二维材料在红外探测器中的应用最新进展（特邀）

二维材料，具有原子厚度，以其独特的物理、化学性质，吸引了广大研究人员的关注，成为了众多研究领域（如物理、材料、电子、光电子和化学等）的明星材料。因二维材料具有较高的载流子迁移率、强的光-物质相互作用、电/光学性质各向异性等，使其在光电子领域具有光明的应用前景。其中，窄带隙二维材料，如黑磷、黑磷砷等，在红外光电探测器中表现出巨大的应用潜力，成为了红外探测领域的新宠。文中将对二维材料在红外探测器中的应用，特别是光子型光电探测器的最新进展进行介绍。首先对二维材料的背景进行介绍；然后介绍表征光电探测器的关键参数；接着介绍二维材料在红外探测器中的最新进展，分别展示了单二维材料红外探测器、异质结红外探测器和光波导红外探测器方面的进展；最后对二维材料在红外探测器中的应用进行展望。

Recent advances in two-dimensional materials in infrared photodetectors (invited)

Two-dimensional (2D) materials, which have a thickness on the atomic scale, have attracted wide attention due to their unique physical and chemical properties. Because of their high carrier mobility, strong light-matter interaction, and anisotropic electronic/optical properties, etc., 2D materials show promising applications in optoelectronics. Among the 2D materials, narrow band gap semiconductors, such as black phosphorus, black arsenic phosphorus, etc., have shown huge potential in infrared photodetectors and have become star materials in infrared photodetectors. In this review, recent advances in 2D materials in infrared photodetectors are introduced, with an emphasis on photodetectors depending on the inner photoelectronic effect. First, the background of 2D materials is introduced. Then, the key parameters for infrared photodetectors, such as the responsivity, quantum efficiency, specific detectivity, and response speed, are listed. This is followed by the presentation of the recent advances of 2D materials in infrared photodetectors, which is divided into three parts: single component 2D material photodetectors, heterostructure infrared photodetectors, and waveguide photodetectors. Finally, a summary and outlook are provided for a guideline. We hope the present review will show the huge potential of 2D materials in infrared photodetectors and attract more exciting work on infrared photodetectors based on 2D materials in the future.