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GaN Based High Temperature Ultraviolet Photodetectors Emcore Corporation Somerset, NJ

p-contact (Ni/Au). AR coating/passivation (SiO 2 ). n-contact (Ti/Al/Ti/Au). semi-transparent p-contact (Ni/Au). contact pad (Cr/Au ). p + :GaN. n - :GaN. n + :GaN. Sapphire. Best Reported Dark Currents: <2nA/cm 2 at -10V. S mall B usiness I nnovation R esearch.

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GaN Based High Temperature Ultraviolet Photodetectors Emcore Corporation Somerset, NJ

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  1. p-contact (Ni/Au) AR coating/passivation (SiO2 ) n-contact (Ti/Al/Ti/Au) semi-transparent p-contact (Ni/Au) contact pad (Cr/Au ) p+:GaN n-:GaN n+:GaN Sapphire Best Reported Dark Currents: <2nA/cm2 at -10V Small Business Innovation Research GaN Based High Temperature Ultraviolet PhotodetectorsEmcore CorporationSomerset, NJ INNOVATION EMCORE Corporation and the University of Texas have developed robust UV detectors based on GaN to replace existing photomultiplier or silicon technology ACCOMPLISHMENTS • Produced homo-junction detectors with the lowest dark current (<2nA/cm2), highest quantum efficiency (>40%), fastest time response (26 ps) and largest bandwidth (3 GHz) reported to date. • Produced one of the first APDs in GaN with gains >20, a breakdown field of 4x106Vcm-1 and a positive temperature coefficient for breakdown. COMMERCIALIZATION • Over $2.2M in Phase III funding has been obtained to further enable the technology: • NASA-CETDP: $375K to develop GaN CCDs arrays. • NASA-ROSS: $271K to develop GaN photodiode arrays. • DARPA: $894K as a subcontract to LMIR to develop solar blind arrays. • BMDO: $678K to develop APD structures. • Commercial applications include; environmental monitoring, automobile engine combustion sensing, solar UV monitoring, burner monitoring in gas turbines, and flame detection • GOVERNMENT SCIENCE/APPLICATIONS • NASA: Remote sensing of earth resources Atmospheric ozone-level monitoring, and UV astronomy • Military: Ground Vehicle Self Protection, Airborne Missile Threat Warning, Biological agent detection, and • Engine monitoring and combustion control • EMCORE is working with LMIR on a DARPA funded program to develop GaN UV detectors for the next generation of AN/AAR-47 Ultraviolet Helos Transports and AN/AAR-57 Ultraviolet Helos Transports Tactical systems. Points of Contact: - NASA - D. Brent Mott; (301) 286-7708 - EMCORE Corporation; Ian Ferguson; (732) 271-9090 x4114 - UT Austin; Joe Campbell; (512) 471-9669 Goddard Space Flight Center 1995 Phase II, SS5-038, 5/16/00

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