Methods for marking a packaged semiconductor die including applying tape and subsequently marking the tape
US7094618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2004 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Mar 26, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S438/977
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
The present invention provides a method and apparatus for marking a semiconductor wafer or device. The method and apparatus have particular application to wafers or devices which have been subjected to a thinning process, including backgrinding in particular. The present method comprises reducing the cross-section of a wafer or device, applying a tape having optical energy-markable properties over a surface or edge of the wafer or device, and exposing the tape to an optical energy source to create an identifiable mark. A method for manufacturing an integrated circuit chip and for identifying a known good die are also disclosed. The apparatus of the present invention comprises a multilevel laser-markable tape for application to a bare semiconductor die. In the apparatus, an adhesive layer of the tape provides a homogenous surface for marking subsequent to exposure to electromagnetic radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.