摘要
With the increasing demand for multispectral information acquisition,infrared multispectral imaging technology that is inexpensive and can be miniaturized and integrated into other devices has received extensive attention.However,the widespread usage of such photodetectors is still limited by the high cost of epitaxial semiconductors and complex cryogenic cooling systems.Here,we demonstrate a noncooled two-color infrared photodetector that can provide temporal-spatial coexisting spectral blackbody detection at both near-infrared and mid-infrared wavelengths.This photodetector consists of vertically stacked back-to-back diode structures.The two-color signals can be effectively separated to achieve ultralow crosstalk of~0.05%by controlling the built-in electric field depending on the intermediate layer,which acts as an electron-collecting layer and hole-blocking barrier.The impressive performance of the two-color photodetector is verified by the specific detectivity(D^(*))of 6.4×10^(9)cm Hz^(1/2)W^(−1)at 3.5μm and room temperature,as well as the promising NIR/MWIR two-color infrared imaging and absolute temperature detection.
基金
This work was supported by the National Natural Science Foundation of China(Grant No.62122081,61905266,62134009,61725505,11734016,61974050)
Youth Innovation Promotion Association CAS
Fund of Shanghai Natural Science Foundation(Grant No.21JC1406100,19YF1454600 and 19XD1404100).
