Patent ID: 9704905
Date: 2017-07-11
CPC Classifications: H01L,H04N

Claim:
1. A solid-state image sensor which includes a semiconductor layer having a first surface and a second surface, comprising: charge accumulation region pairs which are arranged between the first surface and the second surface, one of the charge accumulation region pairs including charge accumulation regions to accumulate a charge; a transfer gate which is arranged on a side of the first surface so that the transfer gate transfers the charge; microlenses which are arranged on a side of the second surface so that one of the microlenses is assigned to the one of the charge accumulation region pairs; an intra-pair isolation region which is arranged between the charge accumulation regions of the one of the charge accumulation region pairs; and an inter-pair isolation region which is arranged between the charge accumulation region pairs, wherein a first potential barrier formed by the intra-pair isolation region is lower than a second potential barrier formed by the inter-pair isolation region.