Paper Title:

Thermoelectric Properties of Bi2Te3/Sb2Te3 Thin Films

Periodical Materials Science Forum (Volumes 514 - 516)
Main Theme Advanced Materials Forum III
Edited by Paula Maria Vilarinho
Pages 156-160
DOI 10.4028/www.scientific.net/MSF.514-516.156
Citation Luís M. Gonçalves et al., 2006, Materials Science Forum, 514-516, 156
Online since May, 2006
Authors Luís M. Gonçalves, Carlos Couto, Pedro Alpuim, D. Michael Rowe, J. Higino Correia
Keywords Micro-Cooler, Peltier, Thermoelectric, Thin Film
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The deposition and characterization of n-type Bi2Te3 and p-type Sb2Te3 semiconductor films are reported. The films were deposited by thermal co-evaporation on a 25 µm thick polyimide (kapton) substrate. The co-evaporation method is inexpensive, simple, and reliable, when compared to other techniques that need longer time periods to prepare the starting material or require more complicated and expensive deposition equipment. Seebeck coefficients of -189 µVK-1 and +140 µVK-1 and electrical resistivities of 7.7 µ0m and 15.1 µ0m were measured at room temperature on n-type and p-type films, respectively. These values are better than those reported for films deposited by co-sputtering or electrochemical deposition, and are close to those reported for films deposited by metal-organic chemical vapour deposition or flash evaporation. Because of their high figures of merit, these films will be used for the fabrication of a micro-Peltier element, useful in temperature control and laser-cooling for telecommunications.

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