METHOD FOR PRODUCING CMOS TRANSISTOR GATE REGIONS Russian patent published in 2007 - IPC H01L21/28 

FIELD: microelectronics; complementary metal-oxide-semiconductor transistors.

SUBSTANCE: proposed method for producing CMOS transistor gate regions includes formation of regions of second polarity of conductivity, insulator, and gate silicon dioxide in substrate of first polarity of conductivity, deposition of polycrystalline silicon layer, its doping, formation of gate regions of p- and n-channel transistors, thermal cleaning in trichloroethylene and oxygen, deposition of separating silicon dioxide, modification, formation of drain and source regions of both polarities of conductivity, thermal cleaning in trichloroethylene and oxygen, deposition of pyrolytic insulating silicon dioxide, its modification by thermal firing in trichloroethylene and oxygen, opening of contact windows, metal deposition, and process operations (removal of natural silicon dioxide, formation of gate silicon dioxide, formation of polycrystalline silicon layer) conducted within single vacuum cycle of one reactor, whereupon polycrystalline silicon layer is doped.

EFFECT: improved and regulated electrophysical properties of gate silicon dioxide enabling enhancement of threshold voltage reproducibility and yield.

4 cl, 3 dwg