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Heteroconfinement in Single CdTe Nanoplatelets.

Tasnim Ahmed1, Xuanheng Tan1, Barry Y Li1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive, Los Angeles, California 90095-1569, United States.

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Summary
This summary is machine-generated.

Synthesizing thicker cadmium telluride (CdTe) nanoplatelets (NPLs) is difficult due to their unique growth. We found that higher layer CdTe NPLs form as mixed-layer structures, limiting their synthesis.

Keywords:
heteroconfinementkinetic Monte Carlo simulationsnanoplateletssingle-particle spectroscopytrap-emission

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dots

Background:

  • Atomically thin II-VI nanoplatelets (NPLs) are crucial for optoelectronic applications.
  • Synthesizing dimension-engineered cadmium selenide (CdSe) NPLs with controlled thickness (2-11 monolayers) is established.
  • Cadmium telluride (CdTe) NPLs present significant synthesis and separation challenges, hindering advanced applications.

Purpose of the Study:

  • To elucidate the mechanistic insights into the layer-by-layer growth kinetics of CdTe NPLs.
  • To understand the challenges in synthesizing higher monolayer (ML) CdTe NPLs beyond 2 ML.
  • To explain the observed differences in growth kinetics between CdTe and CdSe NPLs.

Main Methods:

  • Ensemble and single-particle spectroscopy and microscopy.
  • Transient absorption spectroscopy.
  • Atomic force microscopy (AFM) and simulations of growth conditions.

Main Results:

  • Higher ML CdTe NPLs (>2 ML) initially form as heteroconfined structures with colocalized multilayer emissions (e.g., 3 and 4 ML).
  • Single NPLs exhibit islands of different MLs, confirmed by AFM and optical analyses.
  • Simulations revealed that lower monomer binding energy in CdTe, compared to CdSe, dictates growth kinetics and limits higher ML synthesis.

Conclusions:

  • The nonstandard nucleation and growth of heteroconfined CdTe NPLs are driven by kinetic factors related to monomer binding energy.
  • Lower CdTe bond energy compared to CdSe limits the synthesis of higher ML CdTe NPLs.
  • These findings provide crucial understanding for advancing the synthesis of dimension-engineered CdTe nanomaterials.