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JNCASR scientists fabricate energy-efficient photodetector for security application

JNCASR scientists fabricate energy-efficient photodetector for security application

An economical and energy-efficient thin slice-based photodetector of wafer-scale has been fabricated by using gold – silicon interface by the scientists working at the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) for security applications.

Key Points:

  • Photodetectors are employed in the detection of light and operating several applications, which range from detecting radiation from the outer galaxy to automatic light control in supermarkets.
  • The high material cost and the complicated fabrication process involved in making high-performance detectors make them non-feasible and unaffordable for daily use.
  • The JNCASR scientists have fabricated a gold (Au)– silicon (n-Si) interface, which depicted increased sensitivity for light implying photodetection action.
  • The galvanic deposition, which is a technique for electroplating of metals, where electrolytes, which contain the metals to be deposited as ions, was utilized for depositing the gold-silicon interface.
  • Moreover, a nanostructured gold film was also deposited on top of p-type silicide, which acts as a charge collector.
  • Since the technique is electrolyte based, it is highly economical and provides for the fabrication of large-areas without compromising the response of the detector.
  • The metal nanostructures increase the performance of the detector by trapping the incoming light and also shows long-term environmental stability.
  • The device covers a broad spectral range from Ultraviolet to Infrared.

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