Thermoelectric Transport Properties of Cu Nanoprecipitates Embedded Bi 2 Te 2.7 Se 0.3

Abstract EN

We suggest a simple and scalable synthesis to prepare Cu- Bi 2 Te 2.7 Se 0.3 (Cu-BTS) nanocomposites.

By precipitating Cu nanoparticle (NP) in colloidal suspension of as-exfoliated BTS, homogeneous mixtures of Cu NP and BTS nanosheet were readily achieved, and then the sintered nanocomposites were fabricated by spark plasma sintering technique using the mixed powder as a raw material.

The precipitated Cu NPs in the BTS matrix effectively generated nanograin (BTS) and heterointerface (Cu/BTS) structures.

The maximum Z T of 0.90 at 400 K, which is 15% higher compared to that of pristine BTS, was obtained in 3 vol% Cu-BTS nanocomposite.

The enhancement of Z T resulted from improved power factor by carrier filtering effect due to the Cu nanoprecipitates in the BTS matrix.