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A generalized Stark effect electromodulation model for extracting excitonic properties in organic semiconductors

Author

Listed:
  • Taili Liu

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong Shenzhen Research Institute)

  • Yishu Foo

    (City University of Hong Kong
    City University of Hong Kong)

  • Juan Antonio Zapien

    (City University of Hong Kong
    City University of Hong Kong)

  • Menglin Li

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong Shenzhen Research Institute)

  • Sai-Wing Tsang

    (City University of Hong Kong
    City University of Hong Kong
    City University of Hong Kong Shenzhen Research Institute)

Abstract

Electromodulation (EM) spectroscopy, a powerful technique to monitor the changes in polarizability p and dipole moment u of materials upon photo-excitation, can bring direct insight into the excitonic properties of materials. However, extracting Δp and Δu from the electromodulation spectrum relies on fitting with optical absorption of the materials where optical effect in different device geometries might introduce large variation in the extracted values. Here, we demonstrate a systematic electromodulation study with various fitting approaches in both commonly adopted reflection and transmission device architectures. Strikingly, we have found that the previously ascribed continuum state threshold from the deviation between the measured and fitting results is questionable. Such deviation is found to be caused by the overlooked optical interference and electrorefraction effect. A generalized electromodulation model is proposed to incorporate the two effects, and the extracted Δp and Δu have excellent consistency in both reflection and transmission modes in all organic film thicknesses.

Suggested Citation

  • Taili Liu & Yishu Foo & Juan Antonio Zapien & Menglin Li & Sai-Wing Tsang, 2019. "A generalized Stark effect electromodulation model for extracting excitonic properties in organic semiconductors," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13081-w
    DOI: 10.1038/s41467-019-13081-w
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    Cited by:

    1. Chiao-Yu Cheng & Nina Krainova & Alyssa N. Brigeman & Ajay Khanna & Sapana Shedge & Christine Isborn & Joel Yuen-Zhou & Noel C. Giebink, 2022. "Molecular polariton electroabsorption," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Sudhi Mahadevan & Taili Liu & Saied Md Pratik & Yuhao Li & Hang Yuen Ho & Shanchao Ouyang & Xinhui Lu & Hin-Lap Yip & Philip C. Y. Chow & Jean-Luc Brédas & Veaceslav Coropceanu & Shu Kong So & Sai-Win, 2024. "Assessing intra- and inter-molecular charge transfer excitations in non-fullerene acceptors using electroabsorption spectroscopy," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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