Universal radiation tolerant semiconductor

TL;DR

This paper demonstrates that gamma/beta double polymorph Ga2O3 structures exhibit exceptional radiation tolerance, maintaining crystallinity under high radiation doses, making them promising universal radiation tolerant semiconductors.

Contribution

The study reveals the high radiation tolerance of gamma/beta Ga2O3 structures and explains the underlying mechanisms, introducing a new class of universal radiation tolerant semiconductors.

Findings

Gamma/beta Ga2O3 withstands hundreds of displacements per atom.

O-sublattice shows strong recrystallization tendencies.

Gamma/beta transformation depends on disorder and implanted atoms.

Abstract

Radiation tolerance is determined as the ability of crystalline materials to withstand the accumulation of the radiation induced disorder. Nevertheless, for sufficiently high fluences, in all by far known semiconductors it ends up with either very high disorder levels or amorphization. Here we show that gamma/beta double polymorph Ga2O3 structures exhibit remarkably high radiation tolerance. Specifically, for room temperature experiments, they tolerate a disorder equivalent to hundreds of displacements per atom, without severe degradations of crystallinity; in comparison with, e.g., Si amorphizable already with the lattice atoms displaced just once. We explain this behavior by an interesting combination of the Ga- and O- sublattice properties in gamma-Ga2O3. In particular, O-sublattice exhibits a strong recrystallization trend to recover the face-centered-cubic stacking despite the stronger displacement of O atoms compared to Ga during the active periods of cascades. Notably, we also explained the origin of the beta-to-gamma Ga2O3 transformation, as a function of the increased disorder in beta-Ga2O3 and studied the phenomena as a function of the chemical nature of the implanted atoms. As a result, we conclude that gamma/beta double polymorph Ga2O3 structures, in terms of their radiation tolerance properties, benchmark a class of universal radiation tolerant semiconductors.