ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.3c02026
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12 Apr 08:41
[ASAP] Strategically Constructing a Hydrophilic Interface toward Ultrastable Zinc Metal Anodes
by Hai Wang, Jinxia Huang, Xiaobo Wang, Zhiguang Guo, and Weimin Liu
23 Oct 04:52
[ASAP] Real-Time Monitoring of Formation and Dynamics of Intra- and Interchain Phases in Single Molecules of Polyfluorene
by Tzu-Wei Tseng, Hao Yan, Tomonori Nakamura, Shun Omagari, Ji-Seon Kim, and Martin Vacha
ACS Nano
DOI: 10.1021/acsnano.0c08038
15 May 05:20
[ASAP] Deconvoluting Lipid Nanoparticle Structure for Messenger RNA Delivery
by Yulia Eygeris†, Siddharth Patel†, Antony Jozic†, and Gaurav Sahay*†‡
Nano Letters
DOI: 10.1021/acs.nanolett.0c01386
18 Oct 07:36
Crystallization Control of Organic Semiconductors during Meniscus‐Guided Coating by Blending with Polymer Binder
by Ke Zhang,
Tomasz Marszalek,
Philipp Wucher,
Zuyuan Wang,
Lothar Veith,
Hao Lu,
Hans‐Joachim Räder,
Pierre M. Beaujuge,
Paul W. M. Blom,
Wojciech Pisula
Crystallization of small molecular organic semiconductors (OSCs) during meniscus‐guided coating is enhanced by blending with a minor amount of an insulating polymer binder. The polymer binder increases mass transport and forms a bottom layer reducing the nucleation barrier height for OSC crystallization. The aligned crystalline films with stratified OSC/polymer layers contribute to a high charge transport in field effect transistors.
Abstract
Small molecule organic semiconductors (OSCs) suffer from their uncontrolled nucleation and growth during solution processing limiting their functionality in electronic devices. In this work, a new method is presented based on dip‐coating a blend consisting of OSC and insulating polymer to control the crystallization of the active film for organic field‐effect transistors. A small fraction of amorphous poly(methyl methacrylate) (PMMA) efficiently improves the crystallization of dip‐coated small molecule OSCs, α,ω‐dihexylquaterthiophene (DH4T) and diketopyrrolopyrrole‐sexithiophene (DPP6T). The maximum charge carrier mobilities of dip‐coated OSC:PMMA films are significantly higher than drop‐cast blend ones and comparable with OSC single crystals. The high charge carrier mobility originates from a continuous alignment of the crystalline films and stratified OSC and PMMA layers. The improved crystallization is attributed to two mechanisms: first, the polymer binder leads to a viscosity gradient at the meniscus during dip‐coating, facilitating the draw of solute and thus mass transport. Second, the polymer binder solidifies at the bottom layer, reducing the nucleation barrier height of small molecule OSC. The findings demonstrate that a small fraction of a polymer binder during dip‐coating efficiently improves the crystallization as well as the electronic properties of small molecule OSC films.
以昇陳, Ma Lanchao likes this
29 Jul 07:17
Environment: A journey on plastic seas
by Richard Thompson
Environment: A journey on plastic seas
Nature 547, 7663 (2017). doi:10.1038/547278a
Author: Richard Thompson
Richard Thompson applauds a chronicle alerting the world to marine polymer pollution.
10 Nov 01:09
Strain-Compensated InGaAs Terahertz Quantum Cascade Lasers
by Keita Ohtani, Mattias Beck and Jérôme Faist
ACS Photonics
DOI: 10.1021/acsphotonics.6b00376
02 Sep 12:59
Light-Emitting Devices: Enhancing Optical Out-Coupling of Organic Light-Emitting Devices with Nanostructured Composite Electrodes Consisting of Indium Tin Oxide Nanomesh and Conducting Polymer (Adv. Mater. 33/2015)
by Chien-Yu Chen, Wei-Kai Lee, Yi-Jiun Chen, Chun-Yang Lu, Hoang Yan Lin, Chung-Chih Wu
Nanostructured transparent composite electrodes consisting of perforated high-index conducting metal oxides and low-index conducting polymers are developed by C.-C. Wu and co-workers on page 4883. They are useful for effectively enhancing the optical out-coupling of organic light-emitting devices (OLEDs), yielding a very high OLED external quantum efficiency of nearly 62% when combined with the external extraction scheme.
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