Two-valence band electron and heat transport in monocrystalline PbTe-CdTe solid solutions with high Cd content
| Autor: | Szot, M., Pfeffer, P., Dybko, K., Szczerbakow, A., Kowalczyk, L., Dziawa, P., Minikayev, R., Zayarnyuk, T., Piotrowski, K., Gutowska, M. U., Szewczyk, A., Story, T., Zawadzki, W. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 4, 044605 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.4.044605 |
| Popis: | High quality p-type PbTe-CdTe monocrystalline alloys containing up to 10 at.$\%$ of Cd are obtained by self-selecting vapor transport method. Mid infrared photoluminescence experiments are performed to follow the variation of the fundamental energy gap as a function of Cd content. The Hall mobility, thermoelectric power, thermal conductivity and thermoelectric figure of merit parameter $ZT$ are investigated experimentally and theoretically paying particular attention to the two-valence band structure of the material. It is shown that the heavy-hole band near the $\Sigma$ point of the Brillouin zone plays an important role and is responsible for the Pb$_{1-x}$Cd$_x$Te hole transport at higher Cd-content. Our data and their description can serve as the standard for Pb$_{1-x}$Cd$_x$Te single crystals with $x$ up to 0.1. It is shown, that monocrystalline Pb$_{1-x}$Cd$_x$Te samples with relatively low Cd content of about 1 at.\% and hole concentration of the order of 10$^{20}$ cm$^{-3}$ may exhibit $ZT \approx$ 1.4 at 600 K. Comment: 11 pages, 12 figures |
| Databáze: | arXiv |
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