Logical functions in a tandem SiC device

• Wavelength controlled selective filters.
• WDM application.
• Logical functions NOT, AND, OR, XOR constructed with a single optical sensor.

This study demonstrates logical functions based on SiC technology. The device consists of a p-i’(a-SiC:H)-n/p-i(a-Si:H)-n heterostructure with low conductivity doped layers. Experimental optoelectronic characterization of the fabricated device is presented and shows the feasibility of tailoring channel bandwidth and wavelength by optical bias through illumination in the back and front sides with violet light.Two digital light signals are applied to the front side of the device while violet light steadily shines either at the back or front sides. Each digital light signal is composed by two wavelengths, one from the long and the other from the short visible wavelength range. One digital signal is the Red–Blue pair and the other the Green–Violet. The NOT logical function is shown with the Red–Blue pair likewise with the Green–Violet pair. The background biasing either at front or at the back side allows for an inverted signal or non inverted signal. Experimental results show and explain the interaction of two digital signal pairs and the identification of the logical AND, OR and XOR operations by the selection of the violet biasing illumination side.

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