• 专利标题:   Method for manufacturing backside illuminated image sensor device, involves forming dielectric buffer layer on patterned conductive shielding layer, forming color filter layer on buffer layer, and forming microlens layer on filter layer.
  • 专利号:   US2022271071-A1
  • 发明人:   JENG C, HUANG Z, WEI C, CHANG S, CHIEN V
  • 专利权人:   TAIWAN SEMICONDUCTOR MFG CO LTD
  • 国际专利分类:   H01L027/146
  • 专利详细信息:   US2022271071-A1 25 Aug 2022 H01L-027/146 202271 English
  • 申请详细信息:   US2022271071-A1 US744175 13 May 2022
  • 优先权号:   US073580, US744175

▎ 摘  要

NOVELTY - Manufacturing a backside illuminated image sensor device involves forming a dielectric layer (120) on a back surface of a semiconductor substrate, where the semiconductor substrate has a pixel array (110) formed on a front surface of the semiconductor substrate; patterning the dielectric layer to form scribe lines (130) surrounding the pixel array; forming a conductive shielding layer on the dielectric layer; patterning the conductive shielding layer to expose the scribe lines; forming a dielectric buffer layer (150) on the patterned conductive shielding layer and the dielectric layer; forming a color filter layer (160) on the dielectric buffer layer; and forming a microlens layer (170) on the color filter layer. USE - The method is useful for manufacturing a backside illuminated image sensor device (claimed) i.e. charge-coupled device (CCD) or complementary metal oxide semiconductor (CMOS) image sensor, of a digital camera. ADVANTAGE - The sensor prevents the wafer from being damaged by the accumulated electrostatic charges in a form of arcing to decrease the yield of the backside illuminated (BSI) sensor. The sensitivity of each pixel in the CMOS image sensor is improved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method which involves forming a pixel array on a front-side of a substrate; depositing a dielectric layer on a backside of the substrate; etching scribe line regions in the dielectric layer; after etching the scribe line regions in the dielectric layer, forming one or more conductive shielding lines (140a) on the dielectric layer, the conductive shielding lines non-overlapping the pixel array; and forming a color filter layer overlapping the pixel array; and (2) a method which involves forming a pixel array on a substrate; depositing a dielectric layer on the substrate; patterning the dielectric layer to form scribe line regions in the dielectric layer; and forming one or more conductive shielding lines on the dielectric layer, the one or more conductive shielding lines each having an outermost side in vicinity of a boundary of the scribe line regions and an innermost side non-overlapping the pixel array. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a manufacturing process of a backside illuminated image sensor device with a conductive shielding layer. 110Pixel array 120Dielectric layer 130Scribe lines 150Dielectric buffer layer 160Color filter layer 170Microlens layer