Journal
NANOSCALE
Volume 8, Issue 21, Pages 10885-10890Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr07032e
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Funding
- KRICT Core Project [KK 1507-C06]
- R&D Convergence Program of the National Research Council of Science and Technology of the Republic of Korea
- National Research Council of Science & Technology (NST), Republic of Korea [SI1602] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Solution-processable telluride-based heterostructures coated with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (Te-Bi2Te3/PEDOT:PSS) were synthesized through a solution-phase reaction at low temperatures. The water-based synthesis yielded PEDOT:PSS-coated Te-Bi2Te3 nano-barbell structures with a high Seebeck coefficient that can be stably dispersed in water. These hybrid solutions were deposited onto a substrate by the spray-printing method to prepare thermoelectric generators. The thermoelectric properties of the Te-Bi2Te3/PEDOT:PSS hybrid films were significantly enhanced by a simple acid treatment due to the increased electrical conductivity, and the power factor of those materials can be effectively tuned over a wide range depending on the acid concentration of the treatment. The power factors of the synthesized Te-Bi2Te3/PEDOT: PSS hybrids were optimized to 60.05 mu W m(-1) K-2 with a Seebeck coefficient of 93.63 mu V K-1 and an electrical conductivity of 69.99 S cm(-1). The flexible thermoelectric generator fabricated by spray-printing Te-Bi2Te3/PEDOT: PSS hybrid solutions showed an open-circuit voltage of 1.54 mV with six legs at Delta T = 10 degrees C. This approach presents the potential for realizing printing-processable hybrid thermoelectric materials for application in flexible thermoelectric generators.
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