Abstract: Tellurium is an elemental semiconductor, interest in which has recently increased due to the possibility of creating devices using structures based on thread-like crystals or whiskers (gas sensors, field-effect transistors, thermoelectric and piezoelectric devices, etc.) [1, 2]. Methods proposed for the growth of tellurium whiskers may be divided into two groups: (1) ‘wet’ chemical synthesis; (2) deposition from the gaseous phase. The thermal vacuum deposition technique is one of the most commonly used for producing thin films and thread-like crystals of tellurium. Its main disadvantage is that the vapor phase of tellurium is almost entirely composed of Te2 diatomic molecules, not Te atoms, leading to non-perfect surface structure (the mobility of Te2 atoms on the growing surface is low at substrate temperatures less than Тпл = 452 C). Thermochemical activation of the desired crystallization process of tellurium by introduction of H2 into the system is suggested, bringing H2Te molecule as a new precursor of growing crystals according to reaction Te + H2 = H2Te. This method allows to make tellurium crystals of different structural perfection and morphology: amorphous and epitaxial films, thread-like crystals (solid (Fig. 1b) and hollow-fiber (Fig 1a)), and microplates. Coupled thermodynamic and transport analysis for the «Te+H2+H2Te» system is performed to describe the peculiarities of this approach.

Cite: Kuzmin A.O. , Ismailov A.M. , Rabadanov M.R. , Shapiev I.M.
Coupled Thermodynamic and Transport Analysis for a «Te+H2» System Used for Synthesis of Thread-Like Crystals of Tellurium
In compilation Восьмая Международная конференция «Кристаллофизика и деформационное поведение перспективных материалов». 2019. – C.28. – ISBN 978-5-907226-33-3. DOI: 10.26201/ISSP.2019.45.557/Def.Mater.7

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