Patent ID: 9601385
Date: 2017-03-21
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor device comprising: providing a material stack comprising, from bottom to top, a semiconductor substrate and a base semiconductor layer of a strained semiconductor material; forming a plurality of mandrels by etching an upper portion of the base semiconductor layer, wherein the mandrels are located on a remaining unetched portion of the base semiconductor layer, and wherein each mandrel and the remaining unetched portion of the semiconductor base layer comprise a semiconductor material that is relaxed relative to the strained semiconductor material of the base semiconductor layer prior to the etching; depositing a first semiconductor material directly on a pair of opposing semiconductor sidewalls of the mandrels and within a first region of the semiconductor substrate to form first strained semiconductor material layers directly on the opposing semiconductor sidewalls of the mandrels within the first region; and removing the mandrels to form semiconductor fins comprising the first strained semiconductor material layers.