Patent ID: 8933494
Filing Date: 2015-01-13
Classification: H01L

Abstract:
1. A pixel cell, comprising: a storage transistor disposed in a semiconductor substrate, the storage transistor including a storage gate disposed over the semiconductor substrate, a deep implant storage region having a first polarity implanted in a semiconductor substrate under the storage transistor gate to store image charge accumulated by a photodiode disposed in the semiconductor substrate; a transfer transistor disposed in the semiconductor substrate and coupled between the photodiode and an input of the storage transistor to selectively transfer the image charge from the photodiode to the storage transistor, the transfer transistor including a transfer gate disposed over the semiconductor substrate; an output transistor disposed in the semiconductor substrate and coupled to an output of the storage transistor to selectively transfer the image charge from the storage transistor to a readout node, the output transistor including an output gate disposed over the semiconductor substrate; a first shallow implant region having the first polarity and implanted in the semiconductor substrate under a first spacer region between the transfer gate and the storage gate; and a second shallow implant region having the first polarity and implanted in the semiconductor substrate under a second spacer region between the storage gate and the output gate.