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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Breaking the Photoabsorption-Relaxation Trade-Off: Flat-Band Engineering for Efficient Photothermal Conversion
Chao Ge1, Qiyuan Xie1,2, Jinke Jiang3
1School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 17, 2026
Summary
Researchers developed novel organic cocrystals for efficient solar energy conversion. By combining flat-band and indirect-gap electronic structures, these materials achieve broadband absorption and high photothermal conversion, overcoming previous limitations in light-heat conversion materials.
Area of Science:
- Materials Science
- Photochemistry
- Organic Electronics
Background:
- Organic cocrystals show promise for photothermal applications due to efficient light-heat conversion.
- A key challenge is balancing strong light absorption with rapid nonradiative decay.
Purpose of the Study:
- To investigate electronic structures and photoexcited-state dynamics of charge-transfer cocrystals (coronene-FxTCNQ).
- To establish a design strategy for overcoming the absorption-decay trade-off in photothermal cocrystals.
Main Methods:
- Theoretical analysis of electronic structures.
- Ultrafast spectroscopy to study photoexcited-state dynamics.
- Fabrication and testing of coronene-FxTCNQ cocrystals (x = 0, 2, 4).
Main Results:
- A synergistic electronic configuration (flat-band with indirect-gap) was established.
- Broadband absorption up to 2500 nm and peak photothermal conversion of 73% were achieved.
- Enhanced joint densities of states and modified transition rules were identified for phonon-assisted conversion.
Conclusions:
- The proposed design strategy effectively overcomes the absorption-decay trade-off.
- Demonstrated applications in solar desalination, sewage purification, and photo-thermoelectric conversion achieved high solar utilization efficiency (96.6%).
- Provides a rational guideline for designing advanced cocrystal photothermal materials.
