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Design Strategy for Improving Detection Sensitivity in a Bromoplumbate Photochromic Semiconductor
Qiu-Pei Qin1,2, Jian Lu1, Cai Sun1,3
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350608, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 15, 2023
Summary
This study introduces a novel single-component photochromic semiconductor that significantly enhances photodetector sensitivity by reducing dark current. The material achieves a 14.6-fold conductivity drop upon UV irradiation, doubling photodetection sensitivity.
Area of Science:
- Materials Science
- Semiconductor Physics
- Optoelectronics
Background:
- Reducing photodetector dark current is crucial for sensitivity but often costly.
- Existing methods require complex material control and interface processing.
Purpose of the Study:
- To develop a cost-effective single-component photochromic semiconductor for enhanced photodetector sensitivity.
- To investigate the mechanism behind conductivity reduction upon photochromism.
Main Methods:
- Synthesized a new single-component photochromic semiconductor: [(HDMA)4(Pb3Br10)(PhSQ)2]n.
- Incorporated a redox-active monosubstituted viologen zwitterion into an inorganic semiconducting framework.
- Characterized photochromic and electrical properties before and after UV irradiation.
Main Results:
- The material exhibits yellow-to-green photochromism under UV light.
- Intrinsic conductivity decreased by a factor of 14.6 after UV exposure.
- Photodetection sensitivity gain was successfully doubled.
Conclusions:
- The conductivity decrease is attributed to an increased band gap and Frenkel exciton formation.
- This approach offers a promising strategy for high-sensitivity photodetector development.
- The single-component design simplifies manufacturing and reduces costs.
