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Lead selenide nanocrystals were coupled with the interdigital gold electrodes to create a dissimilar material that is used for detecting near-infrared light at room temperature. The photoluminescence spectrum of the nanocrystals showed a narrow peak at 1.6 μm. A device with 10-μm electrode spacing exhibits excellent photoresponse with an onset at 1.8 μm and detectivity in the order of 3 × 109 cmHz...