Observation of negative differential resistance and hysteretic effect on buriti oil:polystyrene organic devices

Abstract

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Theoretical investigation of carotenoid ultraviolet spectra

“…Polystyrene (PS) and poly(methyl)-methacrylate (PMMA) matrices were recently modified with buriti (Mauritia flexuosa L.) oil (rich in carotenoids) showing good thermal stability and mechanical properties [8,18]. Besides that, these materials exhibit photoluminescence in the visible region and also can absorb UV-vis radiation [8,19].…”

Modeling Negative Differential Resistance (NDR) Devices using Radial Basis Function Neural Networks

“…Figure. 3. Current-voltage characteristics of buriti oil single-layer device (2). The + symbols indicate the data points and the solid line is the neural network approximation.…”

“…After that, a bibliographic research was the second step in order to acquire different characteristics curves of RTDs, but always trying to find those ones that can operate at room temperature and have the smallest area -that way we can work with very low power. Five final curves were selected and, from them, the required data (2,7,13,14). Using the radial basis neural network in MATLAB, an approximation of each curve was made.…”

“…Firstly, in this process, the modeling implementation was tested using available data (2). The I-V data from a single layer device that has a negative differential resistance characteristic was chosen to validate the radial basis neural network modeling routine.…”

“…This feature has potential for implementing low power memories and logic circuits (2) and appears in devices such as resonant tunneling diodes (RTD). RTDs are two-terminal devices responsible for switching and data latching.…”