中文摘要：

利用脉冲激光沉积技术在掺Nh的SrTiO3衬底上制备了氧非正分La0.9Ba0.1MnO3-σ／SrTiO3：Nbp-n异质结。在20-300K这一较宽的温度范围内获得了光滑的整流曲线，整流实验表明：该p-n异质结的正向扩散电压VD随着温度升高在薄膜金属-绝缘转变温度附近出现极大值，表现出与氧正分La0.9Ba0.1MnO3-σ／SrTiO3：Nbp-n结截然不同的温度特性,结合薄膜的电阻-温度实验和能带计算结果，对这一奇异的现象进行了解释。

英文摘要：

The La0.9Ba0.1MnO3-σ/SrTiO3：Nbp-n heterojunctions have been fabricated by growing the oxygen nonstoichiometricLa0.9Ba0.1MnO3-σ thin film on the Nb doped SrTiO3 substrate with pulsed laser deposition. The good rectifying curves have been demonstrated in the temperature range of 20-300 K. The diffusion voltage VD exhibits a maximum near the transition temperature of La0.9Ba0.1MnO3-σ thin film, which is different to the observation in the oxygen stoichiometric La0.9Ba0.1MnO3-σ/SrTiO3：Nbp-n heterojunction. The interesting phenomenon has been well explained with the resistance-temperature experiment of La0.9Ba0.1MnO3-σ thin film and energy band calculations.