Temperature dependence of the band structure of ZnS, ZnSe, ZnTe, and CdTe wurtzite-type semiconductor compounds

Gorkavenko, T. V.; Zubkova, S. M.; Макара, В. А.; Rusina, L. N.

doi:10.1134/s1063782607080040

Cited by 12 publications

(20 citation statements)

References 10 publications

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“…ZnS and ZnSe are characterized by large band gaps (respectively 3.5 and 2.8 eV [91] ), therefore their absorption contribution in the visible spectrum is usually negligible, and their luminescence is generally in the blue-green region of the vis spectrum, where few PV cells are exhibiting top spectral responsivity. ZnS and ZnSe are characterized by large band gaps (respectively 3.5 and 2.8 eV [91] ), therefore their absorption contribution in the visible spectrum is usually negligible, and their luminescence is generally in the blue-green region of the vis spectrum, where few PV cells are exhibiting top spectral responsivity.…”

Section: Ternary Alloys and Environmentally Friendly Chalcogenidesmentioning

confidence: 99%

The Renaissance of Luminescent Solar Concentrators: The Role of Inorganic Nanomaterials

Mazzaro

Vomiero

2018

Advanced Energy Materials

130

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While luminescent solar concentrators (LSCs) have a simple architecture—a transparent matrix embedding a luminescent fluorophore coupled with solar cells at the lateral side of the LSC slab—multiple paths for possible light losses exist. These are inherently interconnected, and in the past, limited the interest in this device, due to the gap between the theoretical possibilities and experimental achievements. This gap was a result, primarily, of the optical features of the luminescent dyes, since conventional organic luminophores are affected by limited performance in LSC devices. The rise of a wide portfolio of optically active inorganic nanomaterials in the last decade provides an alternative to organic dyes and has lead to a renaissance in the role of LSCs among the unconventional solar energy conversion devices. This paper reviews the latest results in the development of LSCs based on different classes of nanomaterials, focusing on the specific features and critically analyzing the pros and cons of the proposed structures. Particular attention is devoted to the role of the luminescence properties, e.g., the Stokes shift and the photoluminescence quantum yield, with respect to the performance of the LSC device. Future challenges to the successful employment of these devices for building integrated photovoltaics are also discussed.

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Section: Ternary Alloys and Environmentally Friendly Chalcogenidesmentioning

confidence: 99%

The Renaissance of Luminescent Solar Concentrators: The Role of Inorganic Nanomaterials

Mazzaro

Vomiero

2018

Advanced Energy Materials

130

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“…The correct approach [15] at high temperatures is to first perform electronic structure calculations using the ES(DWF) formalism and use the results obtained to calculate the self-energy corrections. This formalism is the first recourse to account for the changes in valence electron properties in semiconductors and metals [29][30][31][32][33][34][35]. Frequently in practice, only the DWF is incorporated through the ES(DWF) formalism and the results are compared with experiments [29][30][31][32][33][34][35].…”

Section: Literature Because Analysis Of Diffraction Data Always Incomentioning

confidence: 99%

“…The core energy terms have been obtained from diffraction theory [20] according to which the core potentials are given by Eq.7 and Eq.13. But Eq.7 and Eq.13 are also the core potentials used in the ES(DWF) formalism [15,[29][30][31][32][33][34][35]. Thus, diffraction theory is completely compatible with ES(DWF) formalism.…”

Section: Literature Because Analysis Of Diffraction Data Always Incomentioning

confidence: 99%

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Role of thermal vibrations in alloy phase transitions

Prasanna

2011

Phase Transitions

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All theoretical models (Heisenberg, Ising etc.) assume a negligible role for thermal vibrations in alloy and magnetic phase transitions. Analysis of diffraction data conclusively proves that this assumption is incorrect. A simple criterion emerges that theoretical models can ignore the role of thermal vibrations only if the Debye-Waller Factor is ignored in the analysis of diffraction data. Diffraction data constrain all theoretical models to incorporate the role of thermal vibrations. This conclusion is also supported by other experimental results, the effect of thermal vibrations on ordering energy that is of the same order of magnitude as ordering energy and an isotope effect on magnetic phase transitions. An electron-phonon interaction (EPI) formalism that incorporates the Debye-Waller Factor in electronic structure calculations already exists and must be adopted for a correct understanding of phase transitions as it can account for all the different experimental results mentioned above. The discrepancy between experimental and theoretical ordering energy in Ni 3 V is direct evidence for the role of thermal vibrations in altering ordering energy. The inter-nuclear potential energy term converges if zero point vibrations are incorporated and this method can replace the Ewald sum method. The three dimensional Ising model cannot represent order-disorder transition in beta brass, CuZn. An isotope effect is predicted for magnetic phase transitions if the transition temperature is below Debye temperature. The long range order parameter obtained from diffraction data can only be compared with predictions of models that incorporate the role of thermal vibrations and not otherwise.

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“…На відповідних диферен-ціальних кривих R' ω спостерігається головна особливість при ħω = 2,89 еВ. Отримане зна-чення добре узгоджується з літературними да-ними, за якими E g = 2,88 еВ [8]. Особливості при 2,96 еВ та 3,26 еВ визначаються оптич-ними переходами за участю підзон валентної зони, відщеплених під дією кристалічного поля ∆ CR і спін-орбітальної взаємодії ∆ SO .…”

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