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In this letter, we report an analog small signal amplifier based on semiconducting black phosphorus (BP), the most recent addition to the family of 2D crystals. The amplifier, consisting of a BP load resistor and a BP field-effect transistor (FET), was integrated on a single flake. The gain of the amplifier was found to be $\sim 9$ and it remained undistorted for input signal frequencies up to 15...
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