Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods

Lazaro A. Padilha, John T. Stewart, Richard L. Sandberg, Wan Ki Bae, Weon Kyu Koh, Jeffrey M. Pietryga, Victor I Klimov

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Nanomaterials with efficient carrier multiplication (CM), that is, generation of multiple electron-hole pairs by single photons, have been the object of intense scientific interest as potential enablers of high efficiency generation-III photovoltaics. In this work, we explore nanocrystal shape control as a means for enhancing CM. Specifically, we investigate the influence of aspect ratio (ρ) of PbSe nanorods (NRs) on both CM and the inverse of this process, Auger recombination. We observe that Auger lifetimes in NRs increase with increasing particle volume and for a fixed cross-sectional size follow a linear dependence on the NR length. For a given band gap energy, the CM efficiency in NRs shows a significant dependence on aspect ratio and exhibits a maximum at ρ ∼ 6-7 for which the multiexciton yields are a factor of ca. 2 higher than those in quantum dots with a similar bandgap energy. To rationalize our experimental observations, we analyze the influence of dimensionality on both CM and non-CM energy-loss mechanisms and offer possible explanations for the seemingly divergent effects the transition from zero- to one-dimensional confinement has on the closely related processes of Auger recombination and CM.

Original languageEnglish
Pages (from-to)1092-1099
Number of pages8
JournalNano Letters
Volume13
Issue number3
DOIs
Publication statusPublished - Mar 13 2013

Fingerprint

Nanorods
multiplication
nanorods
aspect ratio
Aspect ratio
Energy gap
Nanostructured materials
Nanocrystals
Semiconductor quantum dots
Energy dissipation
Photons
shape control
lead selenide
Electrons
nanocrystals
energy dissipation
quantum dots
life (durability)
photons

Keywords

  • Auger recombination
  • carrier multiplication
  • multiexciton
  • Nanocrystal
  • nanorod
  • quantum dot

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Padilha, L. A., Stewart, J. T., Sandberg, R. L., Bae, W. K., Koh, W. K., Pietryga, J. M., & Klimov, V. I. (2013). Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods. Nano Letters, 13(3), 1092-1099. https://doi.org/10.1021/nl304426y

Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods. / Padilha, Lazaro A.; Stewart, John T.; Sandberg, Richard L.; Bae, Wan Ki; Koh, Weon Kyu; Pietryga, Jeffrey M.; Klimov, Victor I.

In: Nano Letters, Vol. 13, No. 3, 13.03.2013, p. 1092-1099.

Research output: Contribution to journalArticle

Padilha, LA, Stewart, JT, Sandberg, RL, Bae, WK, Koh, WK, Pietryga, JM & Klimov, VI 2013, 'Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods', Nano Letters, vol. 13, no. 3, pp. 1092-1099. https://doi.org/10.1021/nl304426y
Padilha LA, Stewart JT, Sandberg RL, Bae WK, Koh WK, Pietryga JM et al. Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods. Nano Letters. 2013 Mar 13;13(3):1092-1099. https://doi.org/10.1021/nl304426y
Padilha, Lazaro A. ; Stewart, John T. ; Sandberg, Richard L. ; Bae, Wan Ki ; Koh, Weon Kyu ; Pietryga, Jeffrey M. ; Klimov, Victor I. / Aspect ratio dependence of auger recombination and carrier multiplication in PbSe nanorods. In: Nano Letters. 2013 ; Vol. 13, No. 3. pp. 1092-1099.
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