Patent ID: 8471939
Filing Date: 2013-06-25
Classification: H01L

Abstract:
1. An image sensor, comprising: a first sensor layer having a first array of pixels, each pixel including a photodetector for collecting charge in response to incident light, a charge-to-voltage conversion mechanism, and a transfer gate for selectively transferring charge from the photodetector to the charge-to-voltage mechanism, the first sensor layer having a thickness to collect light with a first preselected range of wavelengths; a second sensor layer situated over the first sensor layer, the second sensor layer having a second array of pixels, each pixel including a photodetector for collecting charge in response to incident light, a charge-to-voltage conversion, and a transfer gate for selectively transferring charge from the photodetector to the charge-to-voltage mechanism, the second sensor layer being of the same material as the first sensor layer and having a thickness to collect light with a second preselected range of wavelengths; a color filter array situated over the second sensor layer, wherein the color filter array excludes portions that filter out at least one of the first preselected range of wavelengths and the second preselected range of wavelengths; a circuit layer separate from the first and second sensor layers and situated below the first sensor layer, the circuit layer having support circuitry for the pixels of the first and second sensor layers; and interlayer connectors between the pixels of the first and second layers and the support circuitry.