硫基波导集成的黑磷异质结中红外探测器研究

在室温下实现中红外波段波导集成光探测是发展新一代中红外传感、通讯、激光雷达芯片的重要基础，该技术的实现关键在于提高室温下中红外探测器的信噪比。与传统材料相比，二维黑磷材料作为新兴中红外探测材料在性能上具有独特优势。但目前国际上利用其实现波导集成中红外探测还存在着两个难题：1.缺乏中红外光子材料与二维黑磷复合集成的实现方法；2.如何提高波导集成中红外探测器室温下信噪比。本项目探索硫基材料同二维黑磷材料无损复合集成方法；理论探索波导集成二维黑磷中红外探测器的设计方案及性能预测方法；探索利用电场或堆叠方式构建横向或纵向黑磷异质结的方法及其探测机制；探索利用硫基光子晶体结构来进一步增强光与黑磷异质结的相互作用的机理，从而在保证高量子效率的前提下减小探测器暗电流，实现室温下高信噪比中红外波段光探测。研究结果将对室温下高性能中红外探测和新一代中红外集成光电子技术的发展具有重要意义。

Waveguide integrated mid-infrared (mid-IR) photon detection at room temperature appears to be important in the development of the next generation mid-IR integrated photonics chip, which can be widely used in various applications including sensing, communication, and LIDAR etc. The key is to maximize the detector Signal-to-Noise Ratio (SNR). Two-dimensional black phosphorus has been recognized as emerging materials and they possess unique advantages compared with tradition materials for mid-IR light detection. However, it faces two challenges while being applied for mid-IR waveguide integrated photon detection. The first one is the lack of hybrid integration method for mid-IR photonic materials with two-dimensional black phosphorus. The second one is how to improve the SNR of waveguide integrated mid-infrared photodetector. This project will explore the method to obtain high-performance black phosphorus while integrated with chalcogenide photonic structures. Further, theoretical models for design and device performance predictions will be conducted for the waveguide integrated two-dimensional materials photodetectors. The detection mechanism of waveguide integrated black phosphorus heterojunction photodetector will be investigated through applying an electric field or stacking black phosphorus with other two dimensional materials to achieve lateral or vertical heterojunction. Chalcogenide photonic crystal structure will also be integrated with the heterojunctions to further improve light mater interaction, which could lead to lower dark current while achieving higher quantum efficiency and SNR for the mid-IR light detection at room temperature. The research results will be of great significance for the development of high-performance mid-IR detection at room temperature and the development of a new generation of mid-IR integrated photonics technology.