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Ohmic contacts to n-type GaN with low contact resistance were developed by (NH4)2Sx and KOH+(NH4)2Sx surface treatments prior to Ti/Al metal deposition. The lowest specific contact resistance of 3.0×10−6 Ω-cm2 was obtained for Ti/Al contacts in an (NH4)2Sx-treated GaN layer alloyed at 300°C for 3 min. To obtain the lowest specific contact resistance for a low temperature alloy, the (NH4)2Sx treatment...
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