Patent ID: 7521315
Filing Date: 2009-04-21
Classification: H01L

Abstract:
1. A method for fabricating an image sensor, comprising: forming a trench for a device isolation in a single crystal silicon substrate; forming an insulation layer filling the trench; planarizing the insulation layer filling the trench until the insulation layer is aligned with a top surface of the substrate; forming a transfer gate apart from the trench on the substrate; forming an inter-layer insulation layer on a surface of the substrate including the transfer gate; forming an opening by etching predetermined portions of the substrate and the inter-layer insulation layer between the trench and the transfer gate; forming an amorphous silicon layer filling the opening; planarizing the amorphous silicon layer filling the opening until the amorphous silicon layer is aligned with the top surface of the substrate; recessing the planarized amorphous silicon layer the top surface of the substrate; and forming a photodiode in the recessed amorphous silicon layer.