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Related Experiment Videos

Electroluminescence from a single-nanocrystal transistor.

Mark S Gudiksen1, Kristin N Maher, Lian Ouyang

  • 1Department of Chemistry, Harvard University, Cambridge, Massachusetts 02138, USA.

Nano Letters
|November 10, 2005
PubMed
Summary

We fabricated light-emitting transistors using cadmium selenide (CdSe) nanocrystals. These devices exhibit single-electron tunneling and emit polarized light due to inelastic electron scattering.

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Area of Science:

  • Nanoscience and Nanotechnology
  • Solid-State Physics
  • Optoelectronics

Background:

  • Individual semiconductor nanocrystals offer unique quantum mechanical properties for electronic and optoelectronic applications.
  • Controlling electron transport at the single-electron level is crucial for developing advanced nanoscale devices.
  • Light emission from nanostructures can be tuned by their size, composition, and surrounding electrical environment.

Purpose of the Study:

  • To fabricate and characterize novel light-emitting transistors based on individual cadmium selenide (CdSe) nanocrystals.
  • To investigate the charge transport mechanisms, specifically single-electron tunneling, within the CdSe nanocrystals.
  • To explore the conditions and mechanisms leading to light emission and its polarization.

Main Methods:

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  • Fabrication of transistors with integrated individual CdSe nanocrystals and asymmetric tunnel barriers.
  • Low-temperature electrical measurements to observe Coulomb blockade and single-electron tunneling phenomena.
  • Optical characterization to analyze light emission properties, including polarization, as a function of electrical bias.

Main Results:

  • Clear observation of Coulomb blockade, confirming single-electron tunneling through the CdSe nanocrystal at low bias.
  • Generation of linearly polarized light when the bias voltage exceeds the CdSe band gap.
  • Correlation between bias-dependent tunnel coupling, electron scattering, and light emission characteristics.

Conclusions:

  • Demonstrated feasibility of light-emitting transistors utilizing individual CdSe nanocrystals.
  • Established single-electron tunneling as the primary charge transport mechanism.
  • Identified inelastic scattering of tunneling electrons as the source of bias-dependent, polarized light emission.