A germanium photodetector array for the near infrared monolithically integrated with silicon CMOS readout electronics |
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Authors: | Gianlorenzo Masini Valentino Cencelli Lorenzo Colace Francesco DeNotaristefani Gaetano Assanto |
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Affiliation: | a INFM RM3 and Department of Electronic Engineering, University Roma Tre, Via della Vasca Navale, 84-00146, Roma, Italy;b INFN Roma Tre, Via della Vasca Navale, 84-00146, Roma, Italy |
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Abstract: | Near infrared (NIR) detectors, operating in the 1.3–1.6 μm region, are key elements in a number of applications ranging from optical communications to remote sensing. InGaAs and Ge are currently the materials of choice for the fabrication of NIR detectors due to their good absorption and transport properties. However, as the required performances increase (bit-rate in optical communications, number of pixels in imaging, etc.), it becomes more and more important to reduce the separation from detectors and driving/biasing and amplifying electronics, by integrating the two components on the same chip.We demonstrate an array of NIR detectors monolithically integrated with standard silicon CMOS readout electronics. The employed low temperature process allowed the integration of the detectors as the last step of chip fabrication. The integrated micro-system consists of a linear array of 120×120 μm2 pixels, an analog CMOS multiplexer and a transimpedance amplifier. The chip exhibits a good photoresponse in the NIR, with responsivities as high as 43 V/W at 1.3 μm, dark currents of 1 mA/cm2 and inter-pixel cross-talk better than −20 dB. |
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Keywords: | Near infrared photodetectors Integrated optoelectronics Germanium photodiode |
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