Lattice-mismatched semiconductor heterostructures

TL;DR

This paper introduces an ultra-thin oxide-interfaced method for creating lattice-mismatched semiconductor heterostructures, overcoming longstanding challenges and enabling high-performance electronic and optoelectronic devices with diverse material combinations.

Contribution

The study presents a novel oxide-interfaced approach for forming lattice-mismatched heterostructures, supported by theory and experimental demonstrations across multiple material systems.

Findings

Successful formation of various lattice-mismatched heterostructures.

High electrical performance of diodes from these heterostructures.

Versatility of the oxide-interfaced method for different material combinations.

Abstract

Semiconductor heterostructure is a critical building block for modern semiconductor devices. However, forming semiconductor heterostructures of lattice-mismatch has been a great challenge for several decades. Epitaxial growth is infeasible to form abrupt heterostructures with large lattice-mismatch while mechanical-thermal bonding results in a high density of interface defects and therefore severely limits device applications. Here we show an ultra-thin oxide-interfaced approach for the successful formation of lattice-mismatched semiconductor heterostructures. Following the depiction of a theory on the role of interface oxide in forming the heterostructures, we describe experimental demonstrations of Ge/Si (diamond lattices), Si/GaAs (zinc blende lattice), GaAs/GaN (hexagon lattice), and Si/GaN heterostructures. Extraordinary electrical performances in terms of ideality factor, current on/off ratio, and reverse breakdown voltage are measured from p-n diodes fabricated from the four types of heterostructures, significantly outperforming diodes derived from other methods. Our demonstrations indicate the versatility of the ultra-thin-oxide-interface approach in forming lattice-mismatched heterostructures, open up a much larger possibility for material combinations for heterostructures, and pave the way toward broader applications in electronic and optoelectronic realms.