Patent ID: 7642117
Filing Date: 2010-01-05
Classification: H01L

Abstract:
1. A method comprising: forming a plurality of photodiodes on a semiconductor substrate; forming a color filter layer over the semiconductor substrate such that respective color filters of the color filter layer correspond to locations of respective photodiodes; forming an overcoat layer over the color filter layer; selectively removing portions of the overcoat layer to a prescribed thickness from a surface of the color filter layer to correspond to locations of the respective photodiodes to form trenches having a substantially rounded shape over corresponding photodiodes; and forming microlenses, each having a convex lens shape, inside each of the trenches wherein the forming microlenses comprises coating a resist on a surface of the trenches, selectively patterning the resist to form microlens patterns, and performing reflow on the microlens patterns at a prescribed temperature, wherein the microlens patterns are formed only in the trench.