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In this research, a highly sensitive gate/body-tied metal-oxide-semiconductor fieldeffect transistor (MOSFET)-type photodetector with a wavelength-selective metal grid structure was designed and fabricated using 0.18-μm standard complementary metaloxide-semiconductor technology. This device is composed of a floating gate that is tied to a well and a wavelength-selective metal grid is placed on top of each photodetector. The designed metal grid structure included one-dimensional and two-dimensional patterned metal layers. The amplified photocurrent of the gate/body-tied MOSFETtype photodetector was found to be more than 1000-fold that of a conventional n+/p-sub photodiode with the same area. To demonstrate the wavelength selectivity, we measured the drain current and transmittance of the photodetector as a function of wavelength.

sensors and materials

Highly Sensitive Gate/Body-Tied Metal-Oxide-Semiconductor Field-Effect Transistor-Type Photodetector with Wavelength-Selective Metal Grid Structure Using Standard Complementary Metal-Oxide-Semiconductor Technology