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Issue 25, 2014
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Germanium nanoparticles with non-diamond core structures for solar energy conversion

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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.

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

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Publication details

The article was received on 31 Mar 2014, accepted on 22 Apr 2014 and first published on 01 May 2014


Article type: Paper
DOI: 10.1039/C4TA01543F
Citation: J. Mater. Chem. A, 2014,2, 9820-9827
  • Open access: Creative Commons BY license
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    Germanium nanoparticles with non-diamond core structures for solar energy conversion

    M. Vörös, S. Wippermann, B. Somogyi, A. Gali, D. Rocca, G. Galli and G. T. Zimanyi, J. Mater. Chem. A, 2014, 2, 9820
    DOI: 10.1039/C4TA01543F

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