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P-N junction01:11

P-N junction

536
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
536
Biasing of P-N Junction01:16

Biasing of P-N Junction

539
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Updated: Jul 6, 2025

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Solution-Processed Sb2S3-Based Heterojunction for Self-Powered Broad Band Weak Light Detection.

Akshay Vishwanathan Vidyanagar1, S Venkataprasad Bhat1

  • 1Green Energy Materials Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603 203, India.

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|January 8, 2024
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Researchers developed a novel, low-temperature solution-processed antimony sulfide (Sb2S3) photodetector. This self-powered device demonstrates high performance for white light detection, paving the way for new optoelectronic applications.

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antimony sulfidephotodetectorprecursor inkself-poweredsolar trackingweak light

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Photovoltaics

Background:

  • Antimony sulfide (Sb2S3) is a promising solar absorber material.
  • Its use in white light photodetectors is underexplored.
  • Low-temperature, solution-processed films are desirable for cost-effective fabrication.

Purpose of the Study:

  • To develop a self-powered photodetector using Sb2S3.
  • To investigate the performance of Sb2S3 for white light detection.
  • To demonstrate a practical application of the photodetector.

Main Methods:

  • Fabrication of Sb2S3 thin films via single-step spin coating of a novel precursor ink.
  • Preparation of a TiO2/Sb2S3 heterojunction device.
  • Characterization of the photodetector's performance under white light illumination.

Main Results:

  • A TiO2/Sb2S3 heterojunction device achieved a power conversion efficiency of 1.22%.
  • The self-powered photodetector exhibited a high on/off ratio of 2.2 × 104 under 1 sun illumination.
  • The device demonstrated a fast response time of 98 ms and detected both strong and weak white light.

Conclusions:

  • Low-temperature solution-processed Sb2S3 is suitable for self-powered photodetectors.
  • The developed photodetector shows excellent performance for white light detection.
  • The device has potential for applications like sunlight tracking systems.