Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale

Gueye, Magatte N.; Vercouter, Alexandre; Jouclas, Rémy; Guérin, David; Lemaur, Vincent; Schweicher, Guillaume; Lenfant, S.; Antidormi, Aleandro; Geerts, Yves; Melis, Claudio; Cornil, Jérôme; Vuillaume, D.

doi:10.1039/d0nr08619c

Cited by 14 publications

(20 citation statements)

References 73 publications

(105 reference statements)

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“…Moreover, it also demonstrated the weak dependence between thermal resistance and film thickness at the nanoscale. [60] In order to obtain high free carrier concentration and further optimize the thermal transport properties of OSCs, doping is one of the most effective methods. [61,20] Normally, doping would reduce the charge mobility although it can increase the carrier concentration.…”

Section: Charge Transport and Thermal Transport Propertiesmentioning

confidence: 99%

Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Xie

Liu

Sun

et al. 2022

Adv Funct Materials

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1]benzothieno[3,2-b]benzothiophene (BTBT), with two benzene rings as the outermost rings, is referred to as diacene-fused ladder-type π-conjugated thienothiophenes. During the last three decades, derivatives based on BTBT core have been extensively studied due to their tremendous application prospects in organic field-effect transistors (OFETs) and organic optoelectronic devices. In order to further advance the development of organic electronics, new materials are constantly being synthesized and new methods are constantly evolving. This review mainly focuses on the crystal and electronic structures of BTBT derivatives, the soluble and thermal properties, the fabrication methods, as well as the strategies for performance improvement and optoelectronic applications including OFETs, photodetectors, synaptic devices, and organic light-emitting transistors. As one of the most promising organic materials, the insight into BTBT-based molecules will accelerate their potential application and provide important reference value for the development toward commercialized and industrialized organic semiconducting products.

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Section: Charge Transport and Thermal Transport Propertiesmentioning

confidence: 99%

Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Xie

Liu

Sun

et al. 2022

Adv Funct Materials

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“…In addition, this structure–property relationship is consistent with a recent joint experimental and theoretical investigation of thermal transport properties of nonalkylated and alkylated BTBT derivatives probed by thermal scanning microscopy along the out‐of‐plane (interlayer) direction. [ 57 ] From a quantitative perspective, the effects of alkylation of DNTT lead to a decrease in the calculated in‐plane thermal conductivity by a factor of ≈2.3, with this drop being experimentally even more pronounced (a factor of ≈ 4). As mentioned earlier, our experimental data on the thermal conductivity of C8‐DNTT‐C8 are very similar to those observed in the state‐of‐the‐art fullerene derivatives PCBM and PCBNB; such a low thermal conductivity could be of great interest for the development of efficient thermoelectric applications.…”

Section: Resultsmentioning

confidence: 99%

Strong Suppression of Thermal Conductivity in the Presence of Long Terminal Alkyl Chains in Low‐Disorder Molecular Semiconductors

et al. 2021

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While the charge transport properties of organic semiconductors have been extensively studied over the recent years, the field of organics‐based thermoelectrics is still limited by a lack of experimental data on thermal transport and of understanding of the associated structure–property relationships. To fill this gap, a comprehensive experimental and theoretical investigation of the lattice thermal conductivity in polycrystalline thin films of dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (Cn‐DNTT‐Cn with n = 0, 8) semiconductors is reported. Strikingly, thermal conductivity appears to be much more isotropic than charge transport, which is confined to the 2D molecular layers. A direct comparison between experimental measurements (3ω–Völklein method) and theoretical estimations (approach‐to‐equilibrium molecular dynamics (AEMD) method) indicates that the in‐plane thermal conductivity is strongly reduced in the presence of the long terminal alkyl chains. This evolution can be rationalized by the strong localization of the intermolecular vibrational modes in C8‐DNTT‐C8 in comparison to unsubstituted DNTT cores, as evidenced by a vibrational mode analysis. Combined with the enhanced charge transport properties of alkylated DNTT systems, this opens the possibility to decouple electron and phonon transport in these materials, which provides great potential for enhancing the thermoelectric figure of merit ZT.

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“…[53] Several studies have demonstrated that the κ L of OTE materials makes more contribution to κ than κ e . [54,55] Thus, tuning the thermal properties for OTE materials can be achieved by intensifying phonon scattering, which can be modulated by changing the molecular arrangement and modifying structures. The results of the thermal transport by Chan et al indicated that there exist characteristics of obvious anisotropy of the thermal transport in dinaphtho[2,3-b:2′,3′-f ]thieno [3,2-b] thiophene (DNTT).…”

Section: Thermoelectric Parameters Of Materialsmentioning

confidence: 99%

Recent Advances and Prospects of Small Molecular Organic Thermoelectric Materials

Zhou

Zhang

Zheng

et al. 2022

Small

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Thermoelectric (TE) materials possess unique energy conversion capabilities between heat and electrical energy. Small organic semiconductors have aroused widespread attention for the fabrication of TE devices due to their advantages of low toxicity, large area, light weight, and easy fabrication. However, the low TE properties hinder their large‐scale commercial application. Herein, the basic knowledge about TE materials, including parameters affecting the TE performance and the remaining challenges of the organic thermoelectric (OTE) materials, are initially summarized in detail. Second, the optimization strategies of power factor, including the selection and design of dopants and structural modification of the dope‐host are introduced. Third, some achievements of p‐ and n‐type small molecular OTE materials are highlighted to briefly provide their future developing trend; finally, insights on the future development of OTE materials are also provided in this study.

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Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale

Cited by 14 publications

References 73 publications

Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Strong Suppression of Thermal Conductivity in the Presence of Long Terminal Alkyl Chains in Low‐Disorder Molecular Semiconductors

Recent Advances and Prospects of Small Molecular Organic Thermoelectric Materials

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