Journal
MATERIALS TODAY ENERGY
Volume 32, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2022.101233
Keywords
Single-walled carbon nanotube; Conjugated thienothiophene polymer; Composite doping; Thermoelectric generator; Carrier transport
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The thermolectric properties of all-organic composites fabricated with a polymeric system and single-walled carbon nanotubes (SWCNTs) were investigated. It was found that SWCNTs, when hybridized with the polymer, exhibited improved thermoelectric performance, which was further enhanced through p-doping with ferric chloride.
Quasi one-dimensional (1D) carbon nanostructures hybridized with p-conjugated polymeric systems are vastly explored for their unique heat/carrier transport beneficial for thermoelectric (TE) applications. We present the TE response of all-organic composites fabricated with poly[4,8-bis(5-(2-ethylyhexyl)thio-phene-2-yl)benzo[1,2-b; 4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)3-fiuorothieno[3,4-b']thio-phene-)-2-carboxylate-2-6-diyl)] (PBDTT-FTTE) and single-walled carbon nanotube (SWCNT). SWCNTs form strong pi-pi interfacial interactions with the polymer, and their TE performance is improved through p-doping with ferric chloride (FeCl3). Investigation of the electrical conductivity (u) and Seebeck coef-ficient (alpha) reveals a characteristic mechanism arising from low-energy carrier filtering and Fermi-level pinning. DIGIMAT-MF (c) material modeling platform simulates sigma and thermal conductivity (k) and in-dicates a CNT aspect ratio distribution in the system. The doped composite with 55 wt% SWCNT exhibits the maximum ZT value of 0.044 at 303 K using the simulated k value. A fiexible TE generator (TEG) consisting of 21 legs is dispenser printed that produces similar to 32.7 nW power output with a 65 K temperature gradient across 15 kU load resistance. COMSOL Multiphysics (R) simulation is used to optimize TEG design for maximum extractable output power. (c) 2022 Elsevier Ltd. All rights reserved.
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