Patent ID: 7402469
Filing Date: 2008-07-22
Classification: H01L

Abstract:
1. A method for selectively marking a region of integrated circuit (IC), the method comprising: providing an IC die with a first region located on a backside surface of a bulk silicon (Si) layer; forming a semi-transparent film overlying the bulk Si layer, semi-transparent to light having a first wavelength; irradiating the semi-transparent film with light having the first wavelength; in response to irradiating the semi-transparent film with a first power density, locating the IC die first region; in response to irradiating the semi-transparent film with a second power density, greater than the first power density, marking a region of the semi-transparent film by ablating a region of semi-transparent film overlying the IC die first region; selectively etching a region of the bulk Si layer underlying the semi-transparent film ablated region as follows: in response to the etching, exposing the IC die first region.