Bi-Te系熱電化合物の熱起電力に及ぼす電極の効果

概要

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The measurements of apparent effective Seebeck coefficients S_a thermoelectric powers ΔE and I-V characteristics were made on the semiconductor which has two parallel belt-shaped thin films sputtered with several types of metal as electrodes, where the semiconductor is consisted of the p-and n-type bismuth telluride compounds. The thermoelectric power ΔE generated between two belt-shaped films by imposing the temperature difference of ΔT=10 K on a thermoelement decreased rapidly with an increase of electrical resistance r, which is the sum of intrinsic resistance r_i of a semiconductor and boundary electrical resistance r_c between a semiconductor and two thin films. ΔE was changed significantly with the type of metal electrode. The difference in ΔE was found to be due to the difference in both r_i and S_a. When two electrodes of a thermoelement are composed of Cu and Pt films, ΔE was found to achieve enhancements of up to 8% or even more when compared to the ordinary thermoelement with Cu and Cu films. Thus, the selection of the optimal metal electrode was found to be necessary to make the thermoelectric conversion efficiency as high as possible, even when the electrode is formed by sputtering method.
愛媛大学の論文