Accession Number : ADA180039

Title :   Enhanced Internal Photoemission Study.

Descriptive Note : Final rept. Jan 84-Feb 86,

Corporate Author : WESTINGHOUSE DEFENSE AND ELECTRONICS CENTER BALTIMORE MD ADVANCED TECHNOLOGY DIV

Personal Author(s) : McKee,Richard ; Colquitt,Leroy ; Greggi,James ; Janocko,Michael

PDF Url : ADA180039

Report Date : Oct 1986

Pagination or Media Count : 88

Abstract : Both theoretical modeling and physical and electrical characterization of PtSi Schottky gate infrared sensors are reported. A photoemission model for infrared photo-response of thin film PtSi Schottky devices has been developed including diffuse photo-electron scattering at the metal/semiconductor interface, film thickness, grain size and defect density effects. Cross sections and planar TEM work on bout 80A PtSi revealed epitaxial growth of PiSi (with three variants), smooth er metal/semiconductor interface, slightly larger gains (200A to 500A) and a more interconnected grain structure for PtSi formed (111) Si as opposed to (100) Si. PtSi films on both substrate orientations are continuous and have thickness variations 15% of the film thickness. TEM work 20A PtSi on (111) Si still shows good coverage epitaxial films with the PtSi pseudohexagonal cell being partially constrained to fit the hexagonal Si cell. These films were formed in vacuum with an anneal of 400 C to 650 C. lr response measurements revealed no improvement upon changing the substrate orientation from (100) Si (111) Si for PtSi films of similar thicknesses. The best C values were obtained on films formed on the (111) Si with values of about 19%/eV and a barrier value of 0.225 eV and a barrier value of 0.225 eV for 10A PtSi films. 80A PtSi films formed on both substrate orientations showed curvature on Folwer plots near the barrier value. When the film thickness decreases, this curvature disappeared and was accompanied by shifts in the extrapolated optical barrier as much as about .1eV.

Descriptors :   *PHOTOELECTRIC EMISSION, *INFRARED DETECTORS, BARRIERS, CIRCUIT INTERCONNECTIONS, DIFFUSION, FILMS, GATES(CIRCUITS), GRAIN STRUCTURES(METALLURGY), INTERFACES, INTERNAL, MEASUREMENT, METALS, MODELS, ORIENTATION(DIRECTION), RESPONSE, SCATTERING, SCHOTTKY BARRIER DEVICES, SEMICONDUCTORS, SUBSTRATES, THEORY, THICKNESS, THIN FILMS, VACUUM

Subject Categories : Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE