Patent ID: 7776679

Claim:
A method for manufacturing silicon wells of two crystallographic orientations and having smooth upper surfaces, in a silicon support, comprising the successive steps of: forming a silicon layer having a first crystallographic orientation on a silicon substrate having a second crystallographic orientation; forming insulating walls which extend at least down to a border between the silicon substrate and the silicon layer, the insulating walls defining wells; performing, in at least one well, a chemical vapor etch of the silicon layer by means of hydrochloric acid, in an epitaxy reactor, at a temperature ranging between 700° C. and 950° C.; and performing, in the at least one well, a vapor-phase epitaxy on the silicon substrate in the presence of a precursor of silicon and hydrochloric acid, at a temperature ranging between 700° C. and 900° C. and up to the upper surface of the silicon layer, this epitaxy being performed in said epitaxy reactor.