Black phosphorus mid infrared photodetector with circular Au/Pd antennas

Document Type : Articles


1 Department of Electrical Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

2 Department of Physics, South Tehran Branch, Islamic Azad University, Tehran, Iran


Black phosphorus has been considered as one
of the most capable two-dimensional materials for use in
optoelectronic nanodevices due to its intrinsic layered
nature structure, high mobility of carrier, and tunable
bandgap. But its low light absorption prevents its use in
high-efficiency photodetectors. In this study, the circular
Au/Pd antenna-assisted black phosphorus mid-infrared
photodetector which significantly improves the detection
performance in comparison with BP photodetectors
without antenna has been proposed. By integrating a
circular Au/Pd antenna on the BP surface, the light-BP
interaction was significantly increased. The simulation
results demonstrate that metallic antenna structures
improve both light absorption and photocarrier collection
in BP phosphorus detectors. The numerical result shows
that the photocurrent of the mid-infrared antenna-assisted
BP detector was 5 times larger than that of BP
photodetector without antennas.


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