Patent ID: 9064764
Filing Date: 2015-06-23
Classification: H01L

Abstract:
1. A light trapping device, comprising: at least one light sensitive pixel having a light incident surface, a backside surface opposite the light incident surface, and a peripheral sidewall disposed into at least a portion of the pixel and extending at least substantially around the pixel periphery; a backside light trapping material substantially covering the backside surface; and a peripheral light trapping material substantially covering the peripheral sidewall, wherein at least one of the backside light trapping material and the peripheral light trapping material includes a high refractive index material sandwiched between two low refractive index materials, wherein at least one of the two low refractive index materials is doped with a dopant to create a surface field, and wherein light contacting the backside light trapping material or the peripheral light trapping material is reflected back toward the pixel.