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Heat‐Sink‐Free Flexible Organic Thermoelectric Generator Vertically Operating with Chevron Structure

Title
Heat‐Sink‐Free Flexible Organic Thermoelectric Generator Vertically Operating with Chevron Structure
Authors
KIM, DAEGUNJU, DUCKHYUNCHO, KIL WON
POSTECH Authors
CHO, KIL WON
Date Issued
Jan-2018
Publisher
WILEY
Abstract
Organic thermoelectric (TE) material receives increasing attention as a promising candidate for flexible TE generators, which is required for wearable applications such as self-powered electronics, sustainable mobile batteries, and medical sensors. Recent advances in TE figure-of-merit of organic TE material reach that of bulk inorganic TE material. However, organic TE material is not fully functionalized to the TE generator, which shows low power output, operates in a lateral heat flow, and requires an additional heat sink. A flexible organic TE generator is presented herein by introducing an optimized solution process, chevron device structure, and a foam medium. Optimized poly(3,4-ethylenedixoythiophene):polystyrene sulfonate (PEDOT:PSS) film involves a distinctive film morphology, achieving a high power factor (642 µW m−1 K−2) and a low sheet resistance (<10 Ω sq−1). A chevron-structured TE generator, integrating 24 PEDOT:PSS patterns, is highly flexible and yields a remarkable TE output (≈1 µW at ΔT = 17.5 K) in a vertical heat flow. In addition, internal thermal transport through the device is systematically controlled by the inserted medium, which enables the heat-sink-free operation of the TE generator retaining 70% of its maximum voltage output in the absence of an additional heat sink.
Organic thermoelectric (TE) material receives increasing attention as a promising candidate for flexible TE generators, which is required for wearable applications such as self-powered electronics, sustainable mobile batteries, and medical sensors. Recent advances in TE figure-of-merit of organic TE material reach that of bulk inorganic TE material. However, organic TE material is not fully functionalized to the TE generator, which shows low power output, operates in a lateral heat flow, and requires an additional heat sink. A flexible organic TE generator is presented herein by introducing an optimized solution process, chevron device structure, and a foam medium. Optimized poly(3,4-ethylenedixoythiophene):polystyrene sulfonate (PEDOT:PSS) film involves a distinctive film morphology, achieving a high power factor (642 µW m−1 K−2) and a low sheet resistance (<10 Ω sq−1). A chevron-structured TE generator, integrating 24 PEDOT:PSS patterns, is highly flexible and yields a remarkable TE output (≈1 µW at ΔT = 17.5 K) in a vertical heat flow. In addition, internal thermal transport through the device is systematically controlled by the inserted medium, which enables the heat-sink-free operation of the TE generator retaining 70% of its maximum voltage output in the absence of an additional heat sink.
Keywords
Conducting polymers; Flexible electronics; Heat sinks; Heat transfer; Oil field development; Thermal management (electronics); Thermoelectric equipment; Chevron structures; Energy Harvester; Optimized solutions; Polystyrene sulfonate; Thermo-electric generators; Thermoelectric material; Thermoelectrics; Wearable applications; Electric machine control
URI
http://oasis.postech.ac.kr/handle/2014.oak/41024
DOI
10.1002/admt.201700335
ISSN
2365-709X
Article Type
Article
Citation
ADVANCED MATERIALS TECHNOLOGIES, vol. 1, no. 12, 2018-01
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조길원CHO, KIL WON
Dept. of Chemical Enginrg
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