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. 2014 Nov 19;4:7103. doi: 10.1038/srep07103

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(a) I–V characteristics of two reference samples and three different photodetectors with Au nanoislands. Different sized nanoislands are formed by annealing a flat Au layer at different temperatures: 300°C, 450°C, and 600°C. (b) Measured photoresponsivity spectra of the samples. AZO reference has no photoresponse for λ > 1200 nm. The other samples show sub-bandgap photoresponse by the internal photoemission process. The excitation of surface plasmons on nanoislands significantly increases the photoresponse with surface plasmon assisted hot electron generation mechanism.