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High-sensitivity hybrid MoSe2/AgInGaS quantum dot heterojunction photodetector
Xunjia Zhao1, Xusheng Wang1, Runmeng Jia1
1MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology Nanjing 210094 China xiangchen@njust.edu.cn xiufengsoong@njust.edu.cn.
RSC Advances
|January 10, 2024
Summary
Eco-friendly AgInGaS quantum dots and MoSe2 form a novel hybrid photodetector. This device offers high sensitivity and detectivity, overcoming limitations of toxic elements in traditional photodetectors.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Hybrid photodetectors leverage zero-dimensional (0D) and two-dimensional (2D) materials for enhanced performance.
- Existing high-performance devices often use toxic quantum dots (QDs), limiting their practical use.
- Development of eco-friendly alternatives is crucial for sustainable optoelectronic applications.
Purpose of the Study:
- To develop a high-performance, eco-friendly 0D-2D hybrid photodetector.
- To utilize AgInGaS quantum dots (AIGS-QDs) and molybdenum diselenide (MoSe2) for improved photodetection.
- To investigate the photophysical interactions within the MoSe2/AIGS-QDs heterojunction.
Main Methods:
- Fabrication of a hybrid photodetector using eco-friendly AIGS-QDs as the light-absorbing layer and MoSe2 as the charge transfer layer.
- Characterization of photoluminescence (PL) quenching and decay time in the MoSe2/AIGS-QDs heterojunction.
- Performance evaluation of the hybrid photodetector, including responsivity and detectivity measurements.
Main Results:
- MoSe2 was observed to strongly quench the photoluminescence of AIGS-QDs, reducing PL decay time.
- The MoSe2/AIGS-QDs hybrid photodetector achieved a responsivity of 14.3 A W⁻¹.
- A high detectivity of 6.4 × 10¹¹ Jones was recorded for the hybrid photodetector.
- The detectivity was enhanced over threefold compared to MoSe2-only photodetectors.
Conclusions:
- Eco-friendly AIGS-QDs and MoSe2 can be effectively combined to create high-performance hybrid photodetectors.
- The observed PL quenching indicates efficient charge transfer at the MoSe2/AIGS-QDs interface.
- This work demonstrates the potential of 0D-2D hybrid structures with I-III-VI QDs for advanced, sensitive photodetector applications.
