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High-Performance Multifunctional Photodetector and THz Modulator Based on Graphene/TiO₂/p-Si Heterojunction.

Miaoqing Wei¹, Dainan Zhang^1,2, Lei Zhang¹

¹School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu, 611731, China.

Nanoscale Research Letters

|August 21, 2021

Summary

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This summary is machine-generated.

This study presents a graphene/TiO2/p-Si heterojunction device for optical detection and terahertz modulation. The device exhibits high responsivity and detectability, with tunable terahertz wave modulation under negative bias.

Area of Science:

Materials Science
Optoelectronics
Semiconductor Physics

Background:

Graphene and titanium dioxide (TiO2) are advanced materials with unique electronic and optical properties.
Heterojunction devices offer versatile functionalities by combining different semiconductor materials.
Terahertz (THz) technology is crucial for advanced imaging, sensing, and communication systems.

Purpose of the Study:

To develop and analyze a multifunctional graphene/TiO2/p-Si heterojunction device.
To investigate the device's optical response across ultraviolet-visible-infrared spectrum.
To evaluate the terahertz wave transmission modulation capabilities under varying bias voltages.

Main Methods:

Fabrication of a graphene/TiO2/p-Si heterojunction device.

Keywords:

Broadband THz wave modulator Graphene/TiO2/p-Si Multifunctional device Photodetector

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Systematic optical response analysis under UV-Vis-IR illumination.

Measurement of terahertz wave transmission changes (0.3-1.0 THz) under different bias conditions.

Main Results:

The photodetector demonstrated high responsivity (3.6 A/W) and detectability (4×10^13 Jones) at 750 nm due to unbalanced photogenerated carrier distribution.
The TiO2 layer enabled terahertz wave modulation, achieving a 23% modulation depth under -15 V bias.
Terahertz wave transmission was significantly altered by negative bias, similar to a semiconductor diode's behavior.

Conclusions:

The graphene/TiO2/p-Si heterojunction is a promising multifunctional optoelectronic device.
The device exhibits excellent performance as a photodetector and a tunable terahertz modulator.
The asymmetric response to bias voltage in terahertz modulation opens possibilities for diode-like THz applications.