Co dopant drives surface smooth and improves power factor of evaporated SnSe films. Issue 10 (July 2020)

• Record Type: Journal Article
• Authors: Liu, Shiying; Lan, Mingdi; Li, Guojian; Yuan, Yi; Jia, Baohai; Wang, Qiang
• Is Part Of: Ceramics international. Volume 46:Issue 10(2020)Part B
• Page Start: 16578
• Page End: 16582
• Publication Date: 2020-07
• Subjects: Thermoelectric materials -- Films -- SnSe -- Vacuum thermal -- Evaporation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.03.229
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Unstable nanosheet morphology of polycrystalline SnSe film becomes a limitation for its application in the field of waste heat recovery. This study dopes Co into the evaporated SnSe film to smooth the surface and to improve power factor. The results show that Co dopant makes the rough nanosheet change to surface densely packed structure. The dopant Co forms Co particles distributing around SnSe grain boundary, which suppress SnSe (011) plane growth and subsequent reduce nanosheet formation. In addition, Co dopant increases electric conductivity through increasing the carrier concentration, but the magnetism of Co particles decreases carrier mobility due to spin-charge coupling and also affects the Seebeck coefficient. The power factor thus is improved after doped Co. This study presents a method to fabricate polycrystalline SnSe film with smooth surface morphology and high power factor.