Role and influence of impurities on GaN crystal grown from liquid solution under high nitrogen pressure in multi-feed-seed configuration
|Michal Bockowski 1,2, Boleslaw L. Lucznik 1,2, Izabella Grzegory 1|
1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
There are some promising methods for obtaining good quality GaN crystals i.e. growth from the vapor phase, called HVPE1 or crystallization from a solution: growth in gallium/sodium solution, the sodium flux method2, or in supercritical ammonia, the ammonothermal method3. It is also well known that the High Nitrogen Pressure Solution (HNPS) growth allows obtaining high quality GaN crystals4. Recently, the multi-feed-seed (MFS) configuration in the HNPS growth method has been proposed and developed5. This configuration has been based on the conversion of free-standing HVPE-GaN crystals to the free-standing, pressure grown HNPS-GaN of much higher quality than the seeds. It has been already shown that the crystallization of GaN in the MFS configuration without an intentional doping results in growth of strongly n-type crystals with free electron concentration increasing with growth temperature. It has been suggested that so high free electron concentration in HNPS-MFS-GaN can be associated with high oxygen concentration in the material. Obviously, the oxygen impurities in the GaN crystals can be compensated by magnesium. The HNPS-MFS-GaN:Mg crystallization has been already reported6. Highly resistive crystals have been obtained. However, one big difference in crystal growth procedure has been noted. The crystallization process has proceeded on the (000-1) GaN surface instead of the (0001) surface, typical for n-type GaN growth. It can be thus suggested that polarity of the GaN seed surface is determined and controlled by the Ga solution and its impurities.
In this paper the role and influence of impurities such as oxygen, indium and magnesium on GaN crystal growth from liquid solution in the MFS configuration will be presented and discussed in details. The differences in the properties of differently doped GaN crystals will be shown. It will be also demonstrated that HNPS-MFS-GaN crystals can be successfully used as substrates for epitaxy of optoelectronic and electronic devices.
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Presentation: Oral at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, General Session 2, by Michal Bockowski
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17
Submitted: 2013-04-15 18:49 Revised: 2013-07-19 23:11
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