中文摘要：

采用磁控溅射方法，首次在n型Nb0．01SrTi0．99O3单晶衬底上成功制备出La0．7Sr0．3MnO3/Nb0．01SrTi0．99O3异质p-n结。电学性能测试表明，该异质结在40～320K温度范围内均表现出较好的整流特性，且扩散电势随温度升高而降低。这是由于耗尽层厚度在热扩散作用下逐渐变薄以及温度对界面电子结构调制作用的共同结果。随外加正向偏置电流的增加，提高La0．7Sr0．3MnO3薄膜中的空穴浓度，增强其双交换作用，使金属-绝缘转变温度从200K升高至约250K。

英文摘要：

The La0.7Sr0.3MnO3/Nb0.01SrTi0.99O3 p-n junction fabricated by the magnetron sputtering technique exhibits excellent rectifying characteristics over the temperature range from 40 to 320 K, nearly independent of the temperature. The modulated electromagnetic property of La0.7Sr0.3MnO3 is also achieved by the built-in electric field near the interface of junction. The diffusion potential decreases almost linearly with increasing the temperatures. It can be understood by considering a picture that the depletion layer in p-n junction becomes thinner and thinner with the increase of temperature due to the thermal diffusion effect. In addition, this phenomenon is also attributed to the variation of the electronic structure of LSMO with temperature increasing. The junction resistance decreases sharply when the applied forward current increases from 1 mA to 50 mA while the insulator-metal transition temperature Tp increases from around 200 K to 250 K due to the strength enhancement of the ferromagnetic double-exchange interaction.