Patent ID: 8853754
Filing Date: 2014-10-07
Classification: H01L

Abstract:
1. A light sensor chip comprising: a semiconductor substrate; multiple transistors each including a diffusion or doped area in said semiconductor substrate and a gate over a top surface of said semiconductor substrate; a first dielectric layer over said top surface of said semiconductor substrate; an interconnection layer over said first dielectric layer; a second dielectric layer over said interconnection layer and over said first dielectric layer; a metal trace over said second dielectric layer, wherein said metal trace has a width smaller than 1 micrometer; an insulating layer on a first region of said metal trace, over said interconnection layer and over said first and second dielectric layers, wherein an opening in said insulating layer is over a second region of said metal trace, and said second region is at a bottom of said opening; a metal layer on said second region of said metal trace, wherein said metal layer is connected to said second region of said metal trace through said opening, wherein said metal layer has a thickness between 3 and 100 micrometers and a width between 5 and 100 micrometers; a polymer layer under a bottom surface of said semiconductor substrate; and a transparent substrate on a bottom surface of said polymer layer, under said bottom surface of said semiconductor substrate and under multiple transistors, wherein an air space is between said semiconductor substrate and said transparent substrate and under said multiple transistors, wherein a top surface of said transparent substrate provides a bottom wall of said air space, and said polymer layer provides a sidewall of said air space.