1.Shanghai Institute of Technical Physics,Chinese Academy of Science;2.University of Chinese Academy of Sciences;3.Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences
the National Natural Science Foundation of China (11933006) and the Frontier Science Research Project (Key Programs) of the Chinese Academy of Sciences (QYZDJ-SSW-SLH018)
Blocked impurity band (BIB) detectors are the start-of-art choice for far infrared astronomical observation. Ge:B BIB far infrared detector has been successfully developed using near surface process technique. The spectral response covers a wide range from 50 cm^(-1) to 400 cm^(-1). At 3.5 K and at 30 mV, the detector exhibits a highly competitive responsivity 21.46 A/W and a highly competitive detectivity of 4.34×10^14 cm?Hz1/2?W-1 at the peak response of 84.9 cm^(-1). We have studied the influence of the interfacial barriers on the spectral response. A new excitation model that the carriers in the contact regions can be excited over the interfacial barriers is proposed. A new method to enhance the relative response intensity of BIB detectors in the low wavenumber region is found.