Germanium nanoparticles with non-diamond core structures for solar energy conversion

Márton Vörös, Stefan Wippermann, Bálint Somogyi, A. Gali, Dario Rocca, Giulia Galli, Gergely T. Zimanyi

Research output: Article

18 Citations (Scopus)

Abstract

Multiple Exciton Generation (MEG) in nanoparticle-based solar cells promises to increase the cell-efficiency above the Shockley-Queisser limit. However, utilizing MEG is hampered by the Quantum Confinement Dilemma (QCD): quantum confinement advantageously increases the effective Coulomb interaction, but at the same time disadvantageously increases the electronic gap. Using ab initio calculations we showed that germanium nanoparticles with core structures of high pressure phases of bulk Ge can transcend the QCD, by simultaneously lowering gaps and increasing the MEG rates above those of NPs with a cubic diamond core. Synthesis routes to obtain Ge colloidal ST12 core structures are available and hence we propose that exploring ST12 Ge NPs for MEG solar cells is a promising research effort. This journal is

Original languageEnglish
Pages (from-to)9820-9827
Number of pages8
JournalJournal of Materials Chemistry A
Volume2
Issue number25
DOIs
Publication statusPublished - júl. 7 2014

Fingerprint

Germanium
Energy conversion
Excitons
Solar energy
Quantum confinement
Nanoparticles
Solar cells
Diamond
Coulomb interactions
Diamonds
LDS 751

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Vörös, M., Wippermann, S., Somogyi, B., Gali, A., Rocca, D., Galli, G., & Zimanyi, G. T. (2014). Germanium nanoparticles with non-diamond core structures for solar energy conversion. Journal of Materials Chemistry A, 2(25), 9820-9827. https://doi.org/10.1039/c4ta01543f

Germanium nanoparticles with non-diamond core structures for solar energy conversion. / Vörös, Márton; Wippermann, Stefan; Somogyi, Bálint; Gali, A.; Rocca, Dario; Galli, Giulia; Zimanyi, Gergely T.

In: Journal of Materials Chemistry A, Vol. 2, No. 25, 07.07.2014, p. 9820-9827.

Research output: Article

Vörös, M, Wippermann, S, Somogyi, B, Gali, A, Rocca, D, Galli, G & Zimanyi, GT 2014, 'Germanium nanoparticles with non-diamond core structures for solar energy conversion', Journal of Materials Chemistry A, vol. 2, no. 25, pp. 9820-9827. https://doi.org/10.1039/c4ta01543f
Vörös, Márton ; Wippermann, Stefan ; Somogyi, Bálint ; Gali, A. ; Rocca, Dario ; Galli, Giulia ; Zimanyi, Gergely T. / Germanium nanoparticles with non-diamond core structures for solar energy conversion. In: Journal of Materials Chemistry A. 2014 ; Vol. 2, No. 25. pp. 9820-9827.
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