Fabrication and Characterization of a Hybrid Bi2Se3/Organic Superlattice for Thermoelectric Energy Conversion. (29th March 2019)

• Record Type: Journal Article
• Authors: Zong, Peng‐An; Zhang, Peng; Yin, Shujia; Huang, Yujia; Wang, Yiliang; Wan, Chunlei
• Is Part Of: Advanced Electronic Materials. Volume 5:Number 11(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-03-29
• Subjects: Bi2Se3 -- hybrid -- inorganic–organic -- superlattice -- thermoelectric; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.201800842
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Hybrid inorganic/organic thermoelectric materials have recently gained increasing research interest, due to their mechanical flexibility and the wide tunability of their components and properties. In this Communication, a new strategy to fabricate an inorganic/organic superlattice of Bi2 Se3 hexylamm‐onium0.11 dimethylsulfoxide0.06 (Bi2 Se3 HA0.11 DMSO0.06 ) through a series of chemical reaction processes, including lithium intercalation, ionic exchange, and organic exchange, is put forward. It is shown that the organic molecules expand the interlayer space between the Bi2 Se3 layers and form a triple‐layer structure, where the hexylammonium ions are ionically bonded to the negatively charged Bi2 Se3 layers. The lattice vibration modes of the Bi2 Se3 layers in this hybrid superlattice are found to be softened due to weakened interlayer interaction and phonon confinement effect. The hybrid Bi2 Se3 HA0.11 DMSO0.06 shows a power factor of 950 µW m −1 K −2 at room temperature, among the best in n‐type flexible thermoelectric materials. A huge reduction of thermal conductivity is observed, which contributes to the large enhancement of zT value. The current research on Bi2 Se3 ‐based inorganic/organic superlattices can stimulate exploration of novel high‐performance flexible thermoelectric materials by hybridizing inorganic and organic materials at the atomic scale. Abstract : A novel inorganic/organic superlattice of Bi2 Se3 hexylammonium0.11 dimethylsulfoxide0.06 is fabricated via lithium intercalation, ionic exchange, and organic exchange. The intercalated organic molecules expand the interlayer spaces and introduce flexibility. A power factor of 950 µW m −1 K −2 at room temperature, combined with a huge reduction of thermal conductivity, leads to enhanced thermoelectric performance.