npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2018; 68: 731-736

Published online July 31, 2018 https://doi.org/10.3938/NPSM.68.731

Copyright © New Physics: Sae Mulli.

Thermoelectric Properties of Electroplated BiTe Thin Films

Jinsung NOH1,2, Hoyoung SUH1,3, Jihyun KIM1, Jeongsub LEE1, Kimin HONG*1

1 Department of Physics, Chungnam National University, Daejeon 34134, Korea

2 Tegway, 711 National Nano Fab, Daejeon 34141, Korea
3 Electron Microscopy Research Center, Korea Basic Science Institute, Daejeon 34133, Korea

Correspondence to:kmhong@cnu.ac.kr

Received: May 18, 2018; Revised: June 11, 2018; Accepted: June 19, 2018

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We fabricated BiTe thin films by using electroplating methods. The compositions of the thin films were controlled by applying different process conditions, such as the electrolyte's composition and the plating potential. We investigated variations in the cystal orientations and the grain sizes due to changes in the process parameters. We also measured the power factor of the films, which is one of the most important parameters for thermoelectric elements. We induced changes in the grain size and the crystal orientation by using high-temperature annealing. Generally, the grain sizes increased proportionally with increasing annealing time. A thin film that was mostly composed of BiTe(110) exhibited the largest power factor when the temperature difference was 10 $^\circ$C.

Keywords: Thermoelectric effect, Thin film, Electroplating, Electronic transport, Thermal conduction ,

전기도금 방법으로 BiTe 박막을 제작하였는데, 전해액의 조성과 도금 전압을 변화시킴으로써 BiTe의 성분비를 조절하였다. 도금 공정의 변화에 따른 BiTe 박막의 결정성, 입도 및 전기전도 특성을 조사하고 열전특성의 하나인 전력 상수를 측정하였다. 도금 박막에 대한 열처리를 통하여 박막의 입도와 결정성의 변화를 유도하였는데, 일반적으로 열처리 시간의 증가에 따라 입도는 증가하는 경향을 보였다. 다양한 BiTe 박막 중 주로 (110)의 결정성을 지닌 박막에 대하여 전력 상수를 측정한 결과 시료 양단간의 온도차가 10 $^\circ$C일 때 가장 큰 전력 상수를 나타낸다.

Keywords: 열전효과, 박막, 전기도금, 전하수송, 열전도

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