Patent ID: 9035364
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A method for fabricating an active device, comprising: forming a buffer layer on a substrate; forming a channel material layer on the buffer layer; forming a channel, wherein the buffer layer having a positioning region, a thickness of a portion of the buffer layer in the positioning region is greater than a thickness of a portion of the buffer layer outside the positioning region, and the channel is disposed on the buffer layer and in the positioning region, and wherein the channel and a portion of the buffer layer below the channel together form an alignment mark corresponding to the positioning region; after the step of forming the alignment mark, forming a gate insulation layer entirely covering the channel and the buffer layer so that light transmittances of the positioning region and outside the positioning region are different; using the alignment mark by the different light transmittances to form a gate on the gate insulation layer which is entirely covering the channel and the buffer layer; and forming a source and a drain that are above the channel and electrically connected to the channel.