Patent ID: 9653584
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A method to form electronic device fins comprising: etching away a thickness of a substrate between first top surface areas of a substrate of a first single crystal material to form wide electronic device fins under the first top surface areas and to form trenches between the first top surface areas, the wide electronic device fins having wide single crystal top surfaces and wide sidewalls; then forming a first thickness of a trench oxide material in the trenches and below the first top surface areas; and then etching a thickness of the wide single crystal top surfaces and the wide sidewalls of the wide electronic device fins to form narrower electronic device fins from the wide fins, the narrower electronic device fins having narrower single crystal top surfaces and narrower sidewalls with a same single crystal lattice as the wide single crystal top surfaces and the wide sidewalls, wherein etching the thickness of the wide single crystal top surfaces and the wide sidewalls includes removing a thickness of between a 1 nm and 15 nm of the wide single crystal top surfaces and the wide sidewalls.