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PublicaciónOptical characterization and bandgap engineering of flat and wrinkle-textured FA(0.83)Cs(0.17)Pb(l(1-x)Brx)(3) perovskite thin films(AIP Publishing LLC., 2018)The complex refractive indices of formamidinium cesium lead mixed-halide [FA0.83Cs0.17Pb(I1– xBrx)3] perovskite thin films of compositions ranging from x = 0 to 0.4, with both flat and wrinkle-textured surface topographies, are reported. The films are characterized using a combination of variable angle spectroscopic ellipsometry and spectral transmittance in the wavelength range of 190 nm to 850 nm. Optical constants, film thicknesses and roughness layers are obtained point-by-point by minimizing a global error function, without using optical dispersion models, and including topographical information supplied by a laser confocal microscope.
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PublicaciónCase Report: Possible Vertical Transmission of Bartonella bacilliformis in Peru(American Society of Tropical Medicine and Hygiene, 2015)A 22-day-old male was admitted with a 2-day history of irritability, dyspnea, jaundice, fever, and gastroin testinal bleeding. A thin blood smear was performed, which showed the presence of intraerythrocyte bacteria identified as Bartonella bacilliformis, and subsequently, the child was diagnosed with Carrion’s disease. The diagnosis was confirmed by specific polymerase chain reaction. The child was born in a non-endemic B. bacilliformis area and had not traveled to such an area before hospitalization. However, the mother was from an endemic B. bacilliformis area, and posterior physical examination showed the presence of a wart compatible with B. bacilliformis in semi-immune subjects.These data support vertical transmission of B. bacilliformis.
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PublicaciónPassivation of Liquid-Phase Crystallized Silicon With PECVD-SiNx and PECVD-SiNx/SiOx(Wiley, 2018)Silicon nitride (SiNx) and silicon oxide (SiOx) grown with plasma-enhanced chemical vapor deposition are used to passivate the front-side of liquid-phase crystallized silicon (LPC-Si). The dielectric layer/LPC-Si interface is smooth and layers are well-defined as demonstrated with transmission electron microscopy. Using electron energy loss spectroscopy a thin silicon oxynitride is detected which is related to oxidation of the SiNx prior to the silicon deposition. The interface defect state density (D-it) and the effective fixed charge density (Q(IL,eff)) are obtained from high-frequency capacitance-voltage measurements on developed metal-insulator-semiconductor structures based on SiOx/SiNx/LPC-Si and SiOx/SiNx/SiOx/LPC-Si sequences. Charge transfer across the SiNx/LPC-Si interface is observed which does not occur with the thin SiOx between SiNx and LPC-Si. The SiOx/SiNx/LPC-Si interface is characterized by Q(IL,eff)>10(12)cm(-2) and D-it,D-MG>10(12)eV(-1)cm(-2). With SiOx/SiNx/SiOx stack, both parameters are around one order of magnitude lower. Based on obtained Q(IL,eff) and D-it(E) and capture cross sections for electrons and holes of sigma(n)=10(-14)cms(-1) and sigma(p)=10(-16)cms(-1), respectively, a front-side surface recombination velocity in the range of 10cms(-1) at both interfaces is determined using the extended Shockley-Read-Hall recombination model. Results indicate that field-effect passivation is strong, especially with SiOx/SiNx stack.
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PublicaciónLower thermal tolerance in nocturnal than in diurnal ants: a challenge for nocturnal ectotherms facing global warming(Blackwell Publishing Ltd, 2018)This study explores differences in heat tolerance among diurnal and nocturnal ant species in four ecosystems in Mexico: tropical montane, tropical rainforest, subtropical dry forests, and high-elevation semi-desert.
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PublicaciónResolving a challenging supersymmetric low-scale seesaw scenario at the ILC(American Physical Society, 2021)We investigate a scenario inspired by natural supersymmetry, where neutrino data is explained within a low-scale seesaw scenario. For this the minimal supersymmetric Standard Model is extended by adding light right-handed neutrinos and their superpartners, the R-sneutrinos. Moreover, we consider the lightest neutralinos to be Higgsino-like. We first update a previous analysis and assess to which extent does existing LHC data constrain the allowed slepton masses. Here we find scenarios where sleptons with masses as low as 175 GeV are consistent with existing data. However, we also show that the upcoming run will either discover or rule out sleptons with masses of 300 GeV, even for these challenging scenarios. We then take a scenario which is on the borderline of observability of the upcoming LHC run assuming a luminosity of 300 fb-1. We demonstrate that a prospective international e+e- linear collider with a center of mass energy of 1 TeV will be able to discover sleptons in scenarios which are difficult for the LHC. Moreover, we also show that a measurement of the spectrum will be possible within 1-3 percent accuracy. © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.