采用脉冲激光沉积(PLD)技术在硅片上合成了AlN薄膜.X射线衍射(XRD)结果证实制备的AlN薄膜具有(002)择优取向的六方纤锌矿晶体结构,并且结晶质量随Si衬底温度的提高而改善.电流-电压(I-V)、电容-电压(C-V)、极化曲线结果表明室温生长的AlN薄膜的击穿场强约2.5MV/cm,同时呈现明显的极化现象(类铁电),对应矫顽场强为150kV/cm,剩余极化为0.002C/m2.晶态AlN存在较强的自发极化,薄膜中可动电荷密度高,据此提出了动态电荷模型,指出较大的AlN薄膜极化回线是由于可动电荷在电场中的再分布形成的,因而有别于铁电材料.
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