Being direct band-gap materials, carbon nanotubes have a potential to be efficient spectrum detection material. By depositing the carbon nanotubes on the substrate surface using chemical vapor deposition growth methods, a carbon nanotube-based device is fabricated with micromachined techniques. The structure of the carbon nanotube-based device is characterized using scanning electron microscope image. The spectra of carbon nanotube-based device are measured. The photocurrent as a function of wavelength reveals a broad absorption at wavelength from 500 to 1000 nm, showing the potential application in wide-range spectrum detection.
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