Benzothienobenzothiophene‐Based Organic Charge Transfer Complex and Carbon Nanotube Composites for p‐Type and n‐Type Thermoelectric Materials and Generators

Qin, Shihui; Tan, Jiajia; Qin, Jinfeng; Luo, Jiye; Jin, Jiaoying; Huang, Shaobin; Wang, Lei; Liu, Danqing

doi:10.1002/aelm.202100557

Cited by 17 publications

(17 citation statements)

References 33 publications

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“…[ 20,44–47 ] Part of the injected charges are captured in a deeper energy level, and when the gate‐bias stress is removed, the injected charges can still be maintained in PS for a long time, stably modulating the operation of OFETs. [ 48–49 ] Moreover, with the increase of plasma treating time, the transfer curve moves to the negative direction gradually under the negative gate‐bias stress of 1 ms (Figure S6, Supporting Information), which proves that the hole injection capability of the device is improved. Real‐time response of the current at V g = −20 V & V d = −60 V, before and after voltage pulse of 0.1 s is illustrated in Figure S7, Supporting Information.…”

Section: Resultsmentioning

confidence: 83%

Rapid Charge Storage and Release at Etching‐Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses

Qiao

Wei

Xing

et al. 2022

Adv Materials Inter

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distribution within conductors is usually not practical. However, for insulator electrets carrying neat charges, the charges could be kinetically immobilized for a relatively long time in any position inside the insulator due to the high electrical resistance, while the electric field and charge density inside the electret are not kinetically zero. [1][2] Insulators could trap charges from the external electrical or photonic stimulus, referring to electrets, which are being developed for transistors, memories, and bio-mimic systems. [3][4][5][6][7][8][9][10][11][12] However, as compared with electrical conductors, insulators intrinsically have high electrical resistance, thus the charge injection and release typically require high voltage or long applied duration, which limits their applications in highspeed devices. [13] Nanocomposites [14][15][16] or floating-gate [17][18] architectures have been developed to improve the charge storage and release capability, which has been commercially applied for memory applications. The community is looking for new strategies to further tune the charge storage and release dynamics for advanced electronic and photonic applications. [6][7][19][20][21] Plasma, generated by electrical discharge, contains ionic or radical species and could interact with materials. Recently, plasma has been employed to etch materials for academic and industrial applications. Additionally, appropriate plasma treatment could potentially induce polar groups and thus electronic trap sites at the surface of the materials. [22][23][24] For instance, oxygen plasma-treated SiO 2 dielectric is used to generate polar trap sites to tune the performance of field-effect transistors. [25][26][27] However, the trap density on the surface of the inorganic materials is difficult to be satisfactorily manipulated within a large range by conventional plasma treatment, while this plasma treatment is applicable for only a few materials. On the other hand, as compared with inorganic materials, organic semiconductors or insulators usually interact with plasma species more fiercely. Conventional plasma could, unfortunately, deteriorate the etched materials, not only at the surface but also tens of nanometers away underneath the surface, which consequently damages the materials. [28] Recently, it is reported that soft plasma can be carefully generated by glow discharge at Insulator materials can trap charges, referring to electrets, which are attractive for transistors and memories. However, insulators intrinsically exhibit high electrical resistance, thus the charge injection and release inside insulators typically need high voltage or long bias time, limiting the applications that require high writing/erasing speed. In this work, insulator polymer polystyrene (PS) film is treated by a soft plasma, which selectively induces a high density of charge traps at the top surface, without changing the electronic properties of the underneath materials. The thus-prepared surface is easily occupied by external neat charges to form ...

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Section: Resultsmentioning

confidence: 83%

Rapid Charge Storage and Release at Etching‐Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses

Qiao

Wei

Xing

et al. 2022

Adv Materials Inter

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“…[ 145 ] Liu et al. [ 169 ] investigated the TE properties of the composite film with CTC of BTBTs‐F4TCNQ and SWCNT. The preset study had obtained high PFs of 244.3 µW m −1 K −2 for p‐type PhBTBT‐F 4 TCNQ/SWCNT composite film and 105.1 µW m −1 K −2 for n‐type C8BTBT‐F 4 TCNQ/SWCNT composite film at room temperature.…”

Section: The Recent Progress Of Small Molecular Ote Materialsmentioning

confidence: 99%

“…The PF of the C 8 -BTBT-TCNQ/SWCNT film is up to 284 μW m −1 K −2 and the enhanced TE performance is credited to the controlled charge transfer progress, the improved carrier mobilities, and the reduced the correlations between σ and S, synchronously. [145] Liu et al [169] investigated the TE properties of the composite film with CTC of BTBTs-F4TCNQ and SWCNT. The preset study had obtained high PFs of 244.3 μW m −1 K −2 for p-type PhBTBT-F 4 TCNQ/SWCNT composite film and 105.1 μW m −1 K −2 for n-type C8BTBT-F 4 TCNQ/SWCNT composite film at room temperature.…”

Section: The Development Of Organic Donor-acceptor Complexes Te Mater...mentioning

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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“…The output power of 2.36 µW is also higher than the values of reported p-n type TE generators based on organic composites (Table S3, Supporting Information). [43,[47][48][49][50] Moreover, the output powers of the TE generators still maintained about 40-50% after being exposed in air for one week (Figure S9, Supporting Information). Notably, the TE generator on SAMmodified substrates exhibits higher air stability than that on unmodified substrate.…”

Section: Thermoelectric Generator Performancementioning

confidence: 99%

Substrate Modification for High‐Performance Thermoelectric Materials and Generators Based on Polymer and Carbon Nanotube Composite

Huang

Chen

et al. 2022

Adv Materials Inter

Self Cite

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Polymer and carbon nanotube composites have aroused extensive attention for thermoelectric materials owing to the combination of low thermal conductivity of polymer and high electrical conductivity of carbon nanotubes. Surface properties of the substrate are of great importance for the charge transport behaviors of semiconducting thin films, which are less explored in thermoelectric applications. Herein, self‐assembled monolayers (SAMs) are used to modify the substrate for thermoelectric polymer composites. The trifluoromethyl (CF3)‐terminated SAM is beneficial for an improved electrical conductivity; while the SAM with amino group is found to improve their Seebeck coefficient and decrease the electrical conductivity. As a result, polymer composites on CF3‐SAM‐modified substrate show a high room‐temperature power factor of 285 µW m−1 K−2 and a large output power of 2.36 µW for thermoelectric generator at a temperature gradient of 50 K. This work demonstrates that surface modification by SAMs is a promising strategy for improving performance of thermoelectric materials and devices.

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Benzothienobenzothiophene‐Based Organic Charge Transfer Complex and Carbon Nanotube Composites for p‐Type and n‐Type Thermoelectric Materials and Generators

Cited by 17 publications

References 33 publications

Rapid Charge Storage and Release at Etching‐Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses

Rapid Charge Storage and Release at Etching‐Assist Electret in Organic Transistors for Memories, Photodetectors, and Artificial Synapses

Recent Advances and Prospects of Small Molecular Organic Thermoelectric Materials

Substrate Modification for High‐Performance Thermoelectric Materials and Generators Based on Polymer and Carbon Nanotube Composite

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