Physics – Optics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jcrgr..72..490n&link_type=abstract
(Ministere de la Recherche et de la Technologie, DRET, CEA, et al., International Conference on II-VI Compounds, 2nd, Aussois, F
Physics
Optics
13
Fiber Optics, Mercury Cadmium Tellurides, Optical Communication, Photodiodes, Energy Gaps (Solid State), Holes (Electron Deficiencies), Near Infrared Radiation, Spin-Orbit Interactions, Transmission Lines
Scientific paper
The use of Cadmium Mercury Telluride (CMT) alloys in the near infrared transmission links at 1.3-1.55 microns for fiber optical communication systems is discussed. The application of a solvent, Te, as the travelling heater method to achieve crystal growth and ingot formation of 15-40 mm in diameter is analyzed. Wide gap CMT photodiode with sensitive areas of 80 microns-5 mm are fabricated using a planar photolithographic process. The photodiode structure is based on the junction capacitance variation versus the reverse bias voltage and EBIC measurements; a diagram is given. The characteristics of Hg(0.3)Cd(0.7)Te photodiodes with a spectral sensitivity of 0.8-1.35 microns at low reverse bias voltage are described. At high reverse bias voltage of about -105V avalanche breakdown of Hg(0.3)Cd(0.7)Te photodiodes is detected. Wide gap CMT has a baandgap and spin-orbit spitting energy value in close proximity; this results in a high hole-to-electron ionization coefficient ratio producing CMT avalanche photodiodes of low excess noise. Tests reveal the superiority of CMT avalanche photodiodes as compared to Ge.
Meslage J.
Nguyen Duy T.
Pichard G.
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