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Simple and effective fabrication of Sb2Te3 films embedded with Ag2Te nanoprecipitates for enhanced thermoelectric performance

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Abstract

The embedding of nanoprecipitates into a semiconducting matrix can lead to improved thermoelectric performances by enhancing the power factor or reducing the thermal conductivity of the system in which they are incorporated. Thus, we herein demonstrate the successive annealing of an electrodeposited amorphous Ag–Sb–Te film for the simple and effective fabrication of a nanocomposite consisting of highly dense (∼6 vol%) β-Ag2Te nanoprecipitates in an Ag-doped Sb2Te3 matrix. During the annealing process, nanoscale (∼40 nm) β-Ag2Te precipitates were generated spontaneously due to differences in the binding energies of the Ag–Te and Sb–Te bonds. As a result, the electron-transport properties of the p-type Sb2Te3 were significantly enhanced in the presence of the β-Ag2Te nanoprecipitates owing to an energy-dependent carrier-filtering effect at the Ag-doped Sb2Te3/β-Ag2Te interface. Furthermore, a high power factor of 1870 μW m−1 K−2 was obtained at 300 K due to the increased density of states effective mass (m* ∼1.8m0) without any significant deterioration in the electrical conductivity being observed.

Graphical abstract: Simple and effective fabrication of Sb2Te3 films embedded with Ag2Te nanoprecipitates for enhanced thermoelectric performance

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Publication details

The article was received on 13 Oct 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Communication
DOI: 10.1039/C7TA09013G
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Simple and effective fabrication of Sb2Te3 films embedded with Ag2Te nanoprecipitates for enhanced thermoelectric performance

    J. Kim, K. H. Lee, S. Kim, J. Lim and Nosang V. Myung, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA09013G

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