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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tansley, T.L. |
| Copyright Year | 1997 |
| Description | Author affiliation: Semicond. Sci. & Technol. Lab., Macquarie Univ., North Ryde, NSW, Australia (Tansley, T.L.) |
| Abstract | Recent work in the semiconducting nitrides AlN, GaN, InN and their ternary derivatives includes the low-temperature enhancement of MOCVD growth through a combination of ultraviolet laser photodissociation of metal precursors and microwave-plasma activated nitrogen radicals. These modifications allow the relative simplicity of low-pressure MOCVD to be successfully shifted to the 500-600/spl deg/C temperature range for GaN, and to room temperature for AlN. Advantages include the availability of short-period multilayers and abrupt heterostructures, free from the cross-diffusion of either ternary constituents or dopants. Thermally fragile substrates now also become available. The binaries grown by this method compare well with conventional MOCVD, room-temperature mobilities up to 400 cm/sup 2/ V/sup -1/ s/sup -1/ are obtained in GaN and as-grown carrier concentrations in the range 10/sup 15/-10/sup 17/ cm/sup -3/ can be controlled via the plasma density. CP/sub 2/Mg is used as counterdopant. Composition of AlGaN and InGaN is determined by precursor ratios, the relationship is linear in the former case but not in the latter. AlN with excellent dielectric properties has been deposited on unstable CdHgTe at 50C. We also mention the roles of microcrystallinity and polytypism in the physical properties of our materials as a function of substrate/buffer combination. |
| Starting Page | 374 |
| Ending Page | 381 |
| File Size | 577852 |
| Page Count | 8 |
| File Format | |
| ISBN | 0780333748 |
| DOI | 10.1109/COMMAD.1996.610147 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1996-12-08 |
| Publisher Place | Australia |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Semiconductivity Gallium nitride MOCVD Plasma temperature Temperature distribution Dielectric substrates Chemical lasers Semiconductor lasers Masers Nitrogen |
| Content Type | Text |
| Resource Type | Article |
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