The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Regulation of organic solar cells performance through external electric field : From charge transfer mechanisms to photovoltaic properties

Author

  • Huijie Guo
  • Xinyue Wang
  • Meixia Zhang
  • Tõnu Pullerits
  • Peng Song

Summary, in English

In organic solar cells (OSCs), comprehending the charge transfer mechanism at D/A interfaces is crucial for photoinduced charge generation and enhancing power conversion efficiency (PCE). The charge transfer mechanism and photovoltaic performance of the parallel stacking interface configuration of the PTQ10 polymer donor and T2EH non-fullerene acceptor (NFA) are systematically studied at the microscopic scale. The analysis of the electron-hole distribution of the PTQ10/T2EH excited states revealed the presence of multiple charge excitation modes and charge transfer pathways. Using Marcus theory, we examine the charge separation rate (KCS) of PTQ10/T2EH under external electric field (Fext) modulation, and it is clarified that reorganization energy (λ) is the main factor that affects the KCS. Our results show that Fext has a positive impact on the photovoltaic properties of PTQ10/T2EH thin films, as evidenced by the modulation of the open circuit voltage (VOC), voltage loss (VLOSS) and fill factor (FF). Overall, this study provides valuable theoretical insights for Fext to accelerate the charge separation process and enhance photovoltaic efficiency.

Department/s

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

Publishing year

2025-01

Language

English

Publication/Series

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

Volume

325

Document type

Journal article

Publisher

Elsevier

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • Charge transfer mechanisms
  • External electric field
  • Organic solar cells
  • Photovoltaic properties

Status

Published

ISBN/ISSN/Other

  • ISSN: 1386-1425