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R&D
Harvard University scientists have produced nanowire lasers based on the wide bandgap semiconductor, cadmium sulphide
Harvard University scientists have produced nanowire lasers based on the wide bandgap semiconductor, cadmium sulphide (Nature, January 16, 2002). The emitted light is in the 495-500nm wavelength (blue-green) range. The wire diameters are 80-200nm. Pumping was achieved in both optical and electrical modes. Electrical pumping is tricky with the CdS material. The scientists assembled n-type CdS nanowire cavities onto p-type silicon planar substrates. Layers of aluminium oxide, titanium and gold were deposited on top of the wires. This structure produces a pn heterojunction.
