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Issue 65, 2014
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Polygermanes: bandgap engineering via tensile strain and side-chain substitution

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Successful synthesis of the phenylisopropyl hexagermane (Chem. Commun. 2013, 49, 8380) offers an exciting opportunity to synthesize a new class of low-dimensional germanium compounds with novel optical and electronic properties. Using the phenylisopropyl hexagermane as a model template, we have performed an ab initio study of electronic properties of polygermanes. Our density functional theory calculations show that the polygermane is a quasi-one-dimensional semiconductor with a direct bandgap, and its valence and conduction bands are mainly contributed by the skeletal Ge atoms. We have also explored effects of tensile and compressive strains and various side-chain substituents on the bandgap. The bandgap of polygermanes can be reduced upon attaching larger-sized substituents to the side chains. More importantly, applying a tensile/compressive strain can modify the bandgap of polygermanes over a wide range. For poly(diphenlygermane), the tensile strain can result in significant bandgap reduction due to the increasingly delocalized charge density in the conduction band. Moreover, a strong compressive strain can induce a direct-to-indirect semiconductor transition owing to the change made in the band-edge states. A similar strain effect is seen in polystannanes as well.

Graphical abstract: Polygermanes: bandgap engineering via tensile strain and side-chain substitution

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The article was received on 21 May 2014, accepted on 22 Jun 2014 and first published on 23 Jun 2014

Article type: Communication
DOI: 10.1039/C4CC03907F
Citation: Chem. Commun., 2014,50, 9126-9129
  • Open access: Creative Commons BY-NC license
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    Polygermanes: bandgap engineering via tensile strain and side-chain substitution

    W. Fa and X. C. Zeng, Chem. Commun., 2014, 50, 9126
    DOI: 10.1039/C4CC03907F

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