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(Color online) (a) Schematic of the photodetector device structure showing embedded nanoparticles. (b) Absorption and extinction spectra of nanoparticles on glass and micrographs of Ag islandised films formed between the Au contacts before CQD PbS deposition, showing the size and shape distribution of the Ag nanoparticles (inset).
(Color online) Responsivity (a) and responsivity enhancement (b) of the three different thicknesses photoconductive detectors at 10 V(10 kV/cm). Spectra are shown for samples with (solid lines) and without (dashed lines) embedded Ag MNPs.
(Color online) Absorption (a) and absorption enhancement (b) of PbS-CQD films on glass for three different thicknesses. Spectra are shown for samples with (solid lines) and without (dashed lines) embedded Ag MNPs. (c) Number of TE modes in a planar PbS-CQD film in air, calculated at each wavelength for different film thicknesses (an equivalent calculation can be performed for TM modes, giving similar results). (Inset) The calculated angular distribution of light scattered at resonance (λSPR = 840 nm) by a single, flattened Ag hemisphere with d = 100 nm and h = 30 nm (solid lines), compared to the propagation angles for allowed TE and TM modes in the PbS-CQD waveguide for different thicknesses (broken lines), at the same wavelength. The loss cone for a PbS-CQD/air interface is also shown (dotted lines).
(Color online) Responsivity of 420 nm thick devices with and without mirror (square and circle marked lines, respectively) with and without MNPs (solid and dashed lines, respectively) measured at 10 V bias. The inset shows a schematic of the measurement with mirror.
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