Related Experiment Video
Updated: May 27, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
Single-particle studies of band alignment effects on electron transfer dynamics from semiconductor
Chi-Tsu Yuan1, Yong-Gang Wang, Kuo-Yen Huang
1Research Center for Applied Sciences, Academia Sinica, 128 Academia Road, Taipei 115-29, Taiwan.
Abstract:
We utilize single-molecule spectroscopy combined with time-correlated single-photon counting to probe the electron transfer (ET) rates from various types of semiconductor hetero-nanocrystals, having either type-I or type-II band alignment, to single-walled carbon nanotubes. A significantly larger ET rate was observed for type-II ZnSe/CdS dot-in-rod nanostructures as compared to type-I spherical CdSe/ZnS core/shell quantum dots and to CdSe/CdS dot-in-rod structures. Furthermore, such rapid ET dynamics can compete with both Auger and radiative recombination processes, with significance for effective photovoltaic operation.

