Free-exciton absorption measurements in the temperature range 2-20K and corresponding luminescence measurements between 5 and 12K on high-purity germanium are described. Accurate threshold energies have been determined to yield values for the exciton energy gap, the LA and LO momentum-conserving phonon...
The pressure dependence of the energy gap corresponding to allowed optical transitions in germanium has been measured at room temperature and pressures up to 7000 kg/cm 2. This direct energy gap is found to increase at a rate of 1.3 ± 0.1 × 10 5 eV cm 2/ kg, in agreement with ...
The data shows that if silicon elements are replaced by germanium, the H-grabbing energy will be ameliorated. Electromagnetic and thermodynamic properties of SiO, GeO, and SiO-GeO nanoclusters have [...] Open Access Original Research Security Length Associated with the Risk of Ammonia Tank Leak...
It was deduced from surface recombination measurements that in the case of silicon, contrary to germanium, surface states (recombination centres) are always present. The energy level of these states within the forbidden gap depends on the type of electrolyte used for these investigations. The ...
ATR-FTIR relies on the interaction between an internal reflection element (IRE) comprising an infrared transparent material with a high refractive index—ATR crystals such as germanium, zinc selenide, zinc sulfide, or diamond—and a sample placed on the surface of the IRE [90]. The incident ...
For the Γ1 and Γ2 non-degenerate electronic CF states magnetic HFS is forbidden in the first approximation. Electric quadrupole and pseudoquadrupole (magnetic dipole in the second approximation) hyperfine interactions split Γ1 and Γ2 singlets into four nonequidistant hyperfine sublevels and lead...
A key signature of vibrational anharmonicity in HaPs at higher temperatures is the Raman central peak26,33,34,35,43,44,45. We use this feature that is nominally symmetry-forbidden in the cubic phase as a fingerprint to directly investigate how the propensity for cation lone-pair formation or ...
Park et al. reported that MA+loss would become serious when aged temperature over 80 °C, leading to severe cell degradation [30]. Therefore, narrowing the band gap to the ideal band gap of ~ 1.34 eV (based on the SQ limit) for the perovskite is very essential to achieve the maxi...
where ‘\(\alpha_{{\text{o }}}\)’ is a constant, and ‘Eu’ is the Urbach energy, which supports the formation of depth-of-tail levels elongating into the forbidden electronic bandgap below the absorption edge. The Urbach energy plot illustrated as the function of high photon energy (...
The field (geometrical) theory of specific heat is based on the universal thermal sum, a new mathematical tool derived from the evolution equation in the Euclidean four-dimensional spacetime, with the closed time coordinate. This theory made it possible