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Red shift for CdTe nanoparticle thin films and suspensions during heating.

S Dunn1, H C Gardner, C Bertoni

  • 1Nanotechnology Centre, Cranfield University, Cranfield, Bedfordshire, MK43 0AL, UK.

Journal of Nanoscience and Nanotechnology
|June 25, 2008
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Summary

Temperature significantly alters light emission from Cadmium Telluride (CdTe) nanoparticle clusters. Depositing CdTe nanoparticles into films or heating suspensions causes a permanent red-shift in photoluminescence, linked to morphological changes.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Cadmium Telluride (CdTe) nanoparticle clusters are utilized in various optoelectronic applications.
  • Understanding their photoluminescent properties under different conditions is crucial for device performance.

Purpose of the Study:

  • To investigate the effect of temperature on the photoluminescent (PL) emission wavelength of CdTe nanoparticle clusters.
  • To compare the thermal behavior of CdTe nanoparticles in suspension versus thin films.

Main Methods:

  • Preparation of CdTe nanoparticle clusters in suspension and thin films via layer-by-layer deposition.
  • Photoluminescence spectroscopy to measure emission wavelength and intensity.
  • Temperature cycling experiments (5°C to 85°C).
  • Scanning probe microscopy (SPM) for morphological analysis.

Main Results:

  • Thin films exhibited an initial 6-8 nm red-shift in PL compared to suspensions.
  • Initial heating of suspensions to 85°C caused a non-recoverable 6-8 nm red-shift.
  • Suspensions showed a slight red-shift tendency with repeated heating, while films did not.
  • Film emission intensity dropped by ~50% after one heating cycle; suspensions showed a transient ~3-5% increase before decay.
  • SPM analysis revealed morphological changes in films responsible for the permanent red-shift.

Conclusions:

  • Temperature influences the emission wavelength of CdTe nanoparticle clusters.
  • Morphological changes, rather than trap states, are the primary cause of the permanent red-shift in thin films upon heating.
  • CdTe nanoparticle behavior differs significantly between suspension and thin-film states under thermal stress.