Selenium‐Substituted Diketopyrrolopyrrole Polymer for High‐Performance p‐Type Organic Thermoelectric Materials

Ding, Jiamin; Liu, Zitong; Zhao, Wenrui; Jin, Wen-Long; Xiang, Lanyi; Wang, Zhijie; Zeng, Yan; Zou, Ye; Zhang, Fengjiao; Yi, Yuanping; Diao, Ying; McNeill, Christopher R.; Di, Chong‐an; Zhang, Deqing; Zhu, Daoben

doi:10.1002/ange.201911058

Cited by 23 publications

(19 citation statements)

References 27 publications

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“…33,34,35 The major peak decreases together with the increase of a new broad peak at the near-infrared region when the FeCl3 concentration increases. The decrease of the major peak should be due to the reduction of the neutral state of DPP units, which are converted into polaron state or bipolaron state 36 that result in the increase of the new peak at the near-infrared region. Figure 3d shows a clear conversion process of P3HT between the neutral state, the polaron state, and the bipolaron state.…”

Section: Resultsmentioning

confidence: 99%

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

Wang

et al. 2021

Preprint

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The transport mechanism of organic materials is still far away from being well understood and controlled although conducting polymers have been discovered since 1977. It is rare to see conducting polyers possessing high bipolar (p- and n-type) electrical conductivities within a single bulk doped organic polymer without the assistant of gate voltage. Here, we report a novel approach to provide high performance n-type materials by p-type doping. More importantly, the bipolar electrical conductivities of the donor-acceptor conducting polymer are high, resulting high bipolar power factors among the solution-processable ambipolar D-A copolymers. A fully organic p-n junction is created in a planar film, exhibiting a high rectification ratio of 2 x 102 at +5 V with a high current density of 3 A/cm2. Structural and spectroscopic tests have been performed to provide a fundamental understanding of the polarity switching mechanism. The results open the opportunity of making p- and n-type modules with a single conducting polymer for future modern organic electronics.

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Section: Resultsmentioning

confidence: 99%

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

Wang

et al. 2021

Preprint

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“…1), indicating that the dopant concentration can be finely controlled to optimize the TE performance. [11][12][13][14][15][16][17] , transferrable TEs [18][19][20][21][22][23] and SWCNT-Bi 0.5 Sb 1.5 Te 3 hybrid at ~300 K. The ratios of corresponding electrical conductivity to thermal conductivity ( / ) for these TE materials are also indicated.…”

Section: Epitaxial Growth Of a Swcnt-nanocrystal Hybridmentioning

confidence: 99%

“…An n-type hybrid with compatible TE properties was prepared 11 and its detailed characteristics are shown in Supplementary Fig. 23. Two hybrid p-n couples were tailored by a lab-built femtosecond laser microfabrication system (Supplementary Video 2) and transferred onto a micro-chip (Fig.…”

Section: A Micro-ted Module For Cooling and Energy Harvestingmentioning

confidence: 99%

“…First, traditional inorganic TE materials are intrinsically rigid, and are largely restricted to building planar TEDs, which yield a low TE performance owing to the poor thermal contacts between the TED and curved heat source or sink. As a result, there have been tremendous efforts in recent years to develop flexible TE materials [11][12][13][14][15][16][17][18][19][20][21][22][23] . Nevertheless, limited by the degraded property of flexible TE materials and integration technology, the performance of current flexible TEDs [13][14][15]19,[24][25][26][27][28][29][30][31] is usually far worse than that of conventional ones.…”

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confidence: 99%

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A flexible micro-thermoelectric device from carbon nanotube-epitaxially grown (Bi,Sb)2Te3 nanocrystal

Jin¹,

Zhao²,

Long³

et al. 2021

Preprint

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Flexible thermoelectric (TE) materials have attracted increasing interest due to their potential applications in energy harvesting and high-spatial-resolution thermal management. However, a high-performance flexible micro-TE device (TED) compatible with the modern electronics fabrication process has not yet been developed. Here we report a general van der Waals epitaxial growth approach to fabricating a freestanding and flexible hybrid comprised of single-wall carbon nanotubes and highly ordered (Bi,Sb)2Te3 nanocrystals. High power factors ranging from ~1,680 to ~1,020 µW m−1 K−2 in the temperature range of 300-480 K, combined with a strongly depressed thermal conductivity yield an average figure of merit of ~0.81. A prototype flexible micro-TED module consisting of two p-n hybrids was then fabricated, which demonstrated an unprecedented open circuit voltage of ~22.7 mV and a power density of ~0.36 W cm−2 under a ~30 K temperature difference, and a net cooling temperature of ~22.4 K and a heat absorption density of ~92.5 W cm−2.

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“… 15 , 17 Furthermore, the diketopyrrolopyrrole (DPP)-based molecule could be placed between aromatic rings such as the five-membered heterocycle thiophene, 18 which creates the possibility of tuning their transport properties. In this work, stimulated by measurements of thermoelectricity in bulk DPP-based films, which show that a thermoelectric figure of merit of ZT = 0.25 could be achieved, 19 we examine how room-temperature quantum interference in DPP cores influences their charge and heat transport properties and assess whether or not DPP derivatives are potential thermoelectric materials at the nanoscale.…”

mentioning

confidence: 99%

Conformation and Quantum-Interference-Enhanced Thermoelectric Properties of Diphenyl Diketopyrrolopyrrole Derivatives

Almughathawi

Hou

et al. 2020

ACS Sens.

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Manipulating the connectivity of external electrodes to central rings of carbon-based molecules in single molecule junctions is an effective route to tune their thermoelectrical properties. Here we investigate the connectivity dependence of the thermoelectric properties of a series of thiophene-diketopyrrolopyrrole (DPP) derivative molecules using density functional theory and tight-binding modeling, combined with quantum transport theory. We find a significant dependence of electrical conductance on the connectivity of the two thiophene rings attached to the DPP core. Interestingly, for connectivities corresponding to constructive quantum interference (CQI), different isomers obtained by rotating the thiophene rings possess the same electrical conductance while those corresponding to destructive quantum interference (DQI) show huge conductance variations upon ring rotation. Furthermore, we find that DQI connectivity leads to enhanced Seebeck coefficients, which can reach 500–700 μV/K. After including the contribution to the thermal conductance from phonons, the full figure of merit ( ZT ) for the CQI molecules could reach 1.5 at room temperature and it would further increase to 2 when temperature elevates to 400 K. Finally, we demonstrate that doping with tetracyanoquinodimethane can change the sign of the Seebeck coefficients by forming a charge-transfer system with the DPP.

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Selenium‐Substituted Diketopyrrolopyrrole Polymer for High‐Performance p‐Type Organic Thermoelectric Materials

Cited by 23 publications

References 27 publications

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

A flexible micro-thermoelectric device from carbon nanotube-epitaxially grown (Bi,Sb)2Te3 nanocrystal

Conformation and Quantum-Interference-Enhanced Thermoelectric Properties of Diphenyl Diketopyrrolopyrrole Derivatives

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