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Improved control of composition and electrical properties of liquid phase epitaxial (CdHg)Te layers
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Astles, M.G., Shaw, N., Blackmore, G. and Hall, Ralph (1992) Improved control of composition and electrical properties of liquid phase epitaxial (CdHg)Te layers. Journal of Crystal Growth, 117 (1-4). pp. 213-217. doi:10.1016/0022-0248(92)90747-7 ISSN 0022-0248.
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Official URL: http://dx.doi.org/10.1016/0022-0248(92)90747-7
Abstract
The use of powdered HgTe as a source of mercury in a graphite sliding boat used for liquid phase epitaxial (LPE) growth of CdxHg1−xTe alloys from Te-rich solutions at 460°C has been found to give excellent reproducibility of alloy composition, x and thickness due to the low Hg loss rates during growth (typically 0.3 mg min-1). Reproducibility of the wavelength corresponding to an absorption coefficient, α, of 500 cm-1 (λα = 500) is ± 0.15 μm, while the thickness reproducibility is typically ± 1 μm for 20μm thick layers. The variation of composition with depth in the layers is typically (2–4)x10-4 in x per μm. Background carrier concentrations in undoped layers after Hg-rich annealing to remove Hg vacancies are n = (6–8)x1013 cm-3. Using SIMS analysis we have shown that In is 100% electrically active after Hg-rich annealing and that the In dopant does not diffuse during the anneal treatment. Copper (Cu) doping has been studied for p-type material in the range 8×1015 to 2×1018 cm-3. The Cu appears to be nearly 100% electrically active in as-grown layers, but during Hg-rich isothermal annealing at 250° C, a certain proportion of the Cu diffuses to the surface leaving only about 30% of the Cu in the bulk of the layer still electrically active.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Crystal Growth | ||||
Publisher: | Elsevier | ||||
ISSN: | 0022-0248 | ||||
Official Date: | February 1992 | ||||
Dates: |
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Volume: | 117 | ||||
Number: | 1-4 | ||||
Page Range: | pp. 213-217 | ||||
DOI: | 10.1016/0022-0248(92)90747-7 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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