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采用磁控溅射法制备的La1-xSrxMnO3(LSMO)/TiO2异质pn结表现出很好的整流特性.室温电流电压特性曲线显示随着Sr掺杂的增加,扩散电压增大,这可能由于Sr掺杂的增加导致载流子浓度增大所致.电流电压变温特性曲线显示随着测量温度的降低,扩散电压增大,这可能由于随着测量温度的变化导致界面电子结构的变化所致.值得提出的,异质pn结电阻随温度变化曲线表现出单层LSMO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.
The La1-xSrxMnO3 (LSMO) / TiO2 heterojunction pn junction prepared by magnetron sputtering shows good rectifying characteristics.The room temperature current-voltage characteristic curve shows that as the Sr doping increases, the diffusion voltage increases, which may be due to The increase of Sr doping results in the increase of carrier concentration.The current-voltage temperature-dependent characteristic curve shows that as the measured temperature decreases, the diffusion voltage increases, which may be due to the change of the interface electronic structure as the measured temperature changes It is worth mentioning that the heterogeneous pn junction resistance exhibits a metal-insulating phase transition characteristic of a single-layer LSMO as a function of temperature and shows an increase in junction resistance as the measured temperature decreases at low measurement temperatures, which may be due to broadband The introduction of interstitial TiO2 results.