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A Chemically Doped Naphthalenediimide‐Bithiazole Polymer for n‐Type Organic Thermoelectrics 下载免费PDF全文
Suhao Wang Hengda Sun Gang Wang Uwe Lappan Yuttapoom Puttisong Zhihua Chen Magnus Berggren Xavier Crispin Anton Kiriy Brigitte Voit Tobin J. Marks Simone Fabiano Antonio Facchetti 《Advanced materials (Deerfield Beach, Fla.)》2018,30(31)
The synthesis of a novel naphthalenediimide (NDI)‐bithiazole (Tz2)‐based polymer [P(NDI2OD‐Tz2)] is reported, and structural, thin‐film morphological, as well as charge transport and thermoelectric properties are compared to the parent and widely investigated NDI‐bithiophene (T2) polymer [P(NDI2OD‐T2)]. Since the steric repulsions in Tz2 are far lower than in T2, P(NDI2OD‐Tz2) exhibits a more planar and rigid backbone, enhancing π–π chain stacking and intermolecular interactions. In addition, the electron‐deficient nature of Tz2 enhances the polymer electron affinity, thus reducing the polymer donor–acceptor character. When n‐doped with amines, P(NDI2OD‐Tz2) achieves electrical conductivity (≈0.1 S cm?1) and a power factor (1.5 µW m?1 K?2) far greater than those of P(NDI2OD‐T2) (0.003 S cm?1 and 0.012 µW m?1 K?2, respectively). These results demonstrate that planarized NDI‐based polymers with reduced donor–acceptor character can achieve substantial electrical conductivity and thermoelectric response. 相似文献
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Solubility‐Limited Extrinsic n‐Type Doping of a High Electron Mobility Polymer for Thermoelectric Applications 下载免费PDF全文
Ruth A. Schlitz Fulvio G. Brunetti Anne M. Glaudell P. Levi Miller Michael A. Brady Christopher J. Takacs Craig J. Hawker Michael L. Chabinyc 《Advanced materials (Deerfield Beach, Fla.)》2014,26(18):2825-2830
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Wen‐Ya Lee Hung‐Chin Wu Chien Lu Benjamin D. Naab Wen‐Chang Chen Zhenan Bao 《Advanced materials (Deerfield Beach, Fla.)》2017,29(16)
This study demonstrates a facile way to efficiently induce strong memory behavior from common p‐type conjugated polymers by adding n‐type dopant 2‐(2‐methoxyphenyl)‐1,3‐dimethyl‐2,3‐dihydro‐1H‐benzoimidazole. The n‐type doped p‐channel conjugated polymers not only enhance n‐type charge transport characteristics of the polymers, but also facilitate to storage charges and cause reversible bistable (ON and OFF states) switching upon application of gate bias. The n‐type doped memory shows a large memory window of up to 47 V with an on/off current ratio larger than 10 000. The charge retention time can maintain over 100 000 s. Similar memory behaviors are also observed in other common semiconducting polymers such as poly(3‐hexyl thiophene) and poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene], and a high mobility donor–acceptor polymer, poly(isoindigo‐bithiophene). In summary, these observations suggest that this approach is a general method to induce memory behavior in conjugated polymers. To the best of the knowledge, this is the first report for p‐type polymer memory achieved using n‐type charge‐transfer doping. 相似文献
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Power Factor Enhancement in Solution‐Processed Organic n‐Type Thermoelectrics Through Molecular Design 下载免费PDF全文
Fulvio G. Brunetti P. Levi Miller Erin E. Perry Shrayesh N. Patel Victor Ho William B. Chang Jeffrey J. Urban Michael L. Chabinyc Craig J. Hawker Rachel A. Segalman 《Advanced materials (Deerfield Beach, Fla.)》2014,26(21):3473-3477
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N‐Type Organic Thermoelectrics: Improved Power Factor by Tailoring Host–Dopant Miscibility 下载免费PDF全文
Jian Liu Li Qiu Giuseppe Portale Marten Koopmans Gert ten Brink Jan C. Hummelen L. Jan Anton Koster 《Advanced materials (Deerfield Beach, Fla.)》2017,29(36)
In this contribution, for the first time, the polarity of fullerene derivatives is tailored to enhance the miscibility between the host and dopant molecules. A fullerene derivative with a hydrophilic triethylene glycol type side chain (PTEG‐1) is used as the host and (4‐(1,3‐dimethyl‐2,3‐dihydro‐1H‐benzoimidazol‐2‐yl)phenyl)dimethylamine n ‐DMBI) as the dopant. Thereby, the doping efficiency can be greatly improved to around 18% (<1% for a nonpolar reference sample) with optimized electrical conductivity of 2.05 S cm?1, which represents the best result for solution‐processed fullerene derivatives. An in‐depth microstructural study indicates that the PTEG‐1 molecules readily form layered structures parallel to the substrate after solution processing. The fullerene cage plane is alternated by the triethylene glycol side chain plane; the n ‐DMBI dopants are mainly incorporated in the side chain plane without disturbing the π–π packing of PTEG‐1. This new microstructure, which is rarely observed for codeposited thin films from solution, formed by PTEG‐1 and n ‐DMBI molecules explains the increased miscibility of the host/dopant system at a nanoscale level and the high electrical conductivity. Finally, a power factor of 16.7 µW m?1 K?2 is achieved at 40% dopant concentration. This work introduces a new strategy for improving the conductivity of solution‐processed n‐type organic thermoelectrics. 相似文献
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High Conductivity in Molecularly p‐Doped Diketopyrrolopyrrole‐Based Polymer: The Impact of a High Dopant Strength and Good Structural Order 下载免费PDF全文
Yevhen Karpov Tim Erdmann Ivan Raguzin Mahmoud Al‐Hussein Marcus Binner Uwe Lappan Manfred Stamm Kirill L. Gerasimov Tetyana Beryozkina Vasiliy Bakulev Denis V. Anokhin Dimitri A. Ivanov Florian Günther Sibylle Gemming Gotthard Seifert Brigitte Voit Riccardo Di Pietro Anton Kiriy 《Advanced materials (Deerfield Beach, Fla.)》2016,28(28):6003-6010
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Zewdneh Genene Wendimagegn Mammo Ergang Wang Mats R. Andersson 《Advanced materials (Deerfield Beach, Fla.)》2019,31(22)
All‐polymer solar cells (all‐PSCs) based on n‐ and p‐type polymers have emerged as promising alternatives to fullerene‐based solar cells due to their unique advantages such as good chemical and electronic adjustability, and better thermal and photochemical stabilities. Rapid advances have been made in the development of n‐type polymers consisting of various electron acceptor units for all‐PSCs. So far, more than 200 n‐type polymer acceptors have been reported. In the last seven years, the power conversion efficiency (PCE) of all‐PSCs rapidly increased and has now surpassed 10%, meaning they are approaching the performance of state‐of‐the‐art solar cells using fullerene derivatives as acceptors. This review discusses the design criteria, synthesis, and structure–property relationships of n‐type polymers that have been used in all‐PSCs. Additionally, it highlights the recent progress toward photovoltaic performance enhancement of binary, ternary, and tandem all‐PSCs. Finally, the challenges and prospects for further development of all‐PSCs are briefly considered. 相似文献
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Huiliang Sun Yumin Tang Chang Woo Koh Shaohua Ling Ruizhi Wang Kun Yang Jianwei Yu Yongqiang Shi Yingfeng Wang Han Young Woo Xugang Guo 《Advanced materials (Deerfield Beach, Fla.)》2019,31(15)
A novel imide‐functionalized arene, di(fluorothienyl)thienothiophene diimide (f‐FBTI2), featuring a fused backbone functionalized with electron‐withdrawing F atoms, is designed, and the synthetic challenges associated with highly electron‐deficient fluorinated imide are overcome. The incorporation of f‐FBTI2 into polymer affords a high‐performance n‐type semiconductor f‐FBTI2‐T, which shows a reduced bandgap and lower‐lying lowest unoccupied molecular orbital (LUMO) energy level than the polymer analog without F or with F‐functionalization on the donor moiety. These optoelectronic properties reflect the distinctive advantages of fluorination of electron‐deficient acceptors, yielding “stronger acceptors,” which are desirable for n‐type polymers. When used as a polymer acceptor in all‐polymer solar cells, an excellent power conversion efficiency of 8.1% is achieved without any solvent additive or thermal treatment, which is the highest value reported for all‐polymer solar cells except well‐studied naphthalene diimide and perylene diimide‐based n‐type polymers. In addition, the solar cells show an energy loss of 0.53 eV, the smallest value reported to date for all‐polymer solar cells with efficiency > 8%. These results demonstrate that fluorination of imide‐functionalized arenes offers an effective approach for developing new electron‐deficient building blocks with improved optoelectronic properties, and the emergence of f‐FBTI2 will change the scenario in terms of developing n‐type polymers for high‐performance all‐polymer solar cells. 相似文献