Encontrados 23 documentos, a visualizar página 1 de 3
Dynamic behavior of resistive random access memories (RRAMS) based on plastic s...
Rocha, P. R. F.; Kiazadeh, A.; Chen, Q.; Gomes, Henrique L.Resistive Random Access Memories based on metal-oxide polymer diodes are characterized. The dynamic behavior is studied by recording current-voltage characteristics with varying voltage ramp speed. It is demonstrated that these organic memory devices have an internal capacitive double-layer structure, which inhibits the switching at high ramp rates (1000 V/s). This behavior is modeled and explained in terms of ...
Electroforming process in metal-oxide-polymer resistive switching memories
Chen, Q.; Gomes, Henrique L.; Kiazadeh, A.; Rocha, P. R. F.; De Leeuw, Dago M.; Meskers, S. C. J.Electroforming of an Al/Al2O3/polymer/Al esistive switching diode is reported. Electroforming is a dielectric soft-breakdown mechanism leading to hysteretic current–voltage characteristics and non–volatile memory behavior. Electron trapping occurs at early stages of electroforming. Trapping is physically located at the oxide/polymer interface. The detrapping kinetics is faster under reverse bias and for thicker...
New electronic memory device concepts based on metal oxide-polymer nanostructur...
Kiazadeh, A.; Rocha, P. R. F.; Chen, Q.; Gomes, Henrique L.Nanostructure silver oxide thin films diodes can exhibit resistive switching effects. After an electroforming process the device can be programmed between a low conductance (off-state) and high conductance (on- state) with a voltage pulse and they are already being considered for non-volatile memory applications. However, the origin of programmable resistivity changes in a network of nanostructure silver oxide ...
Aplicação da análise de componentes principais na cinemática da marcha de idosa...
Kirkwood,Renata N.; Resende,Renan A.; Magalhães,Cláudio M. B.; Gomes,Henrique A.; Mingoti,Sueli A.; Sampaio,Rosana F.CONTEXTUALIZAÇÃO: A aplicabilidade da análise de marcha foi aprimorada com a introdução da análise de componentes principais (ACP), uma técnica estatística que reduz o volume de dados, permitindo a comparação de todo o ciclo entre grupos de indivíduos. OBJETIVOS: Comparar, por meio da ACP, a cinemática da articulação do joelho durante a marcha nos planos sagital e frontal, entre mulheres idosas sem e com diagnó...
Planar non-volatile memory based on metal nanoparticles
Kiazadeh, A.; Gomes, Henrique L.; Costa, Ana M. Rosa da; Rocha, P. R. F.; Chen, Q.; Moreira, José A.; De Leeuw, Dago M.; Meskers, S. C. J.Resistive switching properties of silver nanoparticles hosted in an insulating polymer matrix (poly(N-vinyl-2-pyrrolidone) are reported. Planar devices structures using interdigitated gold electrodes were fabricated. These devices have on/off resistance ratio as high as 103 , retention times reaching to months and good endurance cycles. Temperature-dependent measurements show that the charge transport is weakly...
Opto-electronic characterization of electron traps upon forming polymer oxide m...
Chen, Q.; Bory, Benjamin F.; Kiazadeh, A.; Rocha, P. R. F.; Gomes, Henrique L.; Verbakel, F.; De Leeuw, Dago M.; Meskers, S. C. J.Metal-insulator-polymer diodes where the insulator is a thin oxide (Al2O3) layer are electroformed by applying a high bias. The initial stage is reversible and involves trapping of electrons near the oxide/polymer interface. The rate of charge trapping is limited by electron transport through the polymer. Detrapping of charge stored can be accomplished by illuminating with light under short-circuit conditions. ...
Doping distribution of an operating organic light-emitting diode: a raman map a...
Paez-Sierra, B. A.; Gomes, Henrique L.; Rangel-Kuoppa, V.T.We present confocal Raman spectroscopy (CSRS) maps of Poly(9,9-dioctylfluorene) (PFO)-based organic light emitting diode under operation. The CSRS analysis of the OLEDs was performed in normal room conditions. The non-emissive spots presented higher Raman intensity and broadening of the vibrational bands in comparison with the luminescent ones. The phenomenon is associated with an increase in the PFO - * absor...
Midiametria: Análise do desempenho de uma organização na mídia com metodologias...
Roberto Penteado; Ubiraci Gomes; Henrique Vilches; Robinson Cipriano; Wilson Fonseca Junior; Luc Quoniam; Eric Boutin; Edson RiccioEste trabalho é um exercício de união entre os campos da Ciência da Informação e da Ciência da Comunicação. Uma bem fundamentada e robusta metodologia de análise bibliométrica é utlizada para analisar os Meios de Comunicação de Massa, gerar tendências e determinar as preferências dos diversos ve&iacut...
Trapping of electrons in metal oxide-polymer memory diodes in the initial stage...
Bory, Benjamin F.; Meskers, S. C. J.; Janssen, R. A. J.; Gomes, Henrique L.; De Leeuw, Dago M.Metal oxide-polymer diodes require electroforming before they act as nonvolatile resistive switching memory diodes. Here we investigate the early stages of the electroforming process in Al/Al2O3 /polyspirofluorene /Ba/Al diodes using quasistatic capacitance-voltage measurements. In the initial stage, electrons are injected into the polymer and then deeply trapped near the polyspirofluorene-Al2O3 interface. For ...
Confocal scanning raman spectroscopy (CSRS) of an operating organic light-emitt...
Paez-Sierra, B. A.; Gomes, Henrique L.Organic molecules with semiconducting properties are becoming nowadays core of the organic-based electronic era. Although organic light emitting diodes (OLEDs) have already matured for commercial applications, they still require longer device lifetimes. Some of the long-standing challenges in OLED technology relay on degradation and failure mechanisms. Several authors observed that degradation and subsequent da...
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