Structural design of long wavelength interband cascade photodetectors
Received:March 12, 2018  Revised:October 04, 2018  download
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Author NameAffiliationE-mail
TIAN Yuan Shanghai Institute of Technical Physics, Chinese Academy of Sciences tianyuan@shanghaitech.edu.cn 
ZHOU Yi Shanghaitech Institute of Technical Physics zhouyi@mail.sitp.ac.cn 
CHAI Xu-Liang Shanghaitech Institute of Technical Physics  
XU Zhi-Cheng Shanghaitech Institute of Technical Physics  
CHEN Jian-Xin Shanghaitech Institute of Technical Physics jianxinchen@mail.sitp.ac.cn 
HE Li Shanghaitech Institute of Technical Physics  
Abstract:Aiming at the design and application of the interband cascade structure in long wavelength detection, E-k relation and energy band information of multi-quantum-well relaxation region were calculated by using two-band model under the envelope-function approach and transfer matrix method.The structure of relaxation region was specially optimized.On the premise of the tunneling process of photon-generated carriers in relaxation region, the electric field of absorption region was reduced to suppress generation-recombination current and tunneling current, and to improve the electrical performance of device.The quantum efficiency of prepared double-stage interband cascade photodetector was up to 20% at 10.5 μm, which proved that the relaxation region and tunneling region had well transport of photoexcited carriers.The 50% cutoff wavelength of the device was 11.5 μm at 80 K, which was the longest wavelength infrared detector of interband cascade structure at 80 K.
keywords:long wavelength interband cascade photodetector  transfer matrix method  energy band
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Copyright:《Journal of Infrared And Millimeter Waves》