High-Mobility Conjugated Polymers Based on Fused-Thiophene Building Blocks

2011 ◽  
Vol 212 (5) ◽  
pp. 428-443 ◽  
Author(s):  
Yao Liu ◽  
Yunqi Liu ◽  
Xiaowei Zhan
Keyword(s):  
Conjugated Polymers ◽  
High Mobility ◽  
Building Blocks

scholarly journals Synthesis of π-Conjugated Polymers Containing Benzotriazole Units via Palladium-Catalyzed Direct C-H Cross-Coupling Polycondensation for OLEDs Applications

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 254
Author(s):  
Dong Han ◽  
Jingwen Li ◽  
Qiang Zhang ◽  
Zewang He ◽  
Zhiwei Wu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Quantum Efficiency ◽  
Cross Coupling ◽  
Building Blocks ◽  
Gravimetric Analysis ◽  
19F Nmr Spectra ◽  
Light Emitting ◽  
Molecular Weights ◽  
Palladium Catalyzed ◽  
Red Luminescence

Four D-π-A conjugated polymers, namely P1–P4, which contain benzotriazole building blocks in their backbone as acceptor, are synthesized via palladium-catalyzed direct C-H cross-coupling polycondensation of 5,6-difluorobenzotriazole with different thiophene derivatives, including 3-octylthiophene, 2,2’-bithiophene, thieno[3,4-b][1,4]dioxine, and 4,4-dioctyl-4H-silolo-[3,2-b:4,5-b’]dithiophene as donor units, respectively. Taking the polymer P1 as an example, the chemical structure of the polymer is demonstrated by 1H and 19F NMR spectra. The optical, electrochemical, and thermal properties of these polymers are assessed by UV–vis absorption and fluorescence spectroscopy, cyclic voltammetry (CV), and thermal gravimetric analysis (TGA), respectively. DFT simulations of all polymers are also performed to understand their physicochemical properties. Furthermore, P1 and P2, which have relatively higher molecular weights and better fluorescent quantum efficiency than those of P3 and P4, are utilized as lighting emitters for organic light-emitting diodes (OLEDs), affording promising green and red luminescence with 0.07% and 0.14% of maximum external quantum efficiency, respectively, based on a device with an architecture of ITO/PEDOT:PSS/PTAA/the polymer emitting layer/TPBi/LiF/Al.

scholarly journals Stacking-engineered ferroelectricity in bilayer boron nitride

Science ◽  
2021 ◽  
pp. eabd3230
Author(s):  
Kenji Yasuda ◽  
Xirui Wang ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
Pablo Jarillo-Herrero
Keyword(s):  
Boron Nitride ◽  
Nonvolatile Memory ◽  
Rational Design ◽  
Parent Compound ◽  
High Mobility ◽  
Building Blocks ◽  
Electric Polarization ◽  
Experimental Realization ◽  
Polar Crystal ◽  
Memory Applications

2D ferroelectrics with robust polarization down to atomic thicknesses provide building blocks for functional heterostructures. Experimental realization remains challenging because of the requirement of a layered polar crystal. Here, we demonstrate a rational design approach to engineering 2D ferroelectrics from a non-ferroelectric parent compound via employing van der Waals assembly. Parallel-stacked bilayer boron nitride exhibits out-of-plane electric polarization that reverses depending on the stacking order. The polarization switching is probed via the resistance of an adjacently stacked graphene sheet. Twisting the boron nitride sheets by a small angle changes the dynamics of switching thanks to the formation of moiré ferroelectricity with staggered polarization. The ferroelectricity persists to room temperature while keeping the high mobility of graphene, paving the way for potential ultrathin nonvolatile memory applications.

Structure Design for High Performance n-Type Polymer Thermoelectric Materials

2021 ◽  
Author(s):  
Qi Zhang ◽  
Hengda Sun ◽  
Meifang Zhu
Keyword(s):  
Conjugated Polymers ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Waste Heat ◽  
Building Blocks ◽  
Structure Design ◽  
Potential Candidate ◽  
Polymer Backbone ◽  
P Type ◽  
Polymer Thermoelectric

Abstract Organic thermoelectric (OTE) materials have been regarded as a potential candidate to harvest waste heat from complex, low temperature surfaces of objects and convert it into electricity. Recently, n-type conjugated polymers as organic thermoelectric materials have aroused intensive research in order to improve their performance to match up with their p-type counterpart. In this review, we discuss aspects that affect the performance of n-type OTEs, and further focus on the effect of planarity of backbone on doping efficiency and eventually the TE performance. We then summarize strategies such as implementing rigid n-type polymer backbone or modifying conventional polymer building blocks for more planar conformation. In the outlook part, we conclude forementioned devotions and point out new possibility that may promote the future development of this field.

Polaron Localization at Interfaces in High-Mobility Microcrystalline Conjugated Polymers

2009 ◽  
Vol 21 (37) ◽  
pp. 3759-3763 ◽  
Author(s):  
N. Zhao ◽  
Y.-Y. Noh ◽  
J.-F. Chang ◽  
M. Heeney ◽  
I. McCulloch ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
High Mobility

Well-defined alternative polymer semiconductor using large size regioregular building blocks as monomers: electrical and electrochemical properties

2018 ◽  
Vol 6 (21) ◽  
pp. 5662-5670 ◽  
Author(s):  
Bogyu Lim ◽  
Dang Xuan Long ◽  
Song-Yi Han ◽  
Yoon-Chae Nah ◽  
Yong-Young Noh
Keyword(s):  
Molecular Weight ◽  
Conjugated Polymers ◽  
Electrochemical Properties ◽  
Building Blocks ◽  
Synthetic Strategy ◽  
Large Size ◽  
Large Molecular Weight ◽  
Polymer Semiconductor

We report an effective synthetic strategy to achieve well-defined regioregular alternative conjugated polymers using large molecular weight regioregular monomers.

scholarly journals High-performance, semiconducting membrane composed of ultrathin, single-crystal organic semiconductors

2019 ◽  
Vol 117 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Tatsuyuki Makita ◽  
Shohei Kumagai ◽  
Akihito Kumamoto ◽  
Masato Mitani ◽  
Junto Tsurumi ◽  
...  
Keyword(s):  
Single Crystal ◽  
Organic Semiconductors ◽  
High Performance ◽  
Printed Electronics ◽  
Electronic Device ◽  
Molecular Layer ◽  
High Mobility ◽  
Building Blocks ◽  
Solution Processed ◽  
Transfer Method

Thin film transistors (TFTs) are indispensable building blocks in any electronic device and play vital roles in switching, processing, and transmitting electronic information. TFT fabrication processes inherently require the sequential deposition of metal, semiconductor, and dielectric layers and so on, which makes it difficult to achieve reliable production of highly integrated devices. The integration issues are more apparent in organic TFTs (OTFTs), particularly for solution-processed organic semiconductors due to limits on which underlayers are compatible with the printing technologies. We demonstrate a ground-breaking methodology to integrate an active, semiconducting layer of OTFTs. In this method, a solution-processed, semiconducting membrane composed of few-molecular-layer–thick single-crystal organic semiconductors is exfoliated by water as a self-standing ultrathin membrane on the water surface and then transferred directly to any given underlayer. The ultrathin, semiconducting membrane preserves its original single crystallinity, resulting in excellent electronic properties with a high mobility up to 12cm2⋅V−1⋅s−1. The ability to achieve transfer of wafer-scale single crystals with almost no deterioration of electrical properties means the present method is scalable. The demonstrations in this study show that the present transfer method can revolutionize printed electronics and constitute a key step forward in TFT fabrication processes.

Synthesis of 3,7-diiodo-2,6-di(thiophen-2-yl)benzo[1,2-b:4,5-b′]difurans: functional building blocks for the design of new conjugated polymers

2012 ◽  
Vol 48 (71) ◽  
pp. 8919 ◽  
Author(s):  
Brandon M. Kobilka ◽  
Anton V. Dubrovskiy ◽  
Monique D. Ewan ◽  
Aimée L. Tomlinson ◽  
Richard C. Larock ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Blocks
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