Thermoelectric properties of thiospinels In1-x@xIn2S4-yTey

该项目旨在改善In 1-x@xIn2S4（@ =空位）硫尖晶石的热电（TE）性能。这些n型半导体是有前途的材料，可以用作基于环境友好的天然矿物黝铜矿的TE发电机中的对应物。在In 1-x@xIn2S4中，Te对S的等价取代有望提高电荷载流子的迁移率，从而改善此类材料的电输运性质。为了研究In0.84@0.16In2S4-yTey、In0.78@0.22In2S4-yTey和In0.67@0.33In2S4-yTey（y = 0.1，0.2，0.3）（即具有共同式In 1-x@xIn2S4-yTey的硫化物）的TE行为，将进行它们的合成、彻底表征、晶体结构细化以及电和热输运性质的测量。作为测量声子热导率的一种替代方法，我们将使用显微拉曼光谱，结合固态化学和物理的方法，分析上述硫尖晶石的组成、载流子浓度和迁移率之间的关系。对这些关系的理解将有助于含硫n型热电材料的发展。

The proposed project aims an improvement of thermoelectric (TE) performance of the In1-x@xIn2S4 (@ = vacancy) thiospinels. These n-type semiconductors are promising materials, which can be used as a counterpart in TE generators based on the environmental friendly natural mineral tetrahedrite. The isovalent substitutions of S by Te in In1-x@xIn2S4 is expected to enhance the mobility of charge carriers and thus, to improve electrical transport properties of such materials. To study TE behavior of In0.84@0.16In2S4-yTey, In0.78@0.22In2S4-yTey and In0.67@0.33In2S4-yTey (y = 0.1, 0.2, 0.3) (i.e. sulfides with common formula In1-x@xIn2S4-yTey) their syntheses, thorough characterization, crystal structure refinement as well as measurements of electrical and thermal transport properties will be performed. As an alternative method for the measurements of phononic thermal conductivity the micro-Raman spectroscopy will be used.Joining approaches from solid state chemistry and physics we will analyze the relationships between the compositions, charge carrier concentrations and their mobilities in the mentioned thiospinels. The understanding of such relationships will contribute to the development of Sulphur-containing n-type thermoelectric materials.