Mr. Niall G. Coakley Profile

Niall G. Coakley

Lecturer and Researcher at Technological Univ Dublin

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Proceedings Article | 8 October 2007 Paper

Optimisation of a Geiger mode avalanche photodiode imaging pixel based on a hybrid bulk SOI CMOS process

Niall Coakley, Aoife Moloney, Andreas Schwarzbacher

Proceedings Volume 6737, 67370V (2007) https://doi.org/10.1117/12.737851

KEYWORDS: Transistors, Photodetectors, Sensors, Picosecond phenomena, Resistors, CMOS technology, Resistance, Avalanche photodiodes, Capacitance, Photon counting

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Single photon detection has a wide variety of scientific and industrial applications including optical time domain reflectometry, astronomy, spectroscopy, defect monitoring of Complementary Metal Oxide Semiconductor (CMOS) circuits, fluorescence lifetime measurement and imaging. In imaging applications, the dead time is the time during which the detector is inhibited after a photon has been detected. This is a limiting factor on the dynamic range of the pixel. The rate of photon detection will saturate if the dead time is too large. Time constants generated by Metal Oxide Semiconductor (MOS) transistor bulk and sidewall capacitances adversely affect the dead time of pixels developed in conventional CMOS technology. In this paper, a novel imaging pixel configuration based on a Geiger Mode Avalanche Photodiode (GMAP) and fabricated using a dedicated hybrid bulk Silicon On Insulator (SOI) CMOS process is presented. The GMAP is fabricated in the bulk layer and the CMOS circuitry is implemented in the upper SOI layers. As a result, bulk and sidewall capacitance effects are significantly reduced. As both the diode and the CMOS transistors are on the same wafer there is a reduction in pixel area and an additional reduction in the parasitic capacitance effects. This leads to a significant improvement in pixel performance. Pixels incorporating 5 micron and 10 micron diameter GMAPs have been simulated. The circuits were optimised with a view to maximising the photon count rate. Results show a significant improvement in the dead time with values of 14 nanoseconds and 15 nanoseconds being observed for the 5 micron and 10 micron GMAPs respectively.

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