Long wavelength HgMnTe avalanche photodiodes

Abstract

Long wavelength avalanche photodiodes have been fabricated using bulk Hg 1 _ .. Mn .. Te (0.10 < x < 0.12) single crystals, grown by the traveling heater method. Avalanche multiplication gains (M) greater than 40 and 10 were obtained at wavelengths of 7 and 10.6 fLm, respectively. The ionization coefficient ratio of electrons to holes was determined experimentally from the measurements of the excess noise versus the avalanche multiplication factor. At both wavelengths, the ionization coefficient ratio was found to be approximately 12.

Ultraviolet photoemission study of electronic structure of Cd1-xMxSe (M - Mn, Fe, Co) semimagnetic semiconductors

“…The 3d electrons of transition metal are superimposed on the valence band continuum and strongly influence on its valence band electronic structure. The high sensitivity of optical and transport properties on magnetic field and the possibility to prepare crystals with tunable band gap e.g., Cd,-,-,,Hg,Mn,Te make SMSC as a very interesting material for new applications as a magnetic field tunable infrared detector [5].…”

HgTe-based photodetectors in Poland

“…Typical quantum efficiencies were in the 20-40% range without using an antireflection coating. Becla et al have also developed HgMnTe avalanche photodiodes [68]. Several p-n and p-n mesa type structures were fabricated, which permitted the injection of minority carriers from both n-and p-type regions, and led to holeinitiated and electron-initiated avalanche gain.…”

“…Since then, an interest has started to develop infrared detectors as alternative to HgCdTe ones. Development of HgMnTe photovoltaic detectors is mainly connected with the name of P. Becla [67][68][69], Polish scientist previously working at Wrocław Technical University and at present at Massachusetts Institute of Technology.…”

An infrared free-electron laser for the Chemical Dynamics Research Laboratory. Design report

“…Commercially available nonlinear crystals allow frequency doubling of wavelengths up to 12.6 p.m (for example, AgGaSez can be used in the 3-to 12.6-p.m range). Further, recent experiments suggest that CdMnTe could be used to extend the wavelength range to 40 p.m [Becla et al, 1992].…”