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7,212 Newest Publications in nano letters

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Unique Optical Properties of Methylammonium Lead Iodide Nanocrystals Below the Bulk Tetragonal-Orthorhombic Phase Transition

12-Jan-2018 | Benjamin T. Diroll; Peijun Guo; Richard D. Schaller, Nano Letters, 2018

Methylammonium (MA) and formamidinium (FA) lead halides are widely studied for their potential as low-cost, high-performance optoelectronic materials. Here, we present measurements of visible and IR absorption, steady state, and time-resolved photoluminescence from 300 K to cryogenic ...

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Hybrid Lithographic and DNA-Directed Assembly of a Configurable Plasmonic Metamaterial That Exhibits Electromagnetically Induced Transparency

11-Jan-2018 | David B. Litt; Matthew R. Jones; Mario Hentschel; Ying Wang; Sui Yang; Hyun Dong Ha; Xiang Zhang; A. Paul Alivisatos, Nano Letters, 2018

Metamaterials are architectures that interact with light in novel ways by virtue of symmetry manipulation, and have opened a window into studying unprecedented light-matter interactions. However, they are commonly fabricated via lithographic methods, are usually static structures, and are limited ...

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Ultrafast Imaging of Carrier Cooling in Metal Halide Perovskite Thin Films

11-Jan-2018 | Sanghee Nah; Boris M. Spokoyny; Chan M. M. Soe; Constantinos C. Stoumpos; Mercouri G. Kanatzidis; Elad Harel, Nano Letters, 2018

Understanding carrier relaxation in lead halide perovskites at the nanoscale is critical for advancing their device physics. Here, we directly image carrier cooling in polycrystalline CH3NH3PbI3 films with nanometer spatial resolution. We observe that upon photon absorption, highly energetic ...

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High-Performance Photodetectors Based on Solution-Processed Epitaxial Grown Hybrid Halide Perovskites

11-Jan-2018 | Li Ji; Hsien-Yi Hsu; Jack C. Lee; Allen J. Bard; Edward T. Yu, Nano Letters, 2018

Hybrid organic–inorganic halide perovskites (HOIPs) have recently attracted tremendous attention because of their excellent semiconducting and optoelectronic properties, which exist despite their morphology and crystallinity being far inferior to those of more mature semiconductors, such as ...

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An Experimental Approach to Systematically Probe Charge Inversion in Nanofluidic Channels

11-Jan-2018 | Kuang-Hua Chou; Christopher McCallum; Dirk Gillespie; Sumita Pennathur, Nano Letters, 2018

Charge inversion of the surfaces of nanofluidic channels occurs in systems with high-surface charge and/or highly charged ions and is of particular interest because of applications in biological and energy conversion systems. However, the details of such charge inversion have not been clearly ...

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Spatial Control of Multiphoton Electron Excitations in InAs Nanowires by Varying Crystal Phase and Light Polarization

11-Jan-2018 | Erik Mårsell; Emil Boström; Anne Harth; Arthur Losquin; Chen Guo; Yu-Chen Cheng; Eleonora Lorek; Sebastian Lehmann; ..., Nano Letters, 2018

We demonstrate the control of multiphoton electron excitations in InAs nanowires (NWs) by altering the crystal structure and the light polarization. Using few-cycle, near-infrared laser pulses from an optical parametric chirped-pulse amplification system, we induce multiphoton electron ...

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Low Cost Metal Carbide Nanocrystals as Binding and Electrocatalytic Sites for High Performance Li–S Batteries

11-Jan-2018 | Fei Zhou; Zheng Li; Xuan Luo; Tong Wu; Bin Jiang; Lei-Lei Lu; Hong-Bin Yao; Markus Antonietti; Shu-Hong Yu, Nano Letters, 2018

Lithium sulfur (Li–S) batteries are considered as promising energy storage systems for the next generation of batteries due to their high theoretical energy densities and low cost. Much effort has been made to improve the practical energy densities and cycling stability of Li–S batteries via ...

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Control of Growth Front Evolution by Bi Additives during ZnAu Electrodeposition

11-Jan-2018 | Jeung Hun Park; Nicholas M. Schneider; Daniel A. Steingart; Hariklia Deligianni; Suneel Kodambaka; Frances M. Ross, Nano Letters, 2018

The performance of many electrochemical energy storage systems can be compromised by the formation of metal dendrites during charging. Additives in the electrolyte represent a useful strategy to mitigate dendrite formation, but understanding the mechanisms involved requires knowledge of the ...

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Nanometer Resolution Elemental Mapping in Graphene-Based TEM Liquid Cells

11-Jan-2018 | Daniel J. Kelly; Mingwei Zhou; Nick Clark; Matthew J. Hamer; Edward A. Lewis; Alexander M. Rakowski; Sarah J. Haigh; ..., Nano Letters, 2018

We demonstrate a new design of graphene liquid cell consisting of a thin lithographically patterned hexagonal boron nitride crystal encapsulated on both sides with graphene windows. The ultrathin window liquid cells produced have precisely controlled volumes and thicknesses and are robust to ...

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Tuning Single Quantum Dot Emission with a Micromirror

11-Jan-2018 | Gangcheng Yuan; Daniel Gómez; Nicholas Kirkwood; Paul Mulvaney, Nano Letters, 2018

The photoluminescence of single quantum dots fluctuates between bright (on) and dark (off) states, also termed fluorescence intermittency or blinking. This blinking limits the performance of quantum dot-based devices such as light-emitting diodes and solar cells. However, the origins of the ...

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