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Efficient Exciton Dissociation in Heterojunction Interfaces Realizing Enhanced Photoresponsive Performance
Wei Shao1, Li Wang1, Hui Wang1
1Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics , University of Science and Technology of China , Hefei , Anhui 230026 , People's Republic of China.
The Journal of Physical Chemistry Letters
|May 16, 2019
Summary
Constructing a heterojunction in black phosphorus nanosheets/poly(3-hexylthiophene) (BP/P3HT) enhances exciton dissociation for efficient photoresponse. This strategy significantly boosts photocurrent on-off ratios in low-dimensional materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Excitonic effects, arising from charge carrier interactions, significantly impact the photoresponsive properties of low-dimensional materials.
- Efficient photoresponse necessitates strategies to promote exciton dissociation in these systems.
Purpose of the Study:
- To investigate the potential of heterojunction construction for facilitating exciton dissociation.
- To explore the role of band alignment and transport properties in enhancing photoresponse.
Main Methods:
- Fabrication of black phosphorus nanosheets/poly(3-hexylthiophene) (BP/P3HT) heterojunctions.
- Analysis of band structures and carrier kinetics.
- Measurement of photocurrent on-off ratios.
Main Results:
- Confirmed directional hole injection from BP to P3HT.
- Demonstrated excellent hole transport properties in P3HT within the heterojunction.
- Achieved a high photocurrent on-off ratio of ~18.3 for the BP/P3HT heterojunction.
Conclusions:
- Heterojunction engineering with specific band alignment and transport properties effectively promotes exciton dissociation.
- The BP/P3HT heterojunction presents a viable model for exciton regulation in photoresponsive devices.
- This study deepens the understanding of exciton dissociation mechanisms in low-dimensional materials.
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