Patent ID: 6300151
Filing Date: 2001-10-09
Classification: G02B,H01S

Abstract:
A method for manufacturing a laser diode chip comprising the steps of:(1) vapor-depositing a nitride thin film(Si3N4) on the surface of a wafer on which the n type InP, p type InP, n type InP, p type InP and InGaAs layers are successively laminated with the completion of the tertiary MOCVD growth, and etching the InGaAs layer by using the mixed solution of sulfuric acid, hydrogen peroxide and distilled water after opening an etching window by means of photolithography to form V-grooves as cutting sites with a view to control the size of laser diode chip within .+-.1 micron;(2) etching a part of InP layer as a current cut-off layer by using a solution based on a hydrochloric acid;(3) vapor-depositing a nitride thin film(SiNx) by using a PECVD process;(4) opening the electrode forming window to form electrodes by means of a photolithography and forming P type electrodes on the surface of the wafer;(5) forming a N type electrode on the back surface of the wafer after polishing the bottom surface and(6) manufacturing laser diode chips having a desired size by cutting the V-grooves on the chip set with a breaker, when the laser diode chip set with V-grooves is completed through the above described steps of (1) to (5).