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Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Photoinduced Charge Transfer at the D/A Interfaces of Isomerized DSMAs Regulated through an External Electric Field

Author

  • Huijie Guo
  • Jingping Li
  • Xiaowei Ding
  • Meixia Zhang
  • Tõnu Pullerits
  • Peng Song

Summary, in English

Developing novel organic photovoltaic materials for organic solar cells (OSCs) requires precise characterization of their charge transfer states to optimize the photoinduced charge transfer mechanisms within the photoactive layer. The microscopic photoelectric properties of the S-shaped (DYA-I-S) and O-shaped (DYA-I-O) conformations of dimeric small molecule acceptors (DSMAs) are analyzed through density functional theory (DFT) calculations. The results indicated that the S-shaped conformation of DSMA exhibits significant advantages in planarity, energy gap, reorganization energy (λ), spectral red shift, and oscillator strength (f). Furthermore, D18 is used as a donor to construct the heterojunction interface, and the D18/DYA-I-S interface exhibited charge transfer states originating from different excitation sites. Using Marcus theory, we also explore the influence of the external electric field (Fext) on the photoinduced charge transfer properties of the D18/DSMAs parallel-stacking interfaces. Notably, the D18/DYA-I-S interface exhibits a higher charge separation rate (kCS), with Fext exerting a more pronounced influence on its kCS. This study reveals the impact of molecular conformational isomerization and Fext modulation on the photoinduced charge transfer process, providing valuable insights for optimizing the OSCs performance.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • eSSENCE: The e-Science Collaboration
  • Chemical Physics
  • NanoLund: Centre for Nanoscience

Publishing year

2025

Language

English

Pages

6198-6210

Publication/Series

Journal of Physical Chemistry A

Volume

129

Issue

28

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Chemistry (including Surface- and Colloid Chemistry)

Status

Published

ISBN/ISSN/Other

  • ISSN: 1089-5639