Light emission from strained germanium

Jain, Jinendra Raja; Hryciw, Aaron C.; Baer, Thomas M.; Miller, David A. B.; Brongersma, Mark L.; Howe, Roger T.

doi:10.1038/nphoton.2013.50

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…The same near-zero oscillator strengths are observed, and thus the optical transparency does indeed lie with the Ge atoms. The optical excitation and emission of neutral Ge wires in the bulk have received much interest but so far have only been achieved with mechanical distortion. − Moreover, the only known absorption of Ge materials lies with GeH/F alloys in the infrared region, which has the potential for advanced CMOS optoelectronic systems . In corroboration, we have computed the vibrational frequencies for these molecules (SI, Table S56), and only three major absorption bands appear, around 65, 227, and 642 cm –1 , for 1 , although these can shift by more than 20 cm –1 to longer wavenumber with increasing molecular size.…”

Section: Resultsmentioning

confidence: 56%

Germanium Fluoride Nanocages as Optically Transparent n-Type Materials and Their Endohedral Metallofullerene Derivatives

Jones

Mosquera

et al. 2019

J. Am. Chem. Soc.

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Carbon- and silicon-based n-type materials tend to suffer from instability of the corresponding radical anions. With DFT calculations, we explore a promising route to overcome such challenges with molecular nanocages which utilize the heavier element Ge. The addition of fluorine substituents creates large electron affinities in the range 2.5–5.5 eV and HOMO–LUMO gaps between 1.6 and 3.2 eV. The LUMOs envelop the surfaces of these structures, suggesting extensive delocalization of injected electrons, analogous to fullerene acceptors. Moreover, these Ge n F n inorganic cages are found to be transparent in the UV–visible region as probed with their excited states. Their capacitance, linear polarizabilities, and dielectric constants are computed and found to be on the same order of magnitude as saturated oligomers and some extended π-organics (azobenzenes). Furthermore, we explore fullerene-type endohedral isomers, i.e., cages with internal substituents or guest atoms, and find them to be more stable than the parent exohedral isomers by up to −206.45 kcal mol–1. We also consider the addition of Li, He, Cs, and Bi, to probe the utility of the exo/endo cages as host–guest systems. The endohedral He/Li@F8@Ge60F52 cages are significantly more stable than their parent exohedral isomers He/Li@Ge60F52 by −182.46 and −49.22 kcal mol–1, respectively. The energy of formation of endohedral He@F8@Ge60F52 is exothermic by −10.4 kcal mol–1, while Cs and Bi guests are too large to be accommodated but are stable in the exohedral parent cages. Conceivable applications of these materials include n-type semiconductors and transparent electrodes, with potential for novel energy storage modalities.

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Section: Resultsmentioning

confidence: 56%

Germanium Fluoride Nanocages as Optically Transparent n-Type Materials and Their Endohedral Metallofullerene Derivatives

Jones

Mosquera

et al. 2019

J. Am. Chem. Soc.

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Room temperature direct-bandgap electroluminescence from a horizontal Ge ridge waveguide on Si

He¹,

Li²,

Cheng³

2016

Chinese Phys. B

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We report a lateral Ge-on-Si ridge waveguide light emitting diode (LED) grown by ultrahigh vacuum chemical vapor deposition (UHV-CVD). Direct-bandgap electroluminescence (EL) of Ge waveguide under continuous current is observed at room temperature. The heat-enhancing luminescence and thermal radiation-induced superlinear increase of edge output optical power are found. The spontaneous emission and thermal radiation based on the generalized Planck radiation law are calculated and fit very well to the experimental results. The Ge waveguides with different lengths are studied and the shorter one shows stronger EL intensity.

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Monolithically integrated Ge CMOS laser

Camacho-Aguilera

2014

SPIE Proceedings

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Light emission from strained germanium

Cited by 3 publications

References 5 publications

Germanium Fluoride Nanocages as Optically Transparent n-Type Materials and Their Endohedral Metallofullerene Derivatives

Germanium Fluoride Nanocages as Optically Transparent n-Type Materials and Their Endohedral Metallofullerene Derivatives

Room temperature direct-bandgap electroluminescence from a horizontal Ge ridge waveguide on Si

Monolithically integrated Ge CMOS laser

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