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- W2549976605 abstract "We report on the optimization of p-GaN layers for high indium (In) content InGaN applications by optimizing temperature, precursor CP2Mg flow rate and III/V ratio and report also on the optimization of p-contact performance. Using MOVPE, a 150 nm thick p-type GaN with moderate Mg doping and a 50 nm contact layer with high Mg doping concentration were grown on standard GaN templates at growth temperatures in the range of 850–1000 °C. Hall measurement yields hole concentration of 4.8 × 1017 cm−3 for the optimized sample. SIMS shows Mg concentration of 1.7 × 1020 cm−3 on average in the heavily doped and 4 × 1019 cm−3 on average in the moderately doped p-GaN layer for the optimized p-GaN. A multilayer Pd/Ag/Ni/Au metal contact has been deposited on this p-GaN and studied using the CTLM technique. Optimization of both p-GaN layers and p-contact processing led to a low resistance contact with specific contact resistivity of 6 × 10−4 Ω cm2. We believe, the very high Mg concentration of the surface layer in intimate contact with the contact metal reduces the Schottky barrier height and band bending. This optimization of p-GaN is an important step towards high efficiency green LEDs and solar cells." @default.
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- W2549976605 date "2016-11-17" @default.
- W2549976605 modified "2023-10-18" @default.
- W2549976605 title "Investigation of p-contact performance for indium rich InGaN based light emitting diodes and solar cells" @default.
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- W2549976605 doi "https://doi.org/10.1002/pssa.201600496" @default.
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