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Dark current curves of the two samples at 77 K.
(a) The top two curves are the photocurrent spectra of sample a at 2.0 V and −0.75 V, respectively; the bottom curve is the photocurrent spectrum of sample b at 1.0 V. (b) and (c) are the dependence of photocurrent intensity on the applied positive bias voltages for the and peaks, respectively, for sample a.
Proposed conduction band diagram of sample a.
Photocurrent ratio of the peak over the peak vs bias voltages. The inset is the simulated ratio at different .
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