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On the Cover
Articles
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more >Communication
Programmable Phototaxis of Metal–Phenolic Particle Microswimmers
- Gan Lin
- Joseph J. Richardson
- Heba Ahmed
- Quinn A. Besford
- Andrew J. Christofferson
- Sebastian Beyer
- Zhixing Lin
- Amgad R. Rezk
- Marco Savioli
- Jiajing Zhou
- Chris F. McConville
- Christina Cortez‐Jugo
- Leslie Y. Yeo
- Frank Caruso
-  26 February 2021
Abstract
Metal–organic microswimmers with precise light‐driven velocities are engineered with promise for robotics, drug delivery, and environmental applications. Various cargos with distinct spectral absorption profiles can be loaded into the microswimmers to tune the specific wavelengths of light that lead to motion under ultraviolet, blue, green, and orange light.
CommunicationReducing Energy Disorder of Hole Transport Layer by Charge Transfer Complex for High Performance p–i–n Perovskite Solar Cells
-  26 February 2021
Abstract
A charge‐transfer complex strategy to reduce the energy disorder of the organic semiconductor (OS) charge transport layers (CTLs) by doping a well‐designed OS (BDT‐Si) with electron‐acceptor features in a commercial hole‐transport material (PTAA) is proposed. As a result, the p–i–n planar perovskite solar cells with the optimized hole‐transport layer exhibit the best power conversion efficiency of 21.87%, and good operating stability at maximum power point under continuous illumination.
CommunicationA Flash‐Induced Robust Cu Electrode on Glass Substrates and Its Application for Thin‐Film μLEDs
- Jung Ho Shin
- Jung Hwan Park
- Jeongmin Seo
- Tae Hong Im
- Jong Chan Kim
- Han Eol Lee
- Do Hyun Kim
- Kie Young Woo
- Hu Young Jeong
- Yong‐Hoon Cho
- Taek‐Soo Kim
- Il‐Suk Kang
- Keon Jae Lee
-  26 February 2021
Abstract
Flash‐induced robust Cu on a glass substrate for inorganic‐based micro‐light‐emitting diodes (μLEDs) is developed by chemical/physical interlocking. The Cu2O layer at Cu/glass interface and Cu nano‐interlocking resolve the inherent lattice mismatch for strong electrode adhesion, resulting in high optical power (41 mW mm–2) of AlGaInP vertical thin‐film μLED and robust μLED operation under severe environmental stresses.
CommunicationTexture Formation in Polycrystalline Thin Films of All‐Inorganic Lead Halide Perovskite
- Julian A. Steele
- Eduardo Solano
- Handong Jin
- Vittal Prakasam
- Tom Braeckevelt
- Haifeng Yuan
- Zhenni Lin
- René de Kloe
- Qiong Wang
- Sven M. J. Rogge
- Veronique Van Speybroeck
- Dmitry Chernyshov
- Johan Hofkens
- Maarten B. J. Roeffaers
-  26 February 2021
Abstract
Polycrystalline all‐inorganic CsPbI3−xBrx perovskite exhibits pervasive texture expressions when solution processed into thin‐film optical devices. Synchrotron‐based large‐area X‐ray scattering techniques provide insights, which connect the final texture formation to the crystal symmetry of the halide perovskite, which can be tuned via halide mixing. Both I‐rich and Br‐rich materials each exhibit two different, energetically favored texture directions.
CommunicationMimicking Nature's Butterflies: Electrochromic Devices with Dual‐Sided Differential Colorations
- Jian Chen
- Zhen Wang
- Chenglong Liu
- Zhigang Chen
- Xueqing Tang
- Qi Wu
- Shu Zhang
- Ge Song
- Shan Cong
- Qin Chen
- Zhigang Zhao
-  26 February 2021
Abstract
The first Janus‐structured electrochromic devices are evolved from traditional electrochromic structures by inserting an optically thin (4–8 nm) metallic layer with complex refractive index. These unique differentially colored devices are used to mimick the butterfly Kallima inachus, which closely resembles a dry leaf when its wings are close and exhibits various bright colors when its wings are open.
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The following is a list of the most cited articles based on citations published in the last three years, according to CrossRef.
moreGraphene and Graphene Oxide: Synthesis, Properties, and Applications
-  3906-3924
-  29 June 2010
Abstract
The synthesis, properties, and applications of graphene and graphene oxide‐based materials are reviewed in this article. Graphene can be synthesized by chemical vapor deposition (e.g., on Cu, Figure a) and graphene oxide is a precursor for other graphene‐based materials (e.g., “paper”, Figure b). Graphene shows exceptional physical properties (e.g., high thermal conductivity, as measured by using the device in Figure c) and may be used in future high‐performance electronic devices (e.g., single electron transistor, Figure d), among other possible applications.
Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2
- Michael Naguib
- Murat Kurtoglu
- Volker Presser
- Jun Lu
- Junjie Niu
- Min Heon
- Lars Hultman
- Yury Gogotsi
- Michel W. Barsoum
-  4248-4253
-  22 August 2011
Abstract
2D Ti3C2 nanosheets, multilayer structures, and conical scrolls produced by room temperature exfoliation of Ti3AlC2 in HF are reported. Since Ti3AlC2 is a member of a 60+ group of layered ternary carbides and nitrides, this discovery opens a door to the synthesis of a large number of other 2D crystals.
25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials
-  992-1005
-  19 December 2013
Abstract
MXenes are a new family of two‐dimensional early transition metal carbides and carbonitrides produced by etching a metal layer from ternary layered carbides called MAX phases. This review describes the progress—both theoretical and experimental—in the synthesis, understanding of structure, measuring of properties, and development of applications of MXenes. In addition, future research directions and challenging open questions are discussed.
An Electron Acceptor Challenging Fullerenes for Efficient Polymer Solar Cells
-  1170-1174
-  7 January 2015
Abstract
A novel non‐fullerene electron acceptor (ITIC) that overcomes some of the shortcomings of fullerene acceptors, for example, weak absorption in the visible spectral region and limited energy‐level variability, is designed and synthesized. Fullerene‐free polymer solar cells (PSCs) based on the ITIC acceptor are demonstrated to exhibit power conversion efficiencies of up to 6.8%, a record for fullerene‐free PSCs.
Polymeric Photocatalysts Based on Graphitic Carbon Nitride
-  2150-2176
-  20 February 2015
Abstract
Polymeric g‐C3N4‐based photocatalysts are very attractive due to their unique electronic and physicochemical properties, which make them well suited for various applications, such as photocatalytic water splitting, CO2 reduction, pollutant degradation, organic syntheses, and bacterial disinfection. These unique properties can be achieved by optimized preparation, nanostructural design, and bandgap engineering of g‐C3N4, as well as by the construction of g‐C3N4‐based semiconductor heterojunctions.











