Thermal flux laser annealing for ion implantation of semiconductor P-N junctions
US7135392B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2005 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Jul 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/405
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for forming P-N junctions in a semiconductor wafer includes ion implanting dopant impurities into the wafer and annealing the wafer using a thermal flux laser annealing apparatus that includes an array of semiconductor laser emitters arranged in plural parallel rows extending along a slow axis, plural respective cylindrical lenses overlying respective ones of the rows of laser emitters for collimating light from the respective rows along a fast axis generally perpendicular to the slow axis, a homogenizing light pipe having an input face at a first end for receiving light from the plural cylindrical lenses and an output face at an opposite end, the light pipe comprising a pair of reflective walls extending between the input and output faces and separated from one another along the direction of the slow axis, and scanning apparatus for scanning light emitted from the homogenizing light pipe across the wafer in a scanning direction parallel to the fast axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.