Electrodeposition of Bi2Te3 Films from Basic Ammoniacal Solutions and Their Thermoelectric Properties

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  • 塩基性アンモニア浴からのBi2Te3薄膜の電析と熱電特性
  • エンキセイ アンモニアヨク カラノ Bi2Te3 ハクマク ノ デンセキ ト ネツデン トクセイ

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Abstract

  Using the basic solution made of Bi(NO3)3•5H2O(4.0×10-3, 4.5×10-3, 5.0×10-3, 6.0×10-3, 7.0×10-3 kmol•m-3), TeO2: (3.0×10-3 kmol•m-3) and nitrilotriacetic acid (NTA: 0.1 kmol•m-3) at pH 9.5, electrochemical deposition of stoichiometric, crystalline Bi2Te3 film was carried out at various potential of -0.6, -0.7 and -0.8 V. The experimental results obtained are as follows;<br>    (1) Electrochemical experimental condition for crystalline Bi2Te3 film deposition is as follows: the basic solution containing Bi(NO3)3•5H2O(5.0×10-3 kmol•m-3), TeO2(3.0×10-3 kmol•m-3) and NTA(0.1 kmol•m-3) at pH 9.5 and deposition potential of -0.6 V.<br>    (2) Various thermoelectric power properties such as semi-conductor type, electro-conductivity, Seebeck factor and power factor have been measured and evaluated for the crystalline Bi2Te3 and other Bi-Te deposited films, as deposited and after heat-treated. It has been shown those properties of the heat-treated crystalline Bi2Te3 film has similar or superior thermo-electric properties with those made by MOCVD or a acidic solution process.<br>

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