首次采用离子注入工艺研究金属电极和p-GaN的欧姆接触特性.Zn为Ⅱ族元素,可以提高p-GaN表面的栽流子浓度,对p-GaN/Ni/Au(5/10nm)界面处进行Zn+注入.经Zn+注入后的样品在空气氛围中快速热退火处理5min,以减少离子注入带来的晶格损伤.研究发现Zn+注入改善了p-GaN/Ni/Au的欧姆接触特性,接触电阻率ρc从10-1Ω·cm2数量级降低到10-3Ω·cm2数量级.研究了不同Zn+注入剂量(5×1015、1×1016、5×1016cm-2)对接触电阻率的影响,在注入剂量为1×1016cm-2、300℃下退火得到最优的接触电阻率为1.45×10-3Ω·cm2.用扫描电子显微镜观察了离子注入前后的表面形貌变化,探讨了接触电阻率改变的内在机制.
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