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Simultaneous Photomultiplication Improvement and Response Acceleration for High-Performance Lateral Polymer
Meihua Shou1, Qinglei Zhang1, Shicheng Xiong1
1Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Luminescence from Molecular Aggregates of Guangdong Province, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China.
Organic photodetectors achieve higher gain and faster response by increasing charge trap ratios in lateral device structures. This breakthrough enhances performance without increasing dark current, paving the way for advanced photodetector technology.
Area of Science:
- Organic electronics
- Photodetector technology
- Materials science
Background:
- Photomultiplication in organic photodetectors is typically limited by charge traps causing slow responses.
- Optimizing photodetector performance is crucial for advanced electronic applications.
Purpose of the Study:
- To investigate simultaneous enhancement of gain and response speed in lateral photodetectors.
- To explore the effect of increasing trap ratio on photodetector performance.
Main Methods:
- Fabrication of lateral photodetectors using silver nanoparticles and PDPPBTT:PC61BM bulk heterojunction.
- Systematic variation of the PC61BM ratio to control trap density.
- Characterization of device gain, response time, dark current, and detectivity.
Main Results:
- Increased PC61BM ratio led to higher gain (12.7 to 19.8) and faster fall time (313.4 to 172.9 ms).
- Lateral structure with long electrode distance facilitated simultaneous performance enhancement.
- High detectivity of 1.7 × 10^12 Jones achieved due to suppressed dark current.
Conclusions:
- Increasing trap ratio in lateral photodetectors simultaneously improves gain and response speed.
- The lateral device architecture is key to overcoming traditional limitations of charge trapping.
- This approach offers a promising pathway for developing high-performance organic photodetectors.
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