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(Color online) Typical photograph of and a schematic cross section of the device. This device has two Al wires connected to the front surface of . The back surface contact was formed with In solder.
The current-voltage characteristics of as-grown and annealed samples measured at room temperature. The differential resistances of the samples are shown as well.
(Color online) Mapping of photoresponsivity under laser illumination. The wavelength and the output power of the laser were and , respectively. The spot size was approximately .
(a) Spectral response of as-grown and annealed samples, and (b) square root of the photocurrent per incident photon vs photon energy for the annealed sample.
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