Patent ID: 9190433
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A stacked photodiode structure, comprising: a first-conductivity-type substrate, having a first surface and a grounding terminal; a second-conductivity-type well region, formed in the first-conductivity-type substrate and adjacent to the first surface; and a first-conductivity-type well region, formed in the second-conductivity-type well region and adjacent to the first surface; wherein a first PN junction between the first-conductivity-type well region and the second-conductivity-type well region generates free electrons responsive to mainly visible light spectrum incident from the first surface into the stacked photodiode structure; wherein a second PN junction between the second-conductivity-type well region and the first-conductivity-type substrate generates free holes and free electrons responsive to mainly IR light spectrum incident from the first surface into the stacked photodiode structure.