Ordering up better conductivity
(Source: ScienceNOW)
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Grocholski, B. Tags: Chemistry, Materials Science twis Source Type: news
Kinesin takes substeps
(Source: ScienceNOW)
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Jiang, D. Tags: Biochemistry, Materials Science twis Source Type: news
Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations
We report a -conjugation–induced extension of electronic states of A-site cations that affects perovskite frontier orbitals. The -conjugated pyrene-containing A-site cations electronically contribute to the surface band edges and influence the carrier dynamics, with a properly tailored intercalation distance between layers of the inorganic framework. The ethylammonium pyrene increased hole mobilities, improved power conversion efficiencies relative to that of a reference perovskite, and enhanced device stability. (Source: ScienceNOW)
Source: ScienceNOW - February 4, 2021 Category: Science Authors: Xue, J., Wang, R., Chen, X., Yao, C., Jin, X., Wang, K.-L., Huang, W., Huang, T., Zhao, Y., Zhai, Y., Meng, D., Tan, S., Liu, R., Wang, Z.-K., Zhu, C., Zhu, K., Beard, M. C., Yan, Y., Yang, Y. Tags: Materials Science reports Source Type: news
A-sites join the band edge
(Source: ScienceNOW)
Source: ScienceNOW - February 4, 2021 Category: Science Authors: Szuromi, P. Tags: Materials Science twis Source Type: news
Unipolar stroke, electroosmotic pump carbon nanotube yarn muscles
Success in making artificial muscles that are faster and more powerful and that provide larger strokes would expand their applications. Electrochemical carbon nanotube yarn muscles are of special interest because of their relatively high energy conversion efficiencies. However, they are bipolar, meaning that they do not monotonically expand or contract over the available potential range. This limits muscle stroke and work capacity. Here, we describe unipolar stroke carbon nanotube yarn muscles in which muscle stroke changes between extreme potentials are additive and muscle stroke substantially increases with increasing po...
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Chu, H., Hu, X., Wang, Z., Mu, J., Li, N., Zhou, X., Fang, S., Haines, C. S., Park, J. W., Qin, S., Yuan, N., Xu, J., Tawfick, S., Kim, H., Conlin, P., Cho, M., Cho, K., Oh, J., Nielsen, S., Alberto, K. A., Razal, J. M., Foroughi, J., Spinks, G. M., Kim, Tags: Materials Science reports Source Type: news
Pump it up
(Source: ScienceNOW)
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Lavine, M. S. Tags: Materials Science twis Source Type: news
Watching early stage nucleation
(Source: ScienceNOW)
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Lavine, M. S. Tags: Chemistry, Materials Science twis Source Type: news
Reversible disorder-order transitions in atomic crystal nucleation
Nucleation in atomic crystallization remains poorly understood, despite advances in classical nucleation theory. The nucleation process has been described to involve a nonclassical mechanism that includes a spontaneous transition from disordered to crystalline states, but a detailed understanding of dynamics requires further investigation. In situ electron microscopy of heterogeneous nucleation of individual gold nanocrystals with millisecond temporal resolution shows that the early stage of atomic crystallization proceeds through dynamic structural fluctuations between disordered and crystalline states, rather than throug...
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Jeon, S., Heo, T., Hwang, S.-Y., Ciston, J., Bustillo, K. C., Reed, B. W., Ham, J., Kang, S., Kim, S., Lim, J., Lim, K., Kim, J. S., Kang, M.-H., Bloom, R. S., Hong, S., Kim, K., Zettl, A., Kim, W. Y., Ercius, P., Park, J., Lee, W. C. Tags: Chemistry, Materials Science reports Source Type: news
New research project on sustainable electronics promises to reduce e-waste problem
(Aarhus University) A new research project aims to tackle the ever-growing problem of electronic waste by merging materials science and printed electronics technology and creating novel electronically functional materials that are completely biologically degradable. The project is headed by Assistant Professor Shweta Agarwala from Aarhus University, Denmark, who's just received a grant of EUR 810.000 from the Villum Foundation. (Source: EurekAlert! - Biology)
Source: EurekAlert! - Biology - January 25, 2021 Category: Biology Source Type: news
Snapshots of a light-triggered transition
(Source: ScienceNOW)
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Kogar, A. Tags: Materials Science, Physics perspective Source Type: news
Thermopower and harvesting heat
(Source: ScienceNOW)
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Shi, X., He, J. Tags: Materials Science, Physics perspective Source Type: news
Opening charge transport pathways
(Source: ScienceNOW)
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Szuromi, P. Tags: Engineering, Materials Science twis Source Type: news
Watching a phase transition unfold
(Source: ScienceNOW)
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Stajic, J. Tags: Materials Science, Physics twis Source Type: news
Ultrafast nanoimaging of the order parameter in a structural phase transition
Understanding microscopic processes in materials and devices that can be switched by light requires experimental access to dynamics on nanometer length and femtosecond time scales. Here, we introduce ultrafast dark-field electron microscopy to map the order parameter across a structural phase transition. We use ultrashort laser pulses to locally excite a 1T-TaS2 (1T-polytype of tantalum disulfide) thin film and image the transient state of the specimen by ultrashort electron pulses. A tailored dark-field aperture array allows us to track the evolution of charge-density wave domains in the material with simultaneous femtose...
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Danz, T., Domröse, T., Ropers, C. Tags: Materials Science, Physics reports Source Type: news
Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells
Polymer passivation layers can improve the open-circuit voltage of perovskite solar cells when inserted at the perovskite–charge transport layer interfaces. Unfortunately, many such layers are poor conductors, leading to a trade-off between passivation quality (voltage) and series resistance (fill factor, FF). Here, we introduce a nanopatterned electron transport layer that overcomes this trade-off by modifying the spatial distribution of the passivation layer to form nanoscale localized charge transport pathways through an otherwise passivated interface, thereby providing both effective passivation and excellent cha...
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Peng, J., Walter, D., Ren, Y., Tebyetekerwa, M., Wu, Y., Duong, T., Lin, Q., Li, J., Lu, T., Mahmud, M. A., Lem, O. L. C., Zhao, S., Liu, W., Liu, Y., Shen, H., Li, L., Kremer, F., Nguyen, H. T., Choi, D.-Y., Weber, K. J., Catchpole, K. R., White, T. P. Tags: Engineering, Materials Science reports Source Type: news
