Synthesis and Properties of Bismuth Selenide Based Nanolaminates for Application in Thermoelectrics. Issue 21 (27th June 2022)

• Record Type: Journal Article
• Authors: Andzane, Jana; Felsharuk, Andrei; Buks, Krisjanis; Sarakovskis, Anatolijs; Niherysh, Kiryl; Gabrusenoks, Jevgenijs; Erts, Donats
• Is Part Of: Advanced materials interfaces. Volume 9:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-27
• Subjects: bismuth selenide -- doping -- nanolaminate -- physical vapor deposition -- thermoelectric properties -- ultrathin films; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202200385
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: In this work, simple and cost‐effective phyiscal vapor deposition method is applied for deposition of single Bi2 Se3, Bi1.925 Sn0.075 Se3, Bi2 Se2.975 Te0.025 ultrathin films of average thickness 10–12 nm, and for the fabrication of n‐type 5‐layer nanolaminates. The nanolaminates are composed from alternating doped and undoped ultrathin films. Electrical and thermoelectric properties (Seebeck coefficient, resistivity, electron thermal conductivity, charge carrier concentration, and mobility) of nanolaminates as well as single ultrathin undoped and doped films are studied at room temperature under ambient conditions. Both types of nanolaminates show 75–125% increase of the Seebeck coefficient accompanied by the 65–85% reduction of the electron thermal conductivity in comparison with the nanostructured bulk materials of similar chemical compositions. The mechanisms underlying such improvement of properties of studied nanolaminates in comparison with the nanostructured bulk counterparts are discussed. Abstract : Thermoelectrical properties of 5‐layer n‐type nanolaminates fabricated by physical vapor deposition are studied for the first time. It is found that the Seebeck coefficient of nanolaminates increases by ≈75–125% and the electron thermal conductivity decreases by 65–85% in comparison with the single ultrathin films and the values reported for the nanostructured bulk materials of similar chemical compositions.