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A 400mum times 400mum sized square quantum-well infrared photodetector with 30 periods of the GaAs/Al0.3Ga0.7 As multiple quantum well has been prepared on patterned (001) GaAs substrate. The absorption spectrum at room temperature with normal incidence geometry is peaked at 9mum with a full width at half maximum (FWHM) of 3.7 mum. Dark current with influence of 300K background was measured at room...
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