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Selective Photodetection at Specific Wavelengths in Filterless Single-Channel Field-Effect Transistors.

Lin He1,2, Zhongsheng Ge1, Andraž Mavrič3

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.

ACS Applied Materials & Interfaces
|September 25, 2025
PubMed
Summary

This study introduces a novel photodetector using organic semiconductors and perovskites for multiwavelength visible light detection. The device can differentiate colors and detect light intensity, enhancing optoelectronic device capabilities.

Keywords:
multifunctional sensingorganic semiconductorperovskitephotoFETselective photodetection

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Photodetectors are crucial optoelectronic devices with diverse applications.
  • Enhanced sensitivity and selective wavelength detection are needed for advanced functionalities.
  • Current photodetector technology often relies on filters, leading to power losses.

Purpose of the Study:

  • To develop a novel photodetector capable of multiwavelength visible light detection.
  • To investigate the use of organic semiconductors and inorganic perovskites in a photodetector.
  • To demonstrate selective light detection and intensity sensitivity in a single device.

Main Methods:

  • Fabrication of a photofield-effect transistor (photoFET) using a blend of organic semiconductors and CsPbBr3 perovskite nanocrystals.
  • Utilizing the photogating effect in CsPbBr3 nanocrystals for light detection.
  • Characterizing device response to different wavelengths and intensities of visible light.

Main Results:

  • The novel photoFET demonstrated selective detection of blue light (below 520 nm) via threshold voltage shift.
  • Illumination over 600 nm resulted in increased current without threshold voltage shift, enabling red light detection.
  • The device showed sensitivity to light intensity across the visible spectrum and could discriminate between red and blue light.

Conclusions:

  • The developed photodetector successfully achieves multiwavelength visible light detection using a hybrid organic-inorganic material.
  • This innovative device offers enhanced photosensitivity by eliminating the need for external filters.
  • The integration of transistor and detection functions paves the way for reconfigurable and neuromorphic circuits.