Abstract In this work, the La1.89Ce0.11CuO4−x (LCCO) film with good superconductivity is prepared on the basis of a close study on the process of fabricating the LCCO film via pulse laser deposition (PLD). The effects of heating, atmosphere, and annealing temperatures on the structure and superconducting properties of the LCCO film are studied, obtaining the optimal process that requires a deposition substrate temperature of 700 °C, an oxygen pressure of 30 Pa, and an annealing deoxygenation temperature of 600 °C. Subsequently, the electron/hole double-layer superconducting film (LCCO/YBa2Cu3O7−δ (YBCO) bilayers) is obtained by preparing LCCO film on the YBCO film. The R-T tests show that the initial superconducting transition temperature (Tc) of the YBCO in the bilayers is about 45 K, and the Tc of the LCCO is near 16 K. The further testing of the LCCO/YBCO bilayers under ultraviolet irradiation reveals that the structure can produce salient photovoltaic phenomena. The photovoltage and photocurrent experience a jump when the films undergo superconducting transition, indicating that the potential barrier at the LCCO/YBCO interface changes. This can be attributed to the transition of the interface barrier from a PN junction type to the Schottky junction type.

中文翻译：

---

La1.89Ce0.11CuO4−x薄膜制备工艺及电子/空穴超导体异质结结特性研究

摘要 本工作通过对脉冲激光沉积(PLD) 制备LCCO 薄膜的工艺进行深入研究，制备了具有良好超导性的La1.89Ce0.11CuO4−x (LCCO) 薄膜。研究了加热、气氛和退火温度对LCCO薄膜结构和超导性能的影响，得到了沉积衬底温度700℃、氧气压力30Pa、退火脱氧温度的最佳工艺600°C。随后，通过在YBCO薄膜上制备LCCO薄膜，得到电子/空穴双层超导薄膜（LCCO/YBa2Cu3O7-δ（YBCO）双层）。RT测试表明，双层中YBCO的初始超导转变温度（Tc）约为45 K，LCCO的Tc接近16 K。在紫外线照射下对 LCCO/YBCO 双层的进一步测试表明，该结构可以产生显着的光伏现象。当薄膜发生超导转变时，光电压和光电流发生跳跃，表明 LCCO/YBCO 界面处的势垒发生了变化。这可以归因于界面势垒从 PN 结型到肖特基结型的转变。