Журнал нано- та електронної фізики (Journal of nano- and electronic physics)
Permanent URI for this collectionhttps://devessuir.sumdu.edu.ua/handle/123456789/197
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Item DC, AC, and Transient Simulation Study of MEMS Cantilever(Sumy State University, 2019) Khot, S.S.; Patil, A.A.; Mokashi, V.N.; Waifalkar, P.P.; More, K.V.; Kamat, R.K.; Dongale, T.D.Робота присвячена дослідженню моделювання постійного, змінного та перехідного струмів кантілівера MEMS. У роботі моделюється прямокутна система відкритого типу. У даному випадку ми змінювали довжину кантілівера MEMS (платиновий електрод) і вивчали його вплив у наступних випадках: i) вплив напруги на ємність і положення променю (аналіз постійного струму), ii) положення променю у часовій області, ємність і напруга (аналіз змінного струму) та iii) положення променю у часовій області, ємність і напруга (аналіз перехідних процесів). Результати показали, що довжина активного електрода кантілівера MEMS значно впливає на продуктивність MEMS. Крім того, напруга на кантілівері MEMS лінійно зростає з часом і виявилося, що вона не залежить від довжини електрода і діелектричних матеріалів, які використовувалися в розглянутій системі.Item Simulation Study of Field-effect Transistor Based Cylindrical Silicon Nanowire Biosensor: Effect of Length and Radius of the Nanowire(Sumy State University, 2019) Pawar, A.V.; Kanapally, S.S..; Chougule, A.P.; Waifalkar, P.P.; More, K.V.; Kamat, R.K.; Dongale, T.D.In the present report, we have simulated the FET based silicon nanowire biosensor and studied the effect of nanowire length and radius on the different functional characteristics of the silicon nanowire biosensor. We have used BioSensorLab open source simulation tool for the present investigation. Particularly, we have studied the effect of nanowire length and radius on conductance modulation with respect to target molecule density, conductance modulation with respect to buffer ion concentration, nanowire surface potential with respect to pH, signal to noise ratio (SNR) with respect to receptor density, settling time with respect to analyte concentration and density of captured molecule with respect to detection time. We have taken into account the electrostatic interaction between receptor molecules and target biomolecules, which is based on the Diffusion-Capture model. The results suggested that the higher conductance modulation can be achieved at the higher target molecule density with a larger radius of the silicon nanowire. On the other hand, maximum conductance modulation is observed at the lower radius of the silicon nanowire with lower buffer ion concentration. The simulation results suggested that the surface potential of the nanowire tends to decrease as the pH increases for both cases (nanowire length and radius). No significant effect on the signal to noise ratio due to the change in the nanowire length and radius was observed. It is observed that the nanowire length does not affect the settling time; however, change in the nanowire radius shows the significant effect on the settling time. In the nutshell, the nanowire length and radius significantly affect the performance parameters of the FET based silicon nanowire biosensor.Item Shape Dependent Optical Properties of GaAs Quantum Dot: A Simulation Study(Sumy State University, 2019) Kadam, K.D.; Patil, S.L.; Patil, H.S.; Waifalkar, Р.Р.; More, K.V.; Kamat, R.K.; Dongale, T.D.The present paper deals with the simulation study of the GaAs quantum dot with different shapes such as cuboid, cylinder, dome, cone, and pyramid. We have simulated various structures and investigated the shape dependent optical properties using open source simulation tool available on the NanoHub platform. This simulation tool can simulate the simple as well as multilayer zero-dimensional structures by solving Schrödinger equations. The results suggested that the energy states vary according to the shape and higher energy states are observed for cone-shaped whereas, cuboid shape shows lower energy states for zero-dimensional structure. Furthermore, optical simulation study suggested that the cuboid and cylinder shapes show maximum absorption whereas, minimum absorption is observed for the dome-shape. The higher absorption is due to the higher surface area of cuboid and cylinder shape, whereas, the insufficient polarization angle of the incident light lowers the absorption for the dome shape structure. Furthermore, the absorption property is not significantly altered during different temperature environments. The integrated absorption results suggested that the cuboid and cylinder shapes have higher absorption whereas, minimum integrated absorption is observed for the cone and pyramid shape zero-dimensional structures. The present results pave the way towards optimization of various parameters of quantum dot for optoelectronic applications.