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- W2007152102 abstract "Impurity incorporation is studied as a function of metalorganic vapor phase epitaxy growth conditions. The same GaN growth conditions were used initially, resulting in films with approximately the same dislocation density, after which a single growth parameter was varied and the impurity concentrations measured using SIMS. The C concentrations were found to decrease with increasing growth temperature, pressure, and ammonia flow, and to increase with increasing H2 carrier and trimethylgallium flow. The Si concentrations for both unintentionally doped (UID) and intentionally doped (ID) films increased with increasing growth pressure. The UID and ID Si concentrations varied inversely with the GaN growth rate, suggesting an independent source for UID Si within the reactor. Moreover, the NH3 flow rate influenced the Si-doping concentration, even though the GaN growth rate remained constant. A H2/NH3 etching mechanism is proposed to explain the growth parameter influence on the observed C and Si concentrations. The reduction in the ID Si concentrations at high NH3 flows is explained by NH3 site blocking, similar to that proposed for increased Ga vacancies at high NH3 flows." @default.
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- W2007152102 date "2002-07-01" @default.
- W2007152102 modified "2023-10-02" @default.
- W2007152102 title "Influence of MOVPE growth conditions on carbon and silicon concentrations in GaN" @default.
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- W2007152102 doi "https://doi.org/10.1016/s0022-0248(02)01348-9" @default.
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