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Updated: May 31, 2025

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Fabrication and Electrical Characterization of Low-Temperature Polysilicon Films for Sensor Applications.

Filipa C Mota1,2, Inês S Garcia1, Aritz Retolaza1

  • 1International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal.

Micromachines
|January 25, 2025
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Summary

Researchers developed a novel low-temperature polycrystalline silicon film using metal-induced crystallization. This material is suitable for flexible electronics and MEMS devices, showing potential for various sensor applications.

Keywords:
gauge factorlow-temperaturemetal-induced crystallizationpolyimidepolysilicontemperature coefficient of resistance

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Microelectromechanical Systems (MEMS)

Background:

  • Low-temperature fabrication is crucial for integrating advanced materials into standard silicon processes and flexible substrates.
  • Polycrystalline silicon (poly-Si) is a key material for microelectronics and MEMS, but traditional fabrication requires high temperatures.
  • Developing low-temperature methods expands the application scope of poly-Si, particularly for flexible and wearable devices.

Purpose of the Study:

  • To demonstrate the first fabrication of a 200 nm polycrystalline silicon thin film at low temperatures (450 °C) using metal-induced crystallization.
  • To investigate the structural, mechanical, and electrical properties of the low-temperature poly-Si on both silicon and flexible polyimide (PI) substrates.
  • To evaluate the potential of this novel material for sensor applications, including pressure, force, temperature, and photo-sensing.

Main Methods:

  • Metal-induced crystallization (MIC) using an AlSiCu alloy at 450 °C to form a 200 nm poly-Si film.
  • Fabrication on silicon and polyimide (PI) substrates.
  • Characterization of crystallite size (approx. 58 nm) and poly-Si grain size (1-3 µm on Si, 3-7 µm on PI).
  • Experimental evaluation of mechanical and electrical properties using microfabricated piezoresistive test structures and a four-point bending setup.

Main Results:

  • Successfully fabricated a 200 nm poly-Si thin film at 450 °C via MIC.
  • Achieved a longitudinal gauge factor (GF) of 12.31 and a transversal GF of -4.90.
  • Measured a linear temperature coefficient of resistance (TCR) of -2471 ppm/°C.
  • Observed sensitivity to light, indicating photo-sensing capabilities.

Conclusions:

  • The developed low-temperature poly-Si film is compatible with standard MEMS fabrication and suitable for flexible substrates.
  • The material exhibits promising piezoresistive properties (GF) and a significant TCR, suitable for pressure, force, and temperature sensors.
  • The film's photo-sensitivity opens avenues for its use in optoelectronic and photo-sensing applications.