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Back-Gated WS2-Enhanced Barium Titanate Phototransistor with Polarization-Controlled UV Responsivity and Enhanced
Rohit Raj Padhi1, Chiranjit Das1, Guo-Hua Feng1,2
1Institute of NanoEngineering and Microsystems, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS Applied Materials & Interfaces
|November 19, 2025
Summary
A novel ultraviolet phototransistor using WS2/BTO heterostructures achieves high performance with low dark current and enhanced UV absorption. This polarization-modulated device shows promise for energy-efficient optical sensing and electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Development of high-performance photodetectors is crucial for advanced optical sensing.
- Ferroelectric materials offer unique properties for modulating electronic devices.
- Tungsten disulfide (WS2) and barium titanate (BTO) are promising materials for optoelectronic applications.
Purpose of the Study:
- To develop a high-performance ultraviolet (UV) phototransistor using a WS2/BTO heterostructure.
- To investigate the effects of ferroelectric polarization on phototransistor performance.
- To assess the potential of this device for energy-efficient UV detection.
Main Methods:
- Fabrication of a WS2/BTO heterostructure in a back-gated ferroelectric field-effect transistor configuration.
- Characterization using UV-vis spectroscopy, Raman spectroscopy, and photocurrent measurements.
- Evaluation of device performance including dark current, responsivity, rise time, and stability.
Main Results:
- Achieved low dark current (12.3 pA) due to polarization-induced carrier modulation.
- Observed a bandgap reduction in the WS2/BTO composite, enhancing UV-vis absorption.
- Demonstrated a significant 28-fold enhancement in photocurrent and a peak responsivity of 38.5 A/W.
- Exhibited a rapid rise time (0.8 s) and high switching ratio (>10^4) with stable operation from 40-80 °C.
Conclusions:
- The WS2/BTO heterostructure enables efficient polarization-modulated UV photodetection.
- The developed phototransistor offers high performance and energy efficiency.
- Potential applications include memory devices, optical sensors, and wearable electronics.
Keywords:
UV photodetectorbarium titanate (BTO)ferroelectric field-effect transistor (FeFET)remanent polarizationresponsivityswitching ratiotungsten disulfide (WS2)
