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Published on: February 4, 2017
Optical-cavity-driven photogenerated charge separation revealed by spatiotemporal imaging
Chenwei Ni1,2, Thomas Dittrich3, Jianbo Tang4
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
National Science Review
|August 12, 2026
Summary
Optically resonant cavities enhance charge separation in semiconductors by creating non-uniform light fields. This enables efficient control over charge diffusion for improved solar energy conversion and optoelectronics.
Area of Science:
- Semiconductor physics
- Materials science
- Photocatalysis
Background:
- Efficient photogenerated charge separation is crucial for solar energy conversion.
- Understanding micro- to nanometer-scale charge separation mechanisms is challenging.
Purpose of the Study:
- To investigate charge separation mechanisms in optically resonant cavity structures.
- To demonstrate control over charge separation via optical engineering.
Main Methods:
- Combined surface photovoltage microscopy and optical imaging.
- Spatiotemporal imaging of carrier dynamics from femtoseconds to seconds.
Main Results:
- Optically resonant cavities create non-uniform light fields, driving efficient charge separation.
- Charge separation results from ultrafast hot-electron diffusion and long-lived trap-limited transport.
- Control over charge separation magnitude and direction was achieved through optical structure engineering.
Conclusions:
- Optical-architecture engineering is a viable approach for manipulating diffusion-driven charge separation.
- Findings provide a blueprint for advancing solar energy conversion and optoelectronic technologies.
