Wafer inspection apparatus and method
US11579096B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2020 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Mar 22, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8883
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thickness estimating apparatus includes a transfer robot, a light source, a camera, a memory and a controller. The memory stores a thickness predicting model generated based on a data set including a thickness of at least one of a test wafer corresponding to the wafer or a test element layer formed on the test wafer, and the thickness predicting model being trained to minimize a loss function of the data set. The controller applies pixel data, which is acquired from at least one pixel selected from a plurality of pixels included in a captured image, to the thickness predicting model, to predict a thickness of at least one of the wafer or an element layer formed on the wafer in a position corresponding to a position of the selected pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.