Thermoelectric PbTe-CdTe bulk nanocomposite
| Autor: | Szot, M., Dybko, K., Mycielski, A., Reszka, A., Minikayev, R., Dziawa, P., Story, T. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The preparation method of thermoelectric PbTe-CdTe semiconductor nanocomposite in the form of a bulk material doped with Bi, I or Na, intended for production the mid-temperature thermoelectric energy generators is presented. The method takes advantage of the extremely low mutual solubility of both semiconductors, resulting from their different crystal structure, and is based on a specifically designed Bridgman growth procedure. It is shown that the formation of zinc-blende crystalline CdTe grains in the rock-salt matrix of thermoelectric PbTe can be forced during the synthesis of a composite by introducing Cd in the form of CdTe compound and choosing the growth temperature above the melting point of PbTe but below the melting point of CdTe. X-ray diffraction and SEM-EDX spectroscopy analyzes as well as basic electric and thermoelectric characterization of the nanocomposite samples containing 2, 5 and 10 at. \% of Cd showed that using proposed growth procedure, it is possible to obtain both n-type (Bi- or I-doped) and p-type (Na-doped) material with carrier concentration of 1{\div}5 x 10\^{19} cm\^{-3} and uniformly distributed CdTe grains with a diameter of the order of 100 nm. Comment: 18 pages, 7 figures |
| Databáze: | arXiv |
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