Thermoelectric properties of electrodeposited CuNi alloys on Si

Autor:	Saulo Güths, André A. Pasa, R. G. Delatorre, M. L. Sartorelli, A.Q. Schervenski
Rok vydání:	2003
Předmět:	Thin layers Materials science Constantan Metallurgy Alloy General Physics and Astronomy chemistry.chemical_element Substrate (electronics) engineering.material Copper chemistry Seebeck coefficient Thermoelectric effect engineering Thin film Composite material
Zdroj:	Journal of Applied Physics. 93:6154-6158
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1569432
Popis:	Thin films with the composition of the constantan alloy (a solid solution with 35 to 50 wt. % of Ni in Cu) have a high-thermoelectric power, which allows the fabrication of very sensitive heat-flux sensors based on planar technology. In this article, the thermoelectric properties of CuxNi100−x thin films electrodeposited on silicon were studied as a function of the composition, temperature, and thickness. The electrodeposition of thin layers on silicon is an important step for the integration of thermal sensors with semiconductor technology. The CuxNi100−x alloys were electrodeposited potentiostatically at room temperature, from a citrate electrolyte containing both copper and nickel sulfates. The layer composition was controlled by the applied potential in the range from pure copper (at −0.4 V/SCE) up to a solid solution of about 25 wt. % Cu in Ni (at −1.2 V/SCE). Extremely high values of thermoelectric power were measured for very thin layers of Cu40Ni60 on Si, showing a strong influence of the substrate. By considering the system as a thermoelectric bilayer and extracting the contribution of the semiconductor, thermopower values for the Cu40Ni60 alloys comparable to the expected ones for constantan wires were obtained.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b58649b10c87a2ea8f80b09bb52bc774 https://doi.org/10.1063/1.1569432 Zobrazit plný text záznamu