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Figure 1 | Nanoscale Research Letters

Figure 1

From: Photovoltaic Ge/Si quantum dot detectors operating in the mid-wave atmospheric window (3 to 5 μ m)

Figure 1

Photocurrent spectra and specific detectivity. Of Ge/Si QD samples where the capping temperature Tcap was systematically varied. (a) Series of responsivity spectra measured at temperature of 90 K with no applied bias (U b = 0 V). The spectra have been vertically displaced for clarity. (b) Detectivity as a function of applied bias. The measurement temperature is 90 K. For the samples with Tcap = 300°C, 500°C, and 600°C, the data were taken at λ = 3 μ m. For the samples with Tcap = 700°C and 750°C, the peak detectivity is shown.

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