Method of manufacturing a wafer
US7407548B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2004 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Jul 28, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/02532
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of manufacturing a wafer comprising a single crystalline bulk substrate of a first material and at least one epitaxial layer of a second material which has a lattice different from the lattice of the first material. The present invention provides a method for manufacturing a wafer in which a layer which is lattice-mismatched with the substrate can be grown on the substrate with a high effectiveness and high quality at a low cost. A roughening step is included for roughening the surface of the bulk substrate and a growing step is included for growing the second material on the rough surface with a reduced number of threading dislocations and an enhanced strain relaxation compared to a second material that is epitaxially grown on a polished surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.