Patent ID: 6239033
Filing Date: 2001-05-29
Classification: B82Y,H01L,H01S,Y10S

Abstract:
A manufacturing method of a semiconductor device, comprising the steps of:making a device using nitride III-V compound semiconductors on one major surface of a single-crystal substrate made of a material different from nitride III-V compound semiconductors;thinning said single-crystal substrate by processing the other major surface of said single-crystal substrate by lapping using an abrasive liquid containing an abrasive material of diamond abrasive grains while reducing the grain size of said abrasive material in plural steps; andremoving a strained layer produced on said other major surface of said single-crystal substrate during said lapping by etching said other major surface of said single-crystal substrate after said lapping by using an etchant containing phosphoric acid or phosphoric acid and sulfuric acid as its major component and heated to 150 to 450.degree. C.