Prof. Aramis Azuri Sánchez Juárez Profile

Prof. Aramis Azuri Sánchez Juárez

at Univ Tecnica Particular de Loja

Area of Expertise:

Organic Electronics , Wind Energy , Optimization

Websites:

Personal Website

Publications (9)

Proceedings Article | 1 August 2021 Presentation + Paper

Natural pigment sensor for solar ultraviolet radiation measurement

D. Castillo, A. Sánchez, J. González, C. Chamba, Vasudevan Lakshminarayanan

Proceedings Volume 11810, 118100E (2021) https://doi.org/10.1117/12.2597616

KEYWORDS: Ultraviolet radiation, Sensors, Prototyping, Luminescence, Solar radiation, Ultraviolet detectors, Ozone, Optical filters, Skin, Photoresistors, Optoelectronics, Organic optoelectronics, UV optical elements, Fluorescent materials, Fluorescent solar collectors

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Proceedings Article | 20 August 2020 Presentation + Paper

Assessment of mesial temporal sclerosis through MRI processing

D. Castillo , R. Samaniego, Y. Jiménez, A. Sánchez, J. Carrión, M. J. Rodríguez Álvarez

Proceedings Volume 11469, 114690W (2020) https://doi.org/10.1117/12.2569043

KEYWORDS: Magnetic resonance imaging, Brain, Neuroimaging, Feature extraction, Epilepsy, Algorithm development, Machine learning, Feature selection, Principal component analysis, Image segmentation, Volume segmentation, Neurological disorders

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Proceedings Article | 30 August 2019 Paper

Detection of heavy metals in hydric resources through the optical analysis of exposed flora

A. Sánchez Juárez, M. Herrera Valdiviezo, J. Carrión Mogrovejo, M. Villa Achupallas

Proceedings Volume 11099, 110990D (2019) https://doi.org/10.1117/12.2529857

KEYWORDS: Metals, Cadmium, Absorption, Water, UV-Vis spectroscopy, Transmittance, Light sources, Optical analysis, Mercury, Molecules

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Proceedings Article | 6 September 2017 Paper

Colors vision effect: learning and teaching strategies based on reading nature images

D. Castillo, Y. Jiménez, O. Vivanco, L. Cuenca, C. Granda, A. Sánchez

Proceedings Volume 10367, 103670H (2017) https://doi.org/10.1117/12.2274620

KEYWORDS: Optical properties, Psychology, Optics education

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Proceedings Article | 6 September 2017 Paper

Effects of color in the learning of science

A Sánchez Juárez, César Granda, D. Castillo, Johanna Jaramillo, Guissella Melgar

Proceedings Volume 10367, 103670C (2017) https://doi.org/10.1117/12.2274686

KEYWORDS: Environmental sensing, Physics, Mathematics, Visualization

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Proceedings Article | 26 September 2016 Paper

Twenty natural organic pigments for application in dye sensitized solar cells

D. Castillo , A. Sánchez Juárez, S. Espinosa Tapia, A. Guaman, D. Obregón Calderón

Proceedings Volume 9942, 99421B (2016) https://doi.org/10.1117/12.2238395

KEYWORDS: Titanium dioxide, Dye sensitized solar cells, Absorbance, Solar cells, Energy conversion efficiency, Absorption, Glasses, Electrodes, Energy efficiency, Spectrophotometry

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Proceedings Article | 23 September 2016 Paper

Study of natural organic dyes as active material for fabrication of organic light emitting diodes

A. Sánchez Juárez, D. Castillo , A. Guaman, S. Espinosa , D. Obregón

Proceedings Volume 9941, 99412E (2016) https://doi.org/10.1117/12.2238429

KEYWORDS: Organic light emitting diodes, Light emitting diodes, Sol-gels, Deposition processes, Skin, Manufacturing, Polymers, OLED lighting, Neodymium, Visible radiation

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Proceedings Article | 23 September 2010 Paper

Characterization of the ambipolar transport properties of polymer-based organic photoconductor by non-steady-state photo-EMF technique

A. Sanchez Juarez, K. Aleman, M. Espinosa, A. Kosarev, S. Mansurova, S. Koeber, K. Meerholz

Proceedings Volume 7750, 77501V (2010) https://doi.org/10.1117/12.873115

KEYWORDS: Photoresistors, Diffusion, Modulation, Polymers, Organic semiconductors, Electron transport, Solar cells, Organic light emitting diodes, Field effect transistors, Optoelectronic devices

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Proceedings Article | 23 September 2010 Paper

Influence of polymer:sensitizer ratio on photoelectric properties of organic composite photoconductor

K. Aleman, A. Sanchez Juarez, A. Kosarev, S. Mansurova, S. Koeber, K. Meerholz

Proceedings Volume 7750, 77501W (2010) https://doi.org/10.1117/12.876387

KEYWORDS: Polymers, Electrons, Modulation, Composites, Quantum efficiency, Photoresistors, Diffusion, Solar cells, Solids, Glasses

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The results on characterization of the main photoelectric properties of the polymer:fulleren based composite material by using the non-steady-state photo-electromotive force (p-EMF) and modulated photocurrent technique are presented. By measuring this current under different experimental conditions, important material photoelectric parameters such as drift L₀ and diffusion length L_D, photocarrier's lifetime τ ; quantum efficiency of charge generation φ can be determined. The 50% of the composite weight consists of a mixture of the hole-conducting polymer PF6:TPD (poly-hexyle-triophene:N,N'-bis(4-methylphenyl)-N,N'-bis-(phenyl)-benzidine) sensitized with the highly soluble C₆₀ derivative PCBM (phenyl-C61-butyric acid methyl ester) . Seven samples with varied polymer:sensitizer weight ratio (49:1wt.-%, 45:5wt.-%, 40:10wt.-%, 15:35wt.-%, 25:25wt.-%, 10:40wt.-%, 5:45wt.-%) where prepared. The remaining 50% were two azo-dyes 2,5-dimethyl-(4-p-nitrophenylazo)-anisole (DMNPAA) and 3- methoxy-(4-p-nitrophenylazo)-anisole (MNPAA) (25wt.-% each). Photoconductive composite film was sandwiched between two glass plates covered by transparent ITO electrodes. Two counter-propagating beams derived from a cw HeNe laser (λ = 633nm) intersected inside the detector creating an interference pattern. The output photo-EMF current (SEE MANUSCRIPT FOR EQUATION) was detected as a voltage drop by a lock-in amplifier. At polymer sensitizer ratio 25:25wt.-% the signal sign changes to the opposite revealing that the majority carriers at this and higher concentration of sensitizer are electrons. Our results show that the majority carrier's lifetime τ is only slightly affected by the variations of sensitizer concentration. Mobility-lifetime product μ_hτ_h of holes, on its turn decreases at the increasing sensitizer concentration, while μ_eτ_e of electrons keeps increasing. All this indicates that the carrier's mobility is strongly influenced by the changes on sensitizer concentrations.

Showing 5 of 9 publications

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