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• W3135383543 abstract "The lack of useful and cost-efficient group-IV direct band gap light emitters still presents the main bottleneck for complementary metal-oxide semiconductor-compatible short-distance data transmission, single-photon emission, and sensing based on silicon photonics. Germanium, a group-IV element like Si, is already widely used in silicon fabs. While the energy band gap of Ge is intrinsically indirect, we predict that the insertion of Ge-Ge split-[110] interstitials into crystalline Ge can open up a direct band gap transmission path. Here, we calculate from first principles the band structure and optical emission properties of Ge, Sb, and Sn split-[110] interstitials in bulk and low-dimensional Ge at different doping concentrations. Two types of electronic states provide the light-emission enhancement below the direct band gap of Ge: a hybridized L-$mathrm{ensuremath{Gamma}}$ state at the Brillouin zone center and a conduction band of $mathrm{ensuremath{Delta}}$ band character that couples to a raised valence band along the $mathrm{ensuremath{Gamma}}$-X direction. Majority carrier introduced to the system through doping can enhance light emission by saturation of nonradiative paths. Ge-Sn split interstitials in Ge shift the top of the valence band towards the $mathrm{ensuremath{Gamma}}$-X direction and increase the $mathrm{ensuremath{Gamma}}$ character of the L-$mathrm{ensuremath{Gamma}}$ state, which results in a shift to longer emission wavelengths. Key spectral regions for datacom and sensing applications can be covered by applying quantum confinement in defect-enhanced Ge quantum dots for an emission wavelength shift from the midinfrared to the telecom regime." @default.
• W3135383543 created "2021-03-15" @default.
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• W3135383543 date "2021-02-25" @default.
• W3135383543 modified "2023-10-17" @default.
• W3135383543 title "Light emission from direct band gap germanium containing split-interstitial defects" @default.
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• W3135383543 doi "https://doi.org/10.1103/physrevb.103.085310" @default.
• W3135383543 hasPublicationYear "2021" @default.
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