Evidence for Barrierless Auger Recombination in PbSe Nanocrystals: A Pressure-Dependent Study of Transient Optical Absorption

Jeffrey M. Pietryga, Kirill K. Zhuravlev, Michael Whitehead, Victor I. Klimov, and Richard D. Schaller
Phys. Rev. Lett. 101, 217401 – Published 18 November 2008

Abstract

We report rates of Auger recombination (AR) in zero-dimensional (0D) PbSe nanocrystals as a function of energy gap (Eg) by using applied hydrostatic pressure to controllably shift Eg according to the bulk deformation potential. Our studies reveal that the rate of AR in nanocrystals is insensitive to energy gap, which is in contrast with bulk semiconductors where this rate shows exponential dependence on Eg. These measurements represent the first direct experimental evidence that AR in 0D nanomaterials is barrierless, in distinction from bulk semiconductors.

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  • Received 30 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.217401

©2008 American Physical Society

Authors & Affiliations

Jeffrey M. Pietryga, Kirill K. Zhuravlev, Michael Whitehead, Victor I. Klimov*, and Richard D. Schaller

  • Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *klimov@lanl.gov
  • rdsx@lanl.gov

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Issue

Vol. 101, Iss. 21 — 21 November 2008

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