Nature Materials contents: July 2013 Volume 12 Number 7 pp 591-680

TABLE OF CONTENTS July 2013 Volume 12, Issue 7 Editorial Correspondence Research Highlights News and Views Letters Articles Advertisement See what you've been missing with NEW Agilent Cary 7000 UMS Agilent introduces a revolution in solid sample measurement - the Cary 7000 Universal Measurement Spectrophotometer (UMS). Watch video, view webinar, receive a FREE Information Kit and learn how the NEW Cary 7000 will advance your materials analysis. Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature Publishing Index 2012 Global  The Nature Publishing Index (NPI) ranks institutions and countries according to the number of primary research articles they publish in the Nature family of journals in a one-year period. The Nature Publishing Index 2012 Global supplement provides league tables and commentary based on articles published between 1 January 2012 and 31 December 2012.  Where does your institution rank?    Editorial Top Embracing the organics world   p591 doi:10.1038/nmat3707 Mature fabrication technologies and a healthy research and development environment promise a glowing future for organic semiconductors. Correspondence Top Measuring internal quantum efficiency to demonstrate hot exciton dissociation   p593 Ardalan Armin, Yuliang Zhang, Paul L. Burn, Paul Meredith and Almantas Pivrikas doi:10.1038/nmat3692 See also: Correspondence by Grancini et al. Measuring internal quantum efficiency to demonstrate hot exciton dissociation   p594 Markus Scharber doi:10.1038/nmat3690 See also: Correspondence by Grancini et al. Reply to 'Measuring internal quantum efficiency to demonstrate hot exciton dissociation'   pp594 - 595 G. Grancini, M. Binda, L. Criante, S. Perissinotto, M. Maiuri, D. Fazzi, A. Petrozza, H-J. Egelhaaf, D. Brida, G. Cerullo & G. Lanzani doi:10.1038/nmat3693 See also: Correspondence by Scharber | Correspondence by Armin et al. Research Highlights Top Straight backbone | All-in-one model for foams | Fuel for delivery | Snapped in the act | Diamond photonics News and Views Top Organic light-emitting diodes: Bright design   pp597 - 598 Chris Groves doi:10.1038/nmat3688 In all likelihood, cheap and bright white organic light-emitting diodes will someday light up our homes. Three-dimensional models can now simulate the dynamics of charges and excitons governing the operation of these light sources and predict their performance with molecular precision. See also: Article by Mesta et al. Organic semiconductors: Made to order   pp598 - 600 Antonio Facchetti doi:10.1038/nmat3686 Fabricating thin films of organic semiconductors that have molecular order across large areas has proved challenging. Now, three complementary approaches — molecular design, fluid-flow control and the use of nucleating agents — offer unprecedented opportunities for next-generation optoelectronic applications. See also: Article by Diao et al. | Letter by Treat et al. | Article by Kim et al. Superconductivity: Fewer atoms, more information   pp600 - 601 Sergey Borisenko doi:10.1038/nmat3683 A complete understanding of the mechanism underpinning high-temperature superconductivity is notoriously elusive. The growing body of evidence suggesting that monolayer iron selenide superconducts up to 65 K indicates it may become an ideal model system for testing theoretical ideas. See also: Letter by He et al. | Article by Tan et al. Material witness: Nano contraception   p602 Philip Ball doi:10.1038/nmat3701 Ferroelectric tunnel junctions: Beyond the barrier   pp602 - 604 E. Y. Tsymbal and A. Gruverman doi:10.1038/nmat3669 Employing a semiconducting electrode in a ferroelectric tunnel junction boosts the resistance switching effect. See also: Letter by Wen et al. Nature Materials JOBS of the week Permanent Researcher, Atomic Electronics Group, NIMS National Institute for Materials Science (NIMS) Mass Spectrometry Laboratory Manager Wroclaw Research Centre EIT+ Postdoctoral Fellow Paul Scherrer Institute (PSI) More Science jobs from Nature Materials EVENT Functional Polymeric Materials 10.02.13 Cancun, Mexico More science events from Letters Top Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films   pp605 - 610 Shaolong He, Junfeng He, Wenhao Zhang, Lin Zhao, Defa Liu, Xu Liu, Daixiang Mou, Yun-Bo Ou, Qing-Yan Wang, Zhi Li, Lili Wang, Yingying Peng, Yan Liu, Chaoyu Chen, Li Yu, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Xi Chen, Xucun Ma, Qikun Xue & X. J. Zhou doi:10.1038/nmat3648 The unconventional superconductivity associated with iron pnictide materials has been the subject of intense interest. Using an annealing procedure to control the charge-carrier concentration, the behaviour of an FeSe monolayer deposited on SrTiO3 is now investigated, and indications of superconductivity at temperatures up to 65 K observed. See also: Article by Tan et al. | News and Views by Borisenko Current-driven dynamics of chiral ferromagnetic domain walls   pp611 - 616 Satoru Emori, Uwe Bauer, Sung-Min Ahn, Eduardo Martinez and Geoffrey S. D. Beach doi:10.1038/nmat3675 Controlling the direction of propagation of domain walls in magnetic nanowires is essential for their use in proposed device applications. It is now shown that Dzyaloshinskii–Moriya interactions determine the chirality of domain walls in metallic ferromagnets placed between a heavy metal and an oxide, which in turn means the direction of propagation can be determined by choosing suitable material properties. Ferroelectric-field-effect-enhanced electroresistance in metal/ferroelectric/semiconductor tunnel junctions   pp617 - 621 Zheng Wen, Chen Li, Di Wu, Aidong Li and Naiben Ming doi:10.1038/nmat3649 A ferroelectric tunnelling heterostructure is presented in which both the height and the width of the tunnelling barrier can be electrically modulated, leading to a greatly enhanced tunnelling electroresistance. In Pt/BaTiO3/Nb:SrTiO3 heterostructures, an ON/OFF conductance ratio that is about an order of magnitude greater than those reported in normal ferroelectric tunnelling junctions, is demonstrated at room temperature. See also: News and Views by Tsymbal & Gruverman Solution-processed organic spin–charge converter   pp622 - 627 Kazuya Ando, Shun Watanabe, Sebastian Mooser, Eiji Saitoh and Henning Sirringhaus doi:10.1038/nmat3634 The conversion of a spin current into an electric signal is known as the inverse spin Hall effect, and is expected to enable the full potential of spintronic devices to be realized. Although the effect has been extensively studied in inorganic metals and semiconductors, it is now shown also to occur in a solution-processed organic polymer placed in proximity to a magnetic insulator. Microstructure formation in molecular and polymer semiconductors assisted by nucleation agents   pp628 - 633 Neil D. Treat, Jennifer A. Nekuda Malik, Obadiah Reid, Liyang Yu, Christopher G. Shuttle, Garry Rumbles, Craig J. Hawker, Michael L. Chabinyc, Paul Smith & Natalie Stingelin doi:10.1038/nmat3655 Difficulties in controlling the nucleation and growth of thin films of organic semiconductors have impaired progress in organic electronics. Now, efficient control of the crystallite nucleation and microstructure of a broad range of organic semiconductors without detriment to their electronic properties has been achieved through the addition of small quantities of additives—a widely used strategy in bulk polymer crystallization. See also: News and Views by Facchetti Articles Top Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films   pp634 - 640 Shiyong Tan, Yan Zhang, Miao Xia, Zirong Ye, Fei Chen, Xin Xie, Rui Peng, Difei Xu, Qin Fan, Haichao Xu, Juan Jiang, Tong Zhang, Xinchun Lai, Tao Xiang, Jiangping Hu, Binping Xie & Donglai Feng doi:10.1038/nmat3654 Iron pnictide superconductors represent a suggestive alternative to cuprate superconductors for achieving high transition temperatures. Using in situ angle-resolved photoemission spectroscopy, the electronic properties of FeSe are examined as a function of film thickness, providing valuable insights into the mechanism driving the superconductivity in this material. See also: Letter by He et al. | News and Views by Borisenko Crafting the magnonic and spintronic response of BiFeO3 films by epitaxial strain   pp641 - 646 D. Sando, A. Agbelele, D. Rahmedov, J. Liu, P. Rovillain, C. Toulouse, I. C. Infante, A. P. Pyatakov, S. Fusil, E. Jacquet, C. Carrétéro, C. Deranlot, S. Lisenkov, D. Wang, J–M. Le Breton, M. Cazayous, A. Sacuto, J. Juraszek, A. K. Zvezdin, L. Bellaiche, B. Dkhil, A. Barthélémy & M. Bibes doi:10.1038/nmat3629 The ferroelectric properties of BiFeO3 have been the subject of extensive study. Using a range of experimental tools and numerical modelling, it is now shown that its ferroic properties can also be manipulated by strain effects, giving rise to a variety of magnonic phenomena. Proton trapping in yttrium-doped barium zirconate    pp647 - 651 Yoshihiro Yamazaki, Frédéric Blanc, Yuji Okuyama, Lucienne Buannic, Juan C. Lucio-Vega, Clare P. Grey & Sossina M. Haile doi:10.1038/nmat3638 Although high proton conductivity and chemical stability in yttrium-doped barium zirconate are of interest for intermediate-temperature solid-oxide fuel cells, there are remaining issues regarding its defect chemistry and macroscopic proton-transport mechanism. Proton transport in this compound is shown to be limited by proton–dopant association, and the presence of two types of proton environment above room temperature are observed, reflecting differences in proton–dopant configurations. Molecular-scale simulation of electroluminescence in a multilayer white organic light-emitting diode   pp652 - 658 Murat Mesta, Marco Carvelli, Rein J. de Vries, Harm van Eersel, Jeroen J. M. van der Holst, Matthias Schober, Mauro Furno, Björn Lüssem, Karl Leo, Peter Loebl, Reinder Coehoorn & Peter A. Bobbert doi:10.1038/nmat3622 The variety of electronic processes occurring within an organic light-emitting diode (OLED) make the prediction of their emission characteristics problematic. It is now shown that all the relevant processes occurring in a stacked OLED can be modelled down to the molecular scale, in turn leading to accurate emission profiles. See also: News and Views by Groves A molecular design principle of lyotropic liquid-crystalline conjugated polymers with directed alignment capability for plastic electronics   pp659 - 664 Bong-Gi Kim, Eun Jeong Jeong, Jong Won Chung, Sungbaek Seo, Bonwon Koo & Jinsang Kim doi:10.1038/nmat3595 The molecular alignment and order of conjugated polymers within organic electronic devices is an important consideration for the enhancement of device performance. Now, some design rules are revealed that promote the directed alignment of the polymers and result in the fabrication of well-aligned films with highly anisotropic carrier mobilities. See also: News and Views by Facchetti Solution coating of large-area organic semiconductor thin films with aligned single-crystalline domains   pp665 - 671 Ying Diao, Benjamin C-K. Tee, Gaurav Giri, Jie Xu, Do Hwan Kim, Hector A. Becerril, Randall M. Stoltenberg, Tae Hoon Lee, Gi Xue, Stefan C. B. Mannsfeld & Zhenan Bao doi:10.1038/nmat3650 Solution printing of organic semiconductors could in principle be scaled to industrial needs, yet attaining aligned single-crystals directly with this method has been challenging. By using a micropillar-patterned printing blade designed to enhance the control of crystal nucleation and growth, thin films of macroscopic, highly aligned single crystals of organic semiconductors can now be fabricated. See also: News and Views by Facchetti A transparent organic transistor structure for bidirectional stimulation and recording of primary neurons   pp672 - 680 Valentina Benfenati, Stefano Toffanin, Simone Bonetti, Guido Turatti, Assunta Pistone, Michela Chiappalone, Anna Sagnella, Andrea Stefani, Gianluca Generali, Giampiero Ruani, Davide Saguatti, Roberto Zamboni & Michele Muccini doi:10.1038/nmat3630 A transparent organic field-effect transistor allows the stimulation and recording of the bioelectrical activity of primary neural cells. The cells grow, differentiate and function on the device, which then provides the electrical stimulation, and enables the recording of extracellular current and optical imaging of the modulation of neuronal membrane potential. Top Advertisement Nature proudly sponsors the Imagine Science Film Awards Where science meets cinema Submit your film and compete for the $2,500 Nature Scientific Merit Award and the $1,000 Nature Audience Award www.imaginesciencefilms.org/festival/submit-your-film     Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. For event advertising opportunities across the Nature Publishing Group portfolio please contact natureevents@nature.com More Nature Events

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