2D Silicon-Based Semiconductor Si₂ Te₃ toward Broadband Photodetection.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Silicon-based semiconductors have been foundational for over 50 years.
• Two-dimensional (2D) materials offer novel properties for next-generation electronics.
• Silicon-based 2D materials are advantageous for integration with existing silicon technology.

Purpose of the Study:

• To systematically investigate the structural, electrical, and optical properties of 2D silicon telluride (Si₂Te₃).
• To evaluate the potential of Si₂Te₃ as a semiconductor material for optoelectronic applications.
• To characterize the performance of Si₂Te₃-based field-effect transistors (FETs) and photodetectors.

Main Methods:

• Synthesis and characterization of 2D Si₂Te₃.
• Photoluminescence (PL) spectroscopy to analyze intrinsic defects.
• Fabrication and testing of Si₂Te₃-based FETs and photodetectors.
• Broadband spectral response measurements (405-1064 nm).

Main Results:

• Ultrawide photoluminescence spectra (550-1050 nm) indicate intrinsic defects in Si₂Te₃.
• Si₂Te₃-based devices exhibit typical p-type behavior.
• Remarkable broadband spectral response from 405 nm to 1064 nm.
• High photoresponsivity (65 A/W) and detectivity (2.81 × 10¹² Jones) achieved for a 13.5 nm thick photodetector at 405 nm illumination.

Conclusions:

• 2D Si₂Te₃ demonstrates significant potential for optoelectronic applications.
• The material's broadband response and high performance metrics surpass many traditional photodetectors.
• This work is expected to stimulate further research into 2D silicon-based materials for practical optoelectronics.