Loading...
News Article

Zincblende GaN promises high hole concentrations

News

University of Illinois team reveal a bright future for zb- III- nitride research, particularly for bipolar devices

Achieving high n- and p-type doping in GaN materials is essential to increase efficiency and power in solid-state lighting and RF/power electronics. The dopability of GaN is determined by the formation, activation, and self-compensation of dopants, which depend on the bonding nature between dopants and GaN.

GaN forms in wurtzite (wz-) and zincblende (zb-) phases. Yet, the knowledge of n- and p-type doping has been mostly developed on wz-GaN due to its stability and current industrial adaption.

Today, p-type doping of wz-GaN and their alloys remain challenging, particularly for reaching high (>1019 cm-3) hole concentrations. The main factor in the p-doping limitation has been attributed to the large activation energies of common acceptors (e.g. Mg with an activation energy of ~ 250 meV). Compared to the low (< 30 meV) activation energies of donors, this asymmetry between electron and hole concentrations limits performance of GaN photonics (e.g.LEDs, laser diodes) and electronics (e.g. RF/power transistors).

In Computational Materials Science 190 (2021) 110283, University of Illinois researchers led by Cam Bayram, associate professor of Electrical and Computer Engineering, Innovative COmpound semiconductoR LABoratory (ICORLAB), use first-principles calculations to study formation, activation, and self–compensation of Si, Ge, C, Be, and Mg for wz- and zb- GaN.

The results reveal impacts of symmetricity not only on the activation energies but also on the formation energies and self-compensation effects. Specifically, Mg activation energy is reduced to ~ 153 meV and vibrational analysis suggests that Mgi compensating donor is less favourable to form in zb- than wz-GaN, since the higher symmetricity of the interstitial site in zb- GaN renders a much smaller vibrational entropy. The authors estimate fourfold higher hole concentration is achievable in zincblende (w.r.t. wurtzite) GaN. These results promise a bright future for the zb- III- nitride research, particularly for bipolar devices.

The figure above shows formation energies of MgGa (acceptor) and Mgi (double donor) in wz-GaN (left) and zb-GaN (right). The reference lines highlight the activation energies (EA).

'Mitigate Self-Compensation with High Crystal Symmetry: A First–Principles Study of Formation and Activation of Impurities in GaN' by Y.-C. Tsai and C. Bayram; Computational Materials Science 190 (2021) 110283.

SiC MOSFETs: Understanding the benefits of plasma nitridation
Wolfspeed reports Q2 results
VueReal secures $40.5m to scale MicroSolid printing
Mitsubishi joins Horizon Europe's FLAGCHIP project
Vishay launches new high voltage SiC diodes
UK team leads diamond-FET breakthrough
GaN adoption at tipping point, says Infineon
BluGlass files tuneable GaN laser patents
QD company Quantum Science expands into new facility
Innoscience files lawsuit against Infineon
Riber revenues up 5% to €41.2m
Forvia Hella to use CoolSiC for next generation charging
Photon Design to exhibit QD simulation tool
Ortel transfers CW laser fabrication to Canada
Luminus adds red and blue multi-mode Lasers
PseudolithIC raises $6M for heterogeneous chiplet tech
Mesa sidewall design improves HV DUV LEDs
IQE revenue to exceed expectations
'Game-changing' VCSEL system targets clinical imaging
German start-up secures finance for SiC processing tech
Macom signs preliminaries for CHIPS Act funding
IQE and Quintessent partner on QD lasers for AI
EU funds perovskite tandems for fuel-free space propulsion
EU to invest €3m in GeSi quantum project
Transforming the current density of AlN Schottky barrier diodes
Turbocharging the GaN MOSFET with a HfOâ‚‚ gate
Wolfspeed launches Gen 4 SiC MOSFET technology
Report predicts high growth for UK's North East
Element Six unveils Cu-diamond composite
SemiQ launches hi-rel 1700V SiC MOSFETs
Lynred to exhibit Eyesential SWIR sensor for machine vision
Thorlabs buys VCSEL firm Praevium Research
×
Search the news archive

To close this popup you can press escape or click the close icon.
Logo
x
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in: