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Ultraviolet-C Photoresponsivity Using Fabricated TiO2 Thin Films and Transimpedance-Amplifier-Based Test Setup.

Marilou Cadatal-Raduban1,2, Jade Pope1, Jiří Olejníček3

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|November 11, 2022
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Fabricated titanium dioxide (TiO2) thin films function as effective ultraviolet-C (UV-C) photoconductivity sensors. Film thickness impacts performance, with thinner films showing higher photoresponsivity due to fewer defects.

Keywords:
UV-Cphotoconductive detectorsensorthin filmtitanium dioxidetransimpedance amplifierultraviolet

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Semiconductor Devices

Background:

  • Titanium dioxide (TiO2) is a semiconductor material with potential applications in optoelectronic devices.
  • Photoconductivity detectors are crucial for sensing light across various spectral regions.
  • Developing efficient UV-C detection is important for applications like sterilization and environmental monitoring.

Purpose of the Study:

  • To fabricate and characterize titanium dioxide (TiO2) thin films for use as UV-C photoconductivity sensors.
  • To investigate the effect of TiO2 film thickness on sensor performance at 260 nm.
  • To explore the potential of TiO2 thin films for chip-based UV-C detection.

Main Methods:

  • Fabrication of TiO2 thin films with varying thicknesses (100, 500, 1000 nm) on silicon substrates.
  • Utilized a transimpedance amplifier (TIA) test setup to measure photoconductivity.
  • Characterized sensor performance including photoresponsivity under UV-C irradiation (260 nm) at 30 V bias.

Main Results:

  • TiO2 thin films exhibited photoresponsivity, with values of 81.6, 55.6, and 19.6 mA/W for 100, 500, and 1000 nm thicknesses, respectively.
  • Thicker films showed improved crystallinity but decreased photocurrent, photoconductivity, photoconductance, and photoresponsivity, attributed to increased defects.
  • Film thickness was demonstrated as a controllable parameter for tuning the detector's wavelength response.

Conclusions:

  • TiO2 thin films are viable materials for UV-C photoconductivity detection.
  • Optimizing film thickness is critical for maximizing sensor performance and minimizing defect-related losses.
  • Further development could lead to chip-based, portable UV-C detectors with diverse applications.