Patent ID: 9136407
Filing Date: 2015-09-15
Classification: H01L

Abstract:
1. A method of manufacturing a solid-state image sensor including a first charge accumulation region, a second charge accumulation region positioned adjacent to the first charge accumulation region, a first transfer gate positioned adjacent to the first charge accumulation region and configured to transfer a charge in the first charge accumulation region, and a second transfer gate positioned adjacent to the second charge accumulation region and configured to transfer a charge in the second charge accumulation region, the first accumulation region and the second accumulation region being positioned between a region below the first transfer gate and a region below the second transfer gate, the method comprising: preparing a semiconductor substrate provided with the first transfer gate and the second transfer gate; forming, on the semiconductor substrate, a mask pattern including a first opening for implanting ions into a first region where the first charge accumulation region is to be formed, a second opening for implanting ions into a second region where the second charge accumulation region is to be formed, and a wall portion which is positioned between the first opening and the second opening, the first region including a first portion which is arranged below the first transfer gate, and the second region including a second portion which is arranged below the second transfer gate; and implanting ions into the semiconductor substrate through the first opening and the second opening to form the first charge accumulation region and the second charge accumulation region, wherein the implanting ions into the semiconductor substrate includes: a first implantation of implanting ions into a part of the first region, which includes the first portion, and a part of the second region; and a second implantation of implanting ions into a part of the first region, and a part of the second region, which includes the second portion.