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Updated: Apr 5, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
Effects of Lattice Strain and Band Offset on Electron Transfer Rates in Type-II Nanorod Heterostructures
Hunter McDaniel1, Matthew Pelton2, Nuri Oh1
1†Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States.
Abstract:
Type-II nanorod heterostructures (NRHs) exhibit efficient directional charge separation and provide the potential to control this flow of charges through changes in structure and composition. We use transient-absorption spectroscopy to investigate how the magnitude of band offset and lattice strain alters dynamics of photogenerated electrons in CdSe/CdTe type-II NRHs. In the absence of alloying and strain effects, electron transfer occurs in ∼300 fs. Reducing the conduction band offset by means of alloying leads to an even shorter charge-separation time (<200 fs), whereas curved NRHs with pronounced strain exhibit a longer charge-separation time of ∼700 fs.
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