Abstract:Flexible thin films of poly(nickel-ethylenetetrathiolate) prepared by an electrochemical method display promising n-type thermoelectric properties with the highest ZT value up to 0.3 at room temperature. Coexistence of high electrical conductivity and high Seebeck coefficient in this coordination polymer is attributed to its degenerate narrow-bandgap semiconductor behavior.
“…This deduction is confirmed by the simulation results (Supplementary Fig. 13-14 and Supplementary Note 4), from which an effective cooling of 25 K and a high heat-flux pumping capacity >600 W cm −2 are predicted if ultrathin (<10 µm) vertical OTE devices can be fabricated with reported in-plane performance ( ZT > 0.2) 3–6,21 , ideal ohmic contacts, and an optimized interfacial thermal resistance 16,26 .Fig. 4Real-time characterization of the temperature differences.…”
Section: Discussionsupporting
confidence: 63%
“…Poly(Ni-ett) is used as an OTE material because of its prominent TE performance and excellent stability 21 . The involved thermal processes of a conventional thin-film device with lateral geometry, which is composed by two gold electrodes and the poly(Ni-ett) film, are depicted in Supplementary Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The precursor was prepared according to the literature 21 . Electrochemical polymerization was performed in a one-compartment cell in a glove box.…”
Section: Methodsmentioning
confidence: 99%
“…1), making studies on Peltier effect a complicated issue. Precise extraction of the Peltier effect in OTE materials is particularly challenging because of the large contribution of Joule heating caused by the relative low electrical conductivity of OTE materials 3–7,21 , and significant effect of heat dissipation on the measured temperature distribution result from their relative low thermal conductivity. More importantly, the highly anisotropic performance ( ZT ⫽ ≫ ZT ⊥ ) in OTE films impedes investigations of their Peltier effect in the dominant charge transport direction using bulk materials with sandwiching device architecture.…”
Organic materials are emerging thermoelectric candidates for flexible power generation and solid-cooling applications. Although the Peltier effect is a fundamental thermoelectric effect that enables site-specific and on-demand cooling applications, the Peltier effect in organic thermoelectric films have not been investigated. Here we experimentally observed and quasi-quantitatively evaluated the Peltier effect in a poly(Ni-ett) film through the fabrication of thermally suspended devices combined with an infrared imaging technique. The experimental and simulation results confirm effective extraction of the Peltier effect and verify the Thomson relations in organic materials. More importantly, the working device based on poly(Ni-ett) film yields maximum temperature differences as large as 41 K at the two contacts and a cooling of 0.2 K even under heat-insulated condition. This exploration of the Peltier effect in organic thermoelectric films predicts that organic materials hold the ultimate potential to enable flexible solid-cooling applications.
“…This deduction is confirmed by the simulation results (Supplementary Fig. 13-14 and Supplementary Note 4), from which an effective cooling of 25 K and a high heat-flux pumping capacity >600 W cm −2 are predicted if ultrathin (<10 µm) vertical OTE devices can be fabricated with reported in-plane performance ( ZT > 0.2) 3–6,21 , ideal ohmic contacts, and an optimized interfacial thermal resistance 16,26 .Fig. 4Real-time characterization of the temperature differences.…”
Section: Discussionsupporting
confidence: 63%
“…Poly(Ni-ett) is used as an OTE material because of its prominent TE performance and excellent stability 21 . The involved thermal processes of a conventional thin-film device with lateral geometry, which is composed by two gold electrodes and the poly(Ni-ett) film, are depicted in Supplementary Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The precursor was prepared according to the literature 21 . Electrochemical polymerization was performed in a one-compartment cell in a glove box.…”
Section: Methodsmentioning
confidence: 99%
“…1), making studies on Peltier effect a complicated issue. Precise extraction of the Peltier effect in OTE materials is particularly challenging because of the large contribution of Joule heating caused by the relative low electrical conductivity of OTE materials 3–7,21 , and significant effect of heat dissipation on the measured temperature distribution result from their relative low thermal conductivity. More importantly, the highly anisotropic performance ( ZT ⫽ ≫ ZT ⊥ ) in OTE films impedes investigations of their Peltier effect in the dominant charge transport direction using bulk materials with sandwiching device architecture.…”
Organic materials are emerging thermoelectric candidates for flexible power generation and solid-cooling applications. Although the Peltier effect is a fundamental thermoelectric effect that enables site-specific and on-demand cooling applications, the Peltier effect in organic thermoelectric films have not been investigated. Here we experimentally observed and quasi-quantitatively evaluated the Peltier effect in a poly(Ni-ett) film through the fabrication of thermally suspended devices combined with an infrared imaging technique. The experimental and simulation results confirm effective extraction of the Peltier effect and verify the Thomson relations in organic materials. More importantly, the working device based on poly(Ni-ett) film yields maximum temperature differences as large as 41 K at the two contacts and a cooling of 0.2 K even under heat-insulated condition. This exploration of the Peltier effect in organic thermoelectric films predicts that organic materials hold the ultimate potential to enable flexible solid-cooling applications.
“…Taking into account the very recent research of poly[K x (Ni-et)] [55], it is one of the most promising n-type materials due to its excellent thermoelectric properties. Despite the very simple synthesis (Figure 2), chemical structure of this polymer is still not exhaustively clear, and is currently the research object.…”
Section: Thermoelectrics For Power Generation -A Look At Trends In Thmentioning
This chapter addresses recent progress in the ield of polymer thermoelectric materials. It covers a brief introduction to intrinsically conductive polymers and its motivation for thermoelectric utilization. A review about important and recent literature in the ield of p-type and n-type polymers for thermoelectric applications is summarized here. For a beter understanding of material development issues, doping mechanisms for intrinsically conducting polymers are discussed. Special emphasis is given to n-type polymers, since this group of polymers is often neglected due to unavailability or poor stability during processing. Diferent possibilities in terms of generator design and fabrication are presented. Recent challenges in this scientiic ield are discussed in respect to current material development, uncertainty during the measurement of thermoelectric properties as well as temperature stability for the most prominent p-type polymer used for thermoelectric, PEDOT:PSS.
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