Sustainable energy conversion & storage systems

Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices

Título : Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Autores: P. Ferrando-Villalba, Shunda Chen, A. F. Lopeandía, F. X. Alvarez, M. I. Alonso, M. Garriga, J. Santiso, G. Garcia, A. R. Goñi, D. Donadio*, and J. Rodríguez-Viejo*
Citation:
J. Phys. Chem. C 2020, 124, 36, 19864–19872
Publication Date:August 11, 2020
https://doi.org/10.1021/acs.jpcc.0c06410
PlumX: Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Superlattices with scattering mechanisms at multiple length scales efficiently scatter phonons at all relevant wavelengths and provide a convenient route to reduce thermal transport. Here, we show, both experimentally and by atomistic simulations, that SiGe superlattices with well-established compositional gradients and a sufficient number of interfaces exhibit extremely low thermal conductivity. 

Energy

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Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence

Autores: Aleksandr Perevedentsev*, Adrián Francisco-López, Xingyuan Shi, Andreas Braendle, Walter R. Caseri, Alejandro R. Goñi, and Mariano Campoy-Quiles
Citation:
Macromolecules 2020, 53, 17, 7519–7527
Publication DateAugust 26, 2020 
DOI: https://doi.org/10.1021/acs.macromol.0c01153
PlumX: Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence
The surprising optical properties of the non-π-conjugated polymer poly(phenylene methylene) (PPM) and its derivatives—that is, absorption in the 350–450 nm and photoluminescence (PL) in the 400–600 nm spectral regions—have been attributed to chromophores formed by homoconjugation along the polymer chain. The enabling role of homoconjugation, however, was hitherto ascertained primarily by excluding alternative origins of luminescence.

Energy

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Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures

Autores: Camilla Dore, Bernhard Dörling, Juan Luis Garcia‐Pomar, Mariano Campoy‐Quiles, Agustín Mihi
Citation: Small 2020, 2004795
 
PlumX: Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures
Transfer printing is one of the key nanofabrication techniques for the large‐scale manufacturing of complex device architectures. It provides a cost‐effective and high‐throughput route for the integration of independently processed materials into spatially tailored architectures.

Energy

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High‐Throughput Nanofabrication of Metasurfaces with Polarization‐Dependent Response

Metal nanostructures offer exciting ways to manage light at the nanoscale exploited in fields such as imaging, sensing, energy conversion, and information processing. The optical response of the metallic architectures can be engineered to exhibit photonic properties that span from plasmon resonances to more complex phenomena such as negative refractive index, optical chirality, artificial magnetism, and more.

Energy

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Electrodeposited Negative Index Metamaterials with Visible and Near Infrared Response

Negative index metamaterials have revolutionized the field of photonics because of their unconventional electromagnetic properties absent in naturally occurring materials. It remains a challenge however, to achieve strong negative refractive index at optical frequencies over large areas in a device compatible fashion.

Energy

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Towards photovoltaic windows: scalable fabrication of semitransparent modules based on non-fullerene acceptors via laser-patterning

Semitransparent organic photovoltaics (OPV) possess unique properties that make them highly appealing for their integration into semitransparent architectonic elements such as windows or glazings. In order to provide sufficient transparency, non-opaque electrodes and thin photoactive layers are typically used, thus limiting the light-harvesting capacity.

Energy

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Photoflexoelectric effect in halide perovskites

Harvesting environmental energy to generate electricity is a key scientific and technological endeavour of our time. Photovoltaic conversion and electromechanical transduction are two common energy-harvesting mechanisms based on, respectively, semiconducting junctions and piezoelectric insulators.

Energy

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Large area metasurfaces made with spherical silicon resonators

Pau Molet, Luz Karimé Gil-Herrera, Juan Luis Garcia-Pomar, Niccolò Caselli, Álvaro Blanco, Cefe López, Agustín Mihi. Nanophotonics. Received January 16, 2020; revised February 20, 2020; accepted February 22, 2020.

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Narrow linewidth quantum emitters in electron-beam shaped polymer

Carlotta Ciancico, Kevin Schädler, Sofia Pazzagli, Maja Colautti, Pietro Lombardi, Johann Osmond, Camilla Dore, Agustin Mihi, Anna Ovvyan, Wolfram HP Pernice, Enrico Berretti, Alessandro Lavacchi, Costanza Toninelli, Frank H.L. Koppens, Antoine Reserbat-Plantey. ACS Photonics

Energy

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Assembly-Induced Bright-Light Emission from Solution-Processed Platinum(II) Inorganic Polymers

Aleksandr Perevedentsev*, Fabio L. Bargardi*, Antoni Sánchez-Ferrer, Nathan J. Cheetham, Ahmad Sousaraei, Stephan Busato, Johannes Gierschner, Begoña Milián-MedinaBegoña Milián-Medina, Raffaele Mezzenga, Reinhold Wannemacher, Juan Cabanillas-Gonzalez, Mariano Campoy-Quiles and Walter R. Caseri.  ACS Omega20194610192-10204. Publication Date:June 12, 2019

Energy

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Thermoelectrics: From history, a window to the future

Davide Beretta, Neophytos Neophytou, James M.Hodges,  Mercouri G. Kanatzidis, DarioNarducci, Marisol Martin- Gonzalez, Matt Beekman, Benjamin Balke, Giacomo Cerretti, Wolfgang Tremel, Alexandra Zevalkink, Anna I. Hofmann,  Christian Müller, Bernhard Dörling, Mariano Campoy-Quiles, Mario Caironi. Materials Science and Engineering: R: Reports. 

Energy

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