for designing and synthesizing efficient organic photovoltaic materials by tuning their dipole moment.

Original languageEnglish
Article number2300213
JournalMacromolecular Rapid Communications
Volume44
Issue number23
DOIs
Publication statusPublished - 2023 Dec

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • acceptors
  • dipole moments
  • efficiency
  • energy levels
  • organic solar cells

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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