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利用ICPCVD方法在GaN上沉积氧化硅薄膜的特性

Keywords: ICP-CVD SiOx 薄膜应力 表面粗糙度 界面态密度

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Abstract:

使用感应耦合等离子体化学气相沉积(Inductively coupled plasma chemical vapor deposition, ICPCVD)方法在GaN上沉积SiOx薄膜, 生长参数中采用不同RF功率, 研究RF功率对薄膜物理性能和电学性能的影响.结果发现, 随着RF功率增大, 薄膜应力增大, 表面粗糙度减小, 薄膜致密度增大.选择最优的RF功率参数, 制作了SiOx/n-GaN金属-绝缘体-半导体(metal-insulator-semiconductor, MIS)器件, 结果得到薄膜漏电流密度在外加偏压为90V时小于1×10-7A/cm2, SiOx/n-GaN界面态密度为2.4×1010eV-1cm-2.表明利用ICPCVD低温沉积的SiOx-GaN 界面态密度低, 薄膜绝缘性能良好

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