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Fabrication and Characterization of a Hybrid Bi 2 Se 3 /Organic Superlattice for Thermoelectric Energy Conversion
Author(s) -
Zong PengAn,
Zhang Peng,
Yin Shujia,
Huang Yujia,
Wang Yiliang,
Wan Chunlei
Publication year - 2019
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800842
Subject(s) - superlattice , materials science , thermoelectric effect , thermoelectric materials , intercalation (chemistry) , fabrication , nanotechnology , optoelectronics , thermal conductivity , chemical engineering , inorganic chemistry , composite material , thermodynamics , chemistry , medicine , physics , alternative medicine , pathology , engineering
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 Bi 2 Se 3 hexylamm‐onium 0.11 dimethylsulfoxide 0.06 (Bi 2 Se 3 HA 0.11 DMSO 0.06 ) 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 Bi 2 Se 3 layers and form a triple‐layer structure, where the hexylammonium ions are ionically bonded to the negatively charged Bi 2 Se 3 layers. The lattice vibration modes of the Bi 2 Se 3 layers in this hybrid superlattice are found to be softened due to weakened interlayer interaction and phonon confinement effect. The hybrid Bi 2 Se 3 HA 0.11 DMSO 0.06 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 Bi 2 Se 3 ‐based inorganic/organic superlattices can stimulate exploration of novel high‐performance flexible thermoelectric materials by hybridizing inorganic and organic materials at the atomic scale.