Analysis of Barrier Parameters on the Extended Threshold Wavelength of Infrared Detectors

Divya Somvanshi, Dilip Chauhan, A. G. Unil Perera, Lianhe Li, L. Chen, Edmund H. Linfield
2018 IEEE Photonics Technology Letters  
The threshold wavelength ( t ) of spectral photoresponse of any semiconductor photodetector is determined by the minimum energy gap (∆ = 1.24/ t ) of the material, or the interfacial energy gap of the heterostructure. It was shown before that the threshold limit can be extended beyond t to obtain an extended threshold wavelength eff ( eff >> t ) in detectors with a barrier energy offset ( E v ) and a gradient. Here, in this letter, we analyze the effect of barrier parameters such as E v and
more » ... ient on the extended threshold wavelength of infrared detectors for the temperature range up to 50 K.
doi:10.1109/lpt.2018.2860631 fatcat:4pgcn2v56nebpon42tglo647wa