High performance IGZO-based phototransistors by BN/BP interface engineering

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Recent advances in optoelectronics utilize heterojunctions of indium-gallium-zinc oxide (a-IGZO) and 2D van der Waals materials.
• Improvements in the a-IGZO channel itself through heterojunction construction are seldom reported.

Purpose of the Study:

• To investigate the impact of boron nitride (BN)/black phosphorus (BP) interface engineering on a-IGZO phototransistor performance.
• To enhance photoresponse by optimizing carrier dynamics within the a-IGZO channel.

Main Methods:

• Fabrication of a-IGZO phototransistors with an integrated BN/BP interface.
• Analysis of band bending and photo-generated carrier transfer mechanisms at the IGZO/BP interface.
• Characterization of photoresponse, photoresponsivity, and external quantum efficiency.

Main Results:

• Significant suppression of photo-generated carrier recombination in the a-IGZO channel.
• Enhanced photoresponsivity from 0.05 A W^-1 to 0.3 A W^-1 at 447 nm.
• Achieved a maximum external quantum efficiency of 83.4% for the BN/BP decorated IGZO phototransistor.

Conclusions:

• BN/BP interface engineering offers a general strategy for improving oxide-semiconductor based optoelectronic devices.
• Optimized band bending and carrier transfer pathways are crucial for suppressing recombination and boosting device performance.
• This approach demonstrates potential for developing next-generation high-performance phototransistors.