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Our group is focused on developing solution processed electronic devices and advanced characterization technique on the electronic processes in organic and nano materials.
Key Research Directions
Crystallization and film formation dynamics
In-situ Photoluminescence (PL)
Degradation: Evolution of defects
Sensitive External Quantum Efficiency
Excitonic Properties of Materials
Electroabsorption (EA)
We develop an in situ optical platform to monitor absorption, reflection, and photoluminescence signals during the film formation of perovskites, organic materials, quantum dots, and other solution-processable materials. The molecular aggregation, crystal growth, and compositional evolution revealed by these signals provide insights into the film formation kinetics of these materials, guiding the deposition of high-quality films.
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We developed a highly sensitive external quantum efficiency (s-EQE) technique with high detectivity, enabling the measurement of EQE values as low as 10−7. This capability allows us to detect photocurrent generated by excitation of defect states or charge-transfer (CT) states within the bandgap. The technique helps reveal the evolution of defect states under different operating conditions and provides energetic information on CT states, offering insights into material stabilization and energy transfer processes.
We develop an Electroabsorption (EA) spectroscopy to monitor electric-field-induced changes in the polarizability and dipole moment of excitons in excitonic materials. These properties are closely related to exciton binding, recombination, and charge separation processes. By probing the absorption under an external electric field, EA spectroscopy provides insights into the charge-transfer dynamics and field-dependent photophysical processes in a broad range of excitonic materials.
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