A new theoretical method to study super-multiperiod superlattices has been developed. The method combines the precision of the 8-band kp-method with the flexibility of the shooting method and the Monte Carlo approach. This method was applied to examine the finest quality samples of super-multiperiod Al_0.3Ga_0.7As/GaAs superlattices grown by molecular beam epitaxy. The express photoreflectance spectroscopy method was utilized to validate the proposed theoretical method. For the first time, the accurate theoretical analysis of the energy band diagram of super-multiperiod superlattices with experimental verification has been conducted. The proposed approach highly accurately determines transition peak positions and enables the calculation of the energy band diagram, transition energies, relaxation rates, and gain estimation. It has achieved a remarkably low 5% error compared to the commonly used method, which typically results in a 25% error, and allowed to recover the superlattice parameters. The retrieved intrinsic parameters of the samples aligned with XRD data and growth parameters. The proposed method also accurately predicted the escape of the second energy level for quantum well thicknesses less than 5 nm, as was observed in photoreflectance experiments. The new designs of THz light-emitting devices operating at room temperature were suggested by the developed method.

X射线探测技术在医疗诊断、安防检测和科学研究等领域有着广泛的应用，直接型X射线探测器拥有更高的理论探测效率、空间和能量分辨率，受到了国内外的广泛关注。钙钛矿材料因其X射线衰减系数大、体电阻率高、光学带隙合适以及易大面积制造等优势，成为直接型X射线探测器的理想材料。随着对探测性能的需求的不断提高，合理的器件结构设计显得尤为重要。本文从电极工程和能带工程两个方面出发，综述了有关直接型钙钛矿X射线探测器器件结构设计的最新进展。最后，我们对这些研究进展进行了总结，并对未来的发展进行了展望。我们希望这篇综述能为研究者们提供参考和启发。

制作了一种近红外通讯波段的石墨烯/锗肖特基结光电探测器。采用化学气相沉积法制备高质量石墨烯，通过湿法转移法转移到n型锗表面，获得高性能石墨烯/锗的肖特基结器件。仿真与实验结果表明，石墨烯透明电极与锗衬底形成良好的肖特基接触，大大提升了器件的光生载流子收集效率。该器件在无光照条件下，整流比为5.3×10²，在光强为0.3 mW/cm²的1 550 nm近红外光的照射下，开关比为10²，响应度和探测率分别可达635.7 mA/W、9.8×10¹⁰ Jones。同时，器件具备较快的响应速度，在3 dB带宽处上升和下降时间分别为40 μs和35 μs。研究结果展示了高性能石墨烯/锗光电探测器在近红外光电系统中具有潜在的应用前景。