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Coherent Charge Transfer Reveals a Different Theoretical Limit of Power Conversion Efficiency in Organic Solar Cells.

Author information

Affiliations

  • 1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, P. R. China.
      Authors
    • Xiang TF 1
    • Liu Z 1
    • Zheng T 1
    • Li A 1
    • Wang XF 1
    (5 authors)
  • 2. Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China.
      Authors
    • Yang L 2
    (1 author)
  • 3. Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
      Authors
    • Tamiaki H 3
    • Sasaki SI 3
    (2 authors)

ORCIDs linked to this article

The Journal of Physical Chemistry Letters, 05 Sep 2024, 15(37):9335-9341
https://doi.org/10.1021/acs.jpclett.4c01631 PMID: 39236264 

Abstract 

The hopping charge transfer (CT) theory is used to explain the dynamics of traditional donor-acceptor (D-A) devices in organic solar cells (OSCs). But it is not applicable to the unconventional OSCs inspired by photosynthesis, referred to as Z-devices. In this study, we establish a universal heterojunction CT model in OSCs, based on the reported coherent CT in photosynthesis. Compared to the trade-off between energy loss and charge generation efficiency in the D-A device, we analyze its change in the Z-device. We introduce the "avalanche-like" CT of the Z-device induced by many-body Coulomb interaction and relevant experimental support. Combining with the Shockley-Queisser theory, we evaluate the theory limit power conversion efficiency of a D-A device and a Z-device. The Z-device has the potential to surpass the Shockley-Queisser limit of 33%.

Full text links 

Read article at publisher's site: https://doi.org/10.1021/acs.jpclett.4c01631

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    Funding 

    Funders who supported this work.

    Japan Society for the Promotion of Science (1)

    National Natural Science Foundation of China (2)

    National Postdoctoral Program for Innovative Talents (1)

    Natural Science Foundation of Chongqing Municipality (1)