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Passivated Interfacial Traps of Monolayer MoS2 with Bipolar Electrical Pulse
Po-Han Chen1, Chun-An Chen1, Yu-Ting Lin1,2
1Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS Applied Materials & Interfaces
|February 21, 2023
Summary
Researchers improved the speed of monolayer photodetectors by addressing interfacial traps. This breakthrough enhances the performance of stacked two-dimensional materials for faster, high-gain electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Heterogeneous integration of monolayers enables novel material combinations for advanced properties.
- Manipulating interfacial configurations in stacked architectures remains a key challenge.
- Transition metal dichalcogenides (TMDs) monolayers are crucial for studying interface engineering due to optoelectronic performance trade-offs caused by interfacial trap states.
Purpose of the Study:
- To investigate the fundamental processes of photoresponse excitation and relaxation in monolayer molybdenum disulfide (MoS2).
- To correlate these processes with interfacial traps and understand the mechanism behind saturation photocurrent and reset behavior.
- To demonstrate a method for reducing response time in monolayer photodetectors.
Main Methods:
- Studied fundamental processes in excitation and relaxation of photoresponse in monolayer MoS2.
- Analyzed device performances to illustrate mechanisms of saturation photocurrent and reset behavior.
- Employed electrostatic passivation using bipolar gate pulses to mitigate interfacial traps.
Main Results:
- Identified fundamental processes governing photoresponse in monolayer MoS2.
- Illustrated the mechanism for saturation photocurrent and reset behavior.
- Achieved significant reduction in response time through electrostatic passivation of interfacial traps.
Conclusions:
- Interfacial trap states significantly impact the photoresponse dynamics of monolayer MoS2.
- Electrostatic passivation effectively reduces response time, enabling faster photocurrent saturation.
- This work advances the development of high-speed, ultrahigh-gain devices based on stacked 2D monolayers.
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