Patent ID: 9613912
Date: 2017-04-04
CPC Classifications: H01L

Claim:
1. A method of making a semiconductor device, comprising: providing a wafer comprising a plurality of semiconductor die, wherein each semiconductor die comprises an active surface and a backside opposite the active surface; forming a multi-film material over the wafer and over a backside of each of the plurality of semiconductor die within the wafer with a coating machine, the multi-film material comprising a non-photosensitive layer and a photosensitive layer, wherein a thickness of the photosensitive layer is less than or equal to a thickness of the non-photosensitive layer; forming an identifying mark within the photosensitive layer for each of the plurality of semiconductor die by removing a portion of the photosensitive layer with a digital exposure machine and a developer, wherein a thickness of the identifying mark is less than or equal to 50 percent of a thickness of the photosensitive layer, the identifying mark encoding unique product information; curing the photosensitive layer; and singulating the wafer into a plurality of semiconductor devices.