公开(公告)号：US10157956B2

公开(公告)日：2018-12-18

申请号：US15477191

申请日：2017-04-03

Applicant: INSTITUTE OF MICROELECTRONICS, CHINESE ACADEMY OF SCIENCES

Inventor： Hushan Cui ,  Jinjuan Xiang ,  Xiaobin He ,  Tao Yang ,  Junfeng Li ,  Chao Zhao

IPC: H01L21/00 ,  H01L27/146 ,  H01L31/0216 ,  H01L31/0232

Abstract: A method for monolithic integration of a hyperspectral image sensor is provided, which includes: forming a bottom reflecting layer on a surface of the photosensitive region of a CMOS image sensor wafer; forming a transparent cavity layer composed of N step structures on the bottom reflecting layer through area selective atomic layer deposition processes, where N=2m, m≥1 and m is a positive integer; and forming a top reflecting layer on the transparent cavity layer. With the method, non-uniformity accumulation due to etching processes in conventional technology is minimized, and the cavity layer can be made of materials which cannot be etched. Mosaic cavity layers having such repeated structures with different heights can be formed by extending one-dimensional ASALD, such as extending in another dimension and forming repeated regions, which can be applied to snapshot hyperspectral image sensors, for example, pixels, and greatly improving performance thereof.