A novel symmetric metal/tunnel-barrier/silicon/tunnel-barrier/metal planar junction fast photodetector is described. The device exhibits an observed pulse width of about 45-ps full width at half-maximum in response to synchronously pumped mode-locked rhodamine 6G dye laser pulses of <10-ps duration at 6000-Å wavelength. Detection sensitivity and dark current level are uniquely controlled by adjusting the tunnel-barrier thicknesses, without affecting the response speed. The particular detector described here has a sensitivity of order 1/2 mA/mW in response to the cw HeNe laser wavelength, and a dark current below 1 nA at <20-V bias.
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Thaniyavarn et al. (1982) studied this question.
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