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Order enables efficient electron-hole separation at an organic heterojunction with a small energy loss

Author

Listed:
  • S. Matthew Menke

    (University of Cambridge)

  • Alexandre Cheminal

    (University of Cambridge)

  • Patrick Conaghan

    (University of Cambridge)

  • Niva A. Ran

    (University of California, Santa Barbara)

  • Neil C. Greehnam

    (University of Cambridge)

  • Guillermo C. Bazan

    (University of California, Santa Barbara)

  • Thuc-Quyen Nguyen

    (University of California, Santa Barbara)

  • Akshay Rao

    (University of Cambridge)

  • Richard H. Friend

    (University of Cambridge)

Abstract

Donor–acceptor organic solar cells often show low open-circuit voltages (V OC) relative to their optical energy gap (E g) that limit power conversion efficiencies to ~12%. This energy loss is partly attributed to the offset between E g and that of intermolecular charge transfer (CT) states at the donor–acceptor interface. Here we study charge generation occurring in PIPCP:PC61BM, a system with a very low driving energy for initial charge separation (E g−E CT ~ 50 meV) and a high internal quantum efficiency (η IQE ~ 80%). We track the strength of the electric field generated between the separating electron-hole pair by following the transient electroabsorption optical response, and find that while localised CT states are formed rapidly (

Suggested Citation

  • S. Matthew Menke & Alexandre Cheminal & Patrick Conaghan & Niva A. Ran & Neil C. Greehnam & Guillermo C. Bazan & Thuc-Quyen Nguyen & Akshay Rao & Richard H. Friend, 2018. "Order enables efficient electron-hole separation at an organic heterojunction with a small energy loss," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02457-5
    DOI: 10.1038/s41467-017-02457-5
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    Cited by:

    1. Marios Maimaris & Allan J. Pettipher & Mohammed Azzouzi & Daniel J. Walke & Xijia Zheng & Andrei Gorodetsky & Yifan Dong & Pabitra Shakya Tuladhar & Helder Crespo & Jenny Nelson & John W. G. Tisch & A, 2022. "Sub-10-fs observation of bound exciton formation in organic optoelectronic devices," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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