本文利用磁控溅射法通过改变衬底温度成功制备出La0.8Sr0.2 MnO3/TiO2异质P-N结.当衬底温度升高时,LSMO/TiO2异质PN结表现出相对较好的整流特性.这可能是由于衬底温度的升高导致氧气吸收的增加,进而导致载流子浓度增大,串联电阻降低.电流电压的变温特性曲线显示随着测量温度的降低,扩散电压增大,这可能由于能带结构模型与热激活模型共同决定.值得提出的,异质P-N结结电阻随温度变化曲线呈现出单层LSMO表现的金属绝缘相变特性,并且在低测量温度时表现出随着测量温度的降低结电阻增大,这可能是由于宽带隙的TiO2的引入导致.
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