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Published on: April 12, 2018
Tailorable Polarity Switching and Optoelectronic Transition in a Gate-Source Integrated 2D Ferroelectric
Lu Qi1, Ming Chen2, Xiaoliang Weng2
1Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center For Intense Laser Application Technology, and College of Engineering Physics, and Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen Technology University, Shenzhen, P. R. China.
This study introduces a novel 2D ferroelectric phototransistor that switches carrier types and enhances optoelectronic performance using only channel voltage. It achieves positive/negative photoconduction switching and optoelectronic transitions at low voltages.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Device Engineering
Background:
- 2D ferroelectric phototransistors regulate optoelectronic properties via ferroelectric polarization.
- These devices hold potential for photodetection, optical storage, and optical communication.
Purpose of the Study:
- To present a novel 2D ferroelectric phototransistor structure with an integrated gate-source electrode.
- To demonstrate carrier type switching and enhanced optoelectronic performance using only channel voltage.
Main Methods:
- Fabrication of an Au/WSe2/CuCrP2S6/graphene phototransistor.
- Application of channel voltage for carrier type switching.
- Investigation of optoelectronic transition mechanisms due to ion migration.
Main Results:
- Achieved positive/negative photoconduction switching at a low channel voltage of 0.75 V.
- Observed an optoelectronic transition around 0.75 V driven by ion migration.
- Demonstrated a three-order-of-magnitude variation in photocurrent decay time due to hole capture/release by Cu-ion vacancies.
Conclusions:
- The novel architecture provides a platform for dynamically tuning 2D semiconductor optoelectronic properties.
- The device enables precise control over photoconduction and optoelectronic transitions.
- This work advances the development of advanced optoelectronic devices based on 2D ferroelectrics.
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