METHOD FOR MANUFACTURING A TRANSISTOR DEVICE

摘要

A method for manufacturing a transistor device comprising a channel layer, the method comprising:
- providing a substrate;
- epitaxially growing a strained layer on the substrate (defect free);
- epitaxially growing the channel layer on the epitaxially grown strained layer.
- proving a gate structure on the channel layer,
- selectively etching into the channel layer and at least partially in the epitaxially grown strained layer, thereby using the gate structure as a mask, and thereby creating a protrusion extending from the substrate, the protrusion comprising a portion of the channel layer and at least an upper portion of the epitaxially grown strained layer, allowing elastic relaxation in the portions.