Patent ID: 7608906
Filing Date: 2009-10-27
Classification: H01L

Abstract:
1. A multi-color photo detector comprising: a first photodiode having a first p-type layer and a first n-type layer, the first photodiode generates charge when illuminated with light photons of a first wavelength range; a second photodiode having a second p-type layer and a second n-type layer, the second photodiode generates charge when illuminated with light photons of a second wavelength range; a barrier layer separating the first photodiode from the second photodiode to prevent spectral cross-talk; and a readout integrated circuit electrically coupled to the first p-type layer of the first photodiode via a first metal interconnect and electrically coupled to the second p-type layer of the second photodiode via a second metal interconnect, the second metal interconnect traverses through the first photodiode and the barrier layer to contact the second p-type layer of the second photodiode, the second metal interconnect is separated from the first photodiode and the barrier layer by a first passivating insulator, and wherein the second metal interconnect traverses through the second n-type layer and the second p-type layer of the second photodiode, the first passivating insulator separates the second metal interconnect from the second n-type layer and the second p-type layer of the second photodiode, the second metal interconnect extends beyond the second p-type layer and contacts an exposed surface of the second p-type layer.