Patent ID: 8193555

Claim:
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 polymer layer on said insulating layer; a metal layer on said second region of said metal trace, wherein said metal layer includes a portion in said polymer layer, 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; and a transparent substrate on a top surface of said polymer layer and over said multiple transistors, wherein an air space is between said insulating layer and said transparent substrate and over said multiple transistors, wherein a bottom surface of said transparent substrate provides a top wall of said air space, and said polymer layer provides a sidewall of said air space.