Patent ID: 6140169
Filing Date: 2000-10-31
Classification: H01L

Abstract:
A manufacturing method for a field effect transistor of the type in which a source electrode and a drain electrode are disposed on a channel layer composed of a Group-III nitride compound semiconductor containing nitride and at least one of the Group-III elements selected from the group consisting of gallium (Ga), aluminum (Al), boron (B), and indium (In), and a gate electrode is formed on said channel layer with a gate insulating film therebetween, said method comprising the steps of:forming a gate-insulating-film forming layer after said channel layer is formed;forming a dummy gate, which serves as said gate electrode, on said gate-insulating-film forming layer;forming side walls on lateral surfaces of said dummy gate; andforming said gate insulating film by selectively removing said gate-insulating-film forming layer using said dummy gate and said side walls as a mask.