Accession Number : ADD014491

Title :   Sensitization Pretreatment of PB-Salt Epitaxial Films for Schottky Diodes by Sulfur Vapor Exposure.

Descriptive Note : Patent, Filed 19 Jul 89, patented 13 Feb 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Chu, Tak-Kin ; Santiago, Francisco

Report Date : 13 Feb 1990

Pagination or Media Count : 7

Abstract : This abstract discloses a process for preparing an infrared sensitive photodiode comprising the steps of: 1) forming by vacuum deposition an epitaxial layer of a semiconductor alloy material selected from the group consisting of Lead Selenide, Lead Telluride, PbSe(x)Te(1-x), Pb(y)Sn(1-y)Se, Pb(y)Sn(1-y)Te, Pb(y)Sn(1-y)Se(x)Te(1-x), Pb(z)Cd(l-z)Se, Pb(z) Cd(l-z)Te, and Pb(z)Cd(l-z)Se(x)Te(l-x), wherein ) 0x1,0y1, and 0=1, to cover at least a portion of the surface of a substrate composed of an infrared transparent single crystal material selected from the group consisting of alkali metal halides and alkaline earth halides; coating the epitaxial layer of semiconductor alloy material with a thin layer of a lead halide selected from the group consisting of Lead chloride, Lead bromide, Lead fluoride, and mixtures thereof by exposing the epitaxial layer alloy material to vapor of the lead halide in the presence of a gas selected from the group consisting of air, oxygen, and oxygen/inert gas mixtures; 3) vacuum depositing Pb metal onto a portion of the lead halide coated epitaxial layer of semiconductor alloy material to form a non-Ohmic Pb metal contact; and 4) forming an Ohmic contact on another portion of epitaxial layer of semiconductor alloy materials. Patents. (AW)

Descriptors :   *EPITAXIAL GROWTH, *LEAD COMPOUNDS, *PATENTS, *PHOTODIODES, *SCHOTTKY BARRIER DEVICES, *SELENIDES, *TELLURIDES, *SEMICONDUCTING FILMS, ALKALI METALS, ALKALINE EARTH COMPOUNDS, ALLOYS, BROMIDES, CHLORIDES, COATINGS, ELECTRIC CONTACTS, EXPOSURE(GENERAL), FLUORIDES, GASES, HALIDES, INERT MATERIALS, INFRARED RADIATION, LAYERS, METAL CONTACTS, MIXTURES, OXYGEN, SEMICONDUCTORS, SENSITIVITY, SENSITIZING, SUBSTRATES, SULFUR, THIN FILMS, VACUUM DEPOSITION, VAPOR DEPOSITION, SINGLE CRYSTALS, TIN COMPOUNDS, CADMIUM COMPOUNDS

Subject Categories : Solid State Physics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE