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Direct Interfacial Charge Transfer in All-Polymer Donor-Acceptor Heterojunctions.
Chenglai Wang1,2, Yuancheng Jing1,2, Liying Chen1,2
1Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States.
The Journal of Physical Chemistry Letters
|September 12, 2022
Summary
Direct charge transfer occurs at wet-processed organic interfaces, confirmed by spectroscopy. This finding supports ground-state charge transfer and opens avenues for spintronic applications by controlling charge transfer at organic material interfaces.
Area of Science:
- Organic electronics
- Materials science
- Spectroscopy
Background:
- Organic/organic heterojunctions are crucial for electronic devices.
- Understanding interfacial charge transfer is key to device performance.
Purpose of the Study:
- To investigate direct charge transfer at wet-processed organic/organic heterojunctions.
- To characterize the interfacial energy gap and transient electric fields.
Main Methods:
- Femtosecond interfacial sensitive spectroscopy.
- UV-vis absorption spectroscopy.
- Ultraviolet photoelectron spectroscopy.
Main Results:
- Direct charge transfer observed at wet-processed organic/organic interfaces.
- A new interfacial energy gap of ~1.2 eV was identified.
- Evidence of a transient electric field due to separated charges was detected.
Conclusions:
- Direct charge transfer is confirmed at wet-processed organic interfaces.
- This provides a physical basis for ground-state charge transfer phenomena.
- Enables new strategies for controlling charge transfer in organic materials for spintronics.
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