Electrical and optical properties of carbon-doped GaSb
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Bibliographic record
Abstract
We report low-temperature Hall-effect and photoluminescence measurements on samples of GaSb lightly doped with carbon in the range of ${10}^{16}--\mathrm{}5\ifmmode\times\else\texttimes\fi{}{10}^{17}{\mathrm{cm}}^{\ensuremath{-}3}.$ Temperature, excitation intensity, and impurity concentration dependent photoluminescence (PL) measurements were used to determine a shallow acceptor binding energy for carbon in GaSb of $12.9\ifmmode\pm\else\textpm\fi{}1\mathrm{meV}.$ The carbon acceptor PL transition was determined to be due to a combination of donor-acceptor pair and free-to-bound processes. Temperature-dependent Hall-effect analysis of hole concentration and mobility were performed on nominally undoped and lightly carbon-doped epilayers and on bulk undoped Czochralski-grown GaSb. Experimental hole concentrations of the carbon-doped epilayers were fitted to a two acceptor model that included the deep native acceptor and shallow carbon acceptor levels. Activation energies of 8--11 meV were determined for the lightest carbon-doped samples through least-squares fitting of the experimental hole concentration versus temperature. Carbon-doped epilayers showed significantly higher impurity band conduction at low temperatures than Czochralski-grown GaSb due to the shallower nature of the carbon acceptor levels. Hall mobility data confirmed the presence of impurity band conduction below 10 K, in addition to the usual scattering mechanisms.
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Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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