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Photoluminescence Spectroscopy as a Tool for Quality Control of GaN Thin Film to Be Used in Solar Cell Devices

Materials Sciences and Applications 2014年第5期5卷 267-270页

作者： Guillermo Santana-Rodríguez Adolfo Mejía-Montero betsabeé marel monroy-peláez Máximo López-López Yenny Lucero Casallas-Moreno Manolo Ramírez-López Gerardo Contreras-Puente Osvaldo de Melo-Pereira Centro de Investigación y de Estudios Avanzados-IPN México City México Escuela Superior de Física y Matemáticas-Instituto Politécnico Nacional México City México Facultad de Física-Universidad de la Habana Habana City Cuba Instituto de Investigaciones en Materiales-Universidad Nacional Autónoma de México México City México Instituto de Investigaciones en Materiales-Universidad Nacional Autónoma de México México City México Centro de Investigación y de Estudios Avanzados-IPN México City México

The use of III-V and semiconductor nitrides in solar cells has been of interest in the PV-community due to the wide variation range of the band gap in these materials. Particularly, the processing of hetero-junction structures of InGaN/GaN and Si(p)/GaN(n) has been of great interest recently. In this work, the quality of GaN and InGaN thin films grown by Molecular Beam Epitaxy (MBE) on different substrate and buffer layers has been studied by photoluminescence spectroscopy (PL). The PL measurements were processed as function of sample temperature and pump power. In the PL spectra it is possible to observe a strong near band-gap-edge emission and a broad blue, green and yellow luminescence (BL, GL, YL), which can be assigned to the presence of Ga and N vacancies, amorphous phases, deep level impurities and structural defects. The relative intensity between the different peaks of the bands related to defects or impurities was studied as a tool for quality control of the films.

关键词： Photoluminescence Gallium Nitride Solar Cells

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Effect of Sleep Hygiene Orientation on Social Cognition Impairments Due to Chronic Sleep Restriction in Mexican Medical Residents

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Neuroscience & Medicine 2023年第3期14卷 47-62页

作者： Jiménez-Ceballos betsabe Arana-Lechuga Debora Yoaly Terán-Pérez Guadalupe Jovanna Escartín-Pérez Rodrigo Erick Velázquez-Moctezuma Javier Ciencias Biológicas y de la Salud Universidad Autónoma Metropolitana Ciudad de México México Sleep Disorders Center Universidad Autónoma Metropolitana Unidad Iztapalapa Ciudad de México México FES Iztacala Universidad Nacional Autónoma de México Ciudad de México México Neuroscience Area Universidad Autonoma Metropolitana Ciudad de México México

Introduction: Sleep is critical to human physiological function, cognitive performance, and emotional regulation. Healthcare personnel, especially physicians, are chronically exposed to long working hours, which are often accompanied by decreased sleep time. Clinical evidence indicates that these conditions affect their cognitive function and professional practice, but researchers in the field have not sufficiently explored the possible effects of reductions in sleep time on social cognition. Objective: The aim of this is to further explore the effects of sleep restriction among medical residents, the specific impairments in social cognition that it produces, and the effects of a sleep hygiene orientation on those impairments. Method: There were 124 medical residents (50 males, 74 females) who completed a daily sleep/work log, a battery of sleep tests/questionnaires, and neuropsychological evaluations. The participants then received a short course (8 hours) on basic concepts of sleep hygiene and sleep psychoeducation. Once the course was completed, participants filled out the questionnaires again. Results: The results indicate that sleep disturbances in medical residents were associated with severe neurocognitive and social cognition impairments. After the sleep hygiene intervention, neuropsychological function and sleep parameters improved, awareness increased, and social cognition performance significantly improved. Conclusion: Using sleep psychoeducation and sleep hygiene intervention in medical residents is a simple strategy to mitigate the effects of sleep restriction.

关键词： Sleep Hygiene Shift Work Sleep Restriction Cognitive Performance

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