As infrared photodetection technology advances,critical challenges persist in developing devices that simultaneously achieve compact structures,high anisotropy ratios(ARs),ultrafast response speeds,and simplified fabr...As infrared photodetection technology advances,critical challenges persist in developing devices that simultaneously achieve compact structures,high anisotropy ratios(ARs),ultrafast response speeds,and simplified fabrication processes.Black phosphorus(BP)offers inherent advantages over conventional infrared materials through its anisotropic optical absorption and superior vertical charge transport properties.However,the performance of BP-based devices has been limited by intrinsic material constraints that restrict polarization sensitivity and response speed.Here,we present a high-performance infrared photodiode based on BP that simultaneously achieves extraordinary polarization-dependent absorption and ultrafast response.By integrating an optical microcavity with asymmetric vertical contacts,we achieved a record polarization AR of 30.6 and an exceptional response time of∼40 ns.In addition,the photodetector demonstrates high responsivity,with a room-temperature specific detectivity of 1.27×10^(10)cm Hz^(1∕2)W^(-1).Notably,these performance metrics are achieved at zero bias,enabling polarization-sensitive detection with minimal power consumption.The device supports a detection range extending to 3.6μm at room temperature and demonstrates remarkable stability for practical applications.We further validate its capability for polarization-resolved infrared imaging through demonstration of Stokes parameter detection.These findings establish a compelling performance benchmark for polarization-sensitive infrared photodetectors and provide a viable pathway toward advanced infrared imaging.展开更多
基金supported by the National Key Research and Development Program of China(Grant Nos.2021YFA0715602 and 2023YFB3611400)National Natural Science Foundation of China(Grant Nos.T2521003,62334011,62327812,62261136552,62361136587,and 62134001)CAS Project for Young Scientists in Basic Research(Grant No.YSBR-113)。
文摘As infrared photodetection technology advances,critical challenges persist in developing devices that simultaneously achieve compact structures,high anisotropy ratios(ARs),ultrafast response speeds,and simplified fabrication processes.Black phosphorus(BP)offers inherent advantages over conventional infrared materials through its anisotropic optical absorption and superior vertical charge transport properties.However,the performance of BP-based devices has been limited by intrinsic material constraints that restrict polarization sensitivity and response speed.Here,we present a high-performance infrared photodiode based on BP that simultaneously achieves extraordinary polarization-dependent absorption and ultrafast response.By integrating an optical microcavity with asymmetric vertical contacts,we achieved a record polarization AR of 30.6 and an exceptional response time of∼40 ns.In addition,the photodetector demonstrates high responsivity,with a room-temperature specific detectivity of 1.27×10^(10)cm Hz^(1∕2)W^(-1).Notably,these performance metrics are achieved at zero bias,enabling polarization-sensitive detection with minimal power consumption.The device supports a detection range extending to 3.6μm at room temperature and demonstrates remarkable stability for practical applications.We further validate its capability for polarization-resolved infrared imaging through demonstration of Stokes parameter detection.These findings establish a compelling performance benchmark for polarization-sensitive infrared photodetectors and provide a viable pathway toward advanced infrared imaging.
