Patent ID: 7906409
Filing Date: 2011-03-15
Classification: H01L

Abstract:
1. A device manufacturing method comprising: a peeling buffer layer forming step of forming a peeling buffer layer on an underlying substrate; a mask pattern forming step of forming, on the peeling buffer layer, a mask pattern which partially covers the peeling buffer layer; a growth step of growing a group III nitride crystal from regions exposed by the mask pattern on a surface of the peeling buffer layer, thereby forming a structure in which a plurality of crystal members are arranged with gaps therebetween so as to partially cover the peeling buffer layer and the mask pattern; a channel forming step of forming a channel, to supply a second etchant for the peeling buffer layer to the peeling buffer layer, by selectively etching the mask pattern using a first etchant for the mask pattern; and a separation step of separating the plurality of crystal members from the underlying substrate and separating the plurality of crystal members from each other by supplying the second etchant to the peeling buffer layer through the gaps and the channel and selectively etching the peeling buffer layer.