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Electrically Tunable Multiple-Effects Synergistic and Boosted Photoelectric Performance in Te/WSe2 Mixed-Dimensional
Hechun Cao1,2, Tao Hu1,2, Jiyue Zhang1
1Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 19, 2024
Summary
Researchers developed tunable Te/WSe2 mix-dimensional heterojunctions (MDHJs) phototransistors. These devices exhibit enhanced sensitivity and function as artificial bionic visual systems, paving the way for intelligent optoelectronic sensors.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Mix-dimensional heterojunctions (MDHJs) are crucial for advanced optoelectronic sensors.
- Achieving synergistic effects in MDHJs for enhanced sensitivity remains a challenge.
- Artificial bionic systems require sensitive and multifunctional photodetectors.
Purpose of the Study:
- To construct electrically tunable Te/WSe2 MDHJs phototransistors.
- To investigate the synergistic effects of photoconductive, photovoltaic, and photo-thermoelectric conversions.
- To demonstrate the potential of these MDHJs for artificial bionic visual systems.
Main Methods:
- Fabrication of Te/WSe2 heterostructures.
- Electrical tuning of gate and bias.
- Characterization of photodetector performance, including dark current, on/off ratio, responsivity, and detectivity.
- Evaluation of response time for bionic system applications.
Main Results:
- Achieved ultralow dark current (<0.1 pA) and a high on/off rectification ratio (10^6).
- Demonstrated simultaneous photoconductive, photovoltaic, and photo-thermoelectric conversions.
- Obtained high responsivity (13.9 A/W) and detectivity (1.37 × 10^12 Jones) with a 400-fold increase.
- Exhibited response times comparable to the human visual system, with transient positive and negative signals.
Conclusions:
- Electrically tunable Te/WSe2 MDHJs offer a promising platform for high-performance photodetectors.
- The synergistic interplay of multiple conversion mechanisms significantly boosts device sensitivity.
- These MDHJs show potential for developing intelligent optoelectronic devices and artificial bionic visual systems.
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