Indium Antimonide (InSb)

Indium Antimonide (InSb) is a narrow gap semiconductor material from the III-V group used in infrared detectors, including thermal imaging cameras, FLIR systems, and in astronomy. The InSb detectors are sensitive between 1 µm to 5 µm wavelengths.

InSb is a crystalline compound made from the elements indium and antimony. It has the appearance of dark grey silvery metal pieces or powder with vitreous luster. When subjected to temperatures over 500 °C, it melts and decomposes, liberating antimony and antimony oxide vapors.

InSb photodiode detectors are photovoltaic, generating electric current when subjected to infrared radiation. InSb has high quantum efficiency (80-90%). InSb detectors are used where extreme sensitivity is required, e.g. in long-range military thermal imaging systems. InSb detectors also require cooling, as they have to operate at cryogenic temperatures (typically 80 K).

Gallium Antimonide (GaSb)

Gallium Antimonide (GaSb) crystals are grown using the Czochralski method.

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