Patent ID: 7687873
Filing Date: 2010-03-30
Classification: H01L,Y02E

Abstract:
1. A photodiode comprising: a semiconductor layer including a device forming area and a device isolation area that at least partially surrounds the device forming area; a device isolation layer formed in the device isolation area; a P+ diffusion layer formed in the device forming area; an N+ diffusion layer spaced away from the P+ diffusion layer and formed in the device forming area; a third diffusion layer formed in the device forming area located between the P+ diffusion layer and the N+ diffusion layer, the third diffusion layer comprising an impurity of the same type and at a lower concentration as one of the P+ diffusion layer and the N+ diffusion layer; silicide layers respectively formed at least in an upper portion of the P+ diffusion layer and at least in an upper portion of the N+ diffusion layer and respectively spaced away from a boundary between the third diffusion the P+ diffusion layer and a boundary between the third diffusion layer and N+ diffusion layer; an nMOS element and a pMOS element each having a source and a drain formed in a device forming area of the semiconductor layer and a gate electrode opposite to a channel region between the source and drain, with a gate oxide film interposing the channel region and gate electrode; and silicide layers respectively formed at least in an upper portion of the source and the drain of each of the nMOS element and the pMOS element.