摘 要: | IntroductionAt present Hg Cd Te is the most widely used variable-gap semiconductor for infrared( IR) photodetectors.Over the years it has successfully fought off majorchallenges from extrinsic silicon and lead- tin telluridedevices despite that it has more competitors todaythan ever before.These include Schottky barriers onsilicon,Si Ge heterojunctions,Al Ga As multiplequantum wells,Ga In Sb strained layer superlattices,high temperature superconductors and especially twotypes of thermal …
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