Defect identification in semiconductors with positron annihilation:<? format?> Experiment and theory

F Tuomisto, I Makkonen - Reviews of Modern Physics, 2013 - APS
Positron annihilation spectroscopy is particularly suitable for studying vacancy-type
defects<? format?> in semiconductors. Combining state-of-the-art experimental and …

Defects in single crystalline ammonothermal gallium nitride

S Suihkonen, S Pimputkar, S Sintonen… - Advanced Electronic …, 2017 - Wiley Online Library
Native bulk gallium nitride (GaN) has emerged as an alternative for sapphire and silicon as
a substrate material for III‐N devices. While quasi‐bulk GaN substrates are currently …

Review of radiation damage in GaN-based materials and devices

SJ Pearton, R Deist, F Ren, L Liu… - Journal of Vacuum …, 2013 - pubs.aip.org
A review of the effectsof proton, neutron, γ-ray, and electron irradiation on GaN materials
and devices is presented. Neutron irradiation tends to create disordered regions in the GaN …

Defects in AlN as candidates for solid-state qubits

JB Varley, A Janotti, CG Van de Walle - Physical Review B, 2016 - APS
We investigate point defects and defect complexes in AlN for potential applicability as single-
spin centers and solid-state qubits analogous to those observed in diamond and SiC. We …

Identification of the -O defect complex in AlN single crystals

JM Mäki, I Makkonen, F Tuomisto, A Karjalainen… - Physical Review B …, 2011 - APS
In this Rapid Communication, we report positron annihilation results on in-grown and proton
irradiation-induced vacancies and their decoration in aluminium nitride (AlN) single crystals …

Group III nitrides

RA Ferreyra, C Zhu, A Teke, H Morkoç - Springer Handbook of Electronic …, 2017 - Springer
Optical, electrical, mechanical, and thermal properties of group III nitrides, inclusive of AlN,
GaN, InN and their ternary and quaternary alloys, are discussed. The driving force for group …

Low energy electron beam induced vacancy activation in GaN

H Nykänen, S Suihkonen, L Kilanski… - Applied Physics …, 2012 - pubs.aip.org
Experimental evidence on low energy electron beam induced point defect activation in GaN
grown by metal-organic vapor phase epitaxy (MOVPE) is presented. The GaN samples are …

Native point defects in GaSb

J Kujala, N Segercrantz, F Tuomisto… - Journal of Applied …, 2014 - pubs.aip.org
We have applied positron annihilation spectroscopy to study native point defects in Te-
doped n-type and nominally undoped p-type GaSb single crystals. The results show that the …

Vacancy complexes induce long-range ferromagnetism in GaN

Z Zhang, U Schwingenschlögl, IS Roqan - Journal of Applied Physics, 2014 - pubs.aip.org
By means of density functional theory, we argue that ferromagnetism in GaN can be induced
by vacancy complexes. Spin polarization originates from the charge compensation between …