International Business Machines Corporation
Optical chip ID definition using nanoimprint lithography

Abstract:

An optically readable chip ID is provided to an imprintable material that is formed as a last level of an integrated circuit (IC) chip using nanoimprint lithography. The nanoimprint lithography process provides an array of indentations into the imprintable material that is typically arranged in a hexadecimal pattern. The hexadecimal pattern includes one or more optically readable characters which combine to encode chip location identification data. The chip location identification data identifies a unique location of the product chip on a wafer prior to dicing.