Textured crystal picosecond photoresponsive element

Details Textured crystal picosecond photoresponsive element Textured crystal picosecond photoresponsive element

H - Electricity

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345/26

H01L 27/14 (2006.01) H01L 31/0368 (2006.01) H01L 31/08 (2006.01) H01L 31/18 (2006.01)

Patent

CA 1256188

TEXTURED CRYSTAL PICOSECOND PHOTORESPONSIVE ELEMENT Abstract of the Disclosure Picosecond response photoconductors and photoresponsive elements can be provided that retain high carrier mobility and yet have short lifetime by providing on a crystal mismatched substrate a textured layer of domain regions wherein the domain size is such that the lifetime is proportional to the square of the size divided by the diffusion coefficient of the semiconductor material. The crystalline orientation in the domains with respect to the substrate is maintained. An embodiment is an approximately 0.1 micron thick textured layer of <111> GaAs grown on a <0001> hexagonal monocrystalline Al2O3 having domains approximately 1.0 micron with a carrier lifetime about 5 picoseconds and a carrier mobility of about 80 cm2 volt-1 sec-1.

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