9394

8676

كارشناسي ارشد

فيزيك- ماده چگال

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1393

هفت،65ص.: مصور،نمودار

ص.ع.به فارسي و انگليسي

فيزيك

ID8676

AbstractSolar cells with p i n structure whi can be found in the form of quantum well quantum dotand nanotubes have recently been in the center of scienti c consideration because they canenhance e ciency of the cell e main processes in a quantum well solar cell QWSC arerecombination and transport Resonant tunneling RT is the most important phenomenon intransport e cells are consisted from two main parts the leads in the sides and the centralpart that contain several atomic layers In this resear using non equilibrium green s func tion theory we focused on the study of RT in su a system To do this we use a single bandtight binding model e Hamiltonian is in terms of the kinetic energy the band structure andband o set parts and also the Hartree potential en using equation of motion in stationarystate the green s function can be obtained At the rst step we solve the Poisson s equationto calculate the potential at the layer L e local density of states LDOS and current den sity versus bias voltage are driven for a bulk sample en the same parameters for singleand double quantum well samples are calculated e results show LDOS is localized in aquantum well and current density in p i n system exhibits nonlinear behavior Adding sin gle quantum well in the intrinsic region a resonance in 0 11 volt is a ieved Furthermore inthe symmetrical double quantum well the rst resonance occurs in 0 019 volt and the secondthis in 0 059 volt Keywords Non equilibrium green s function p i n diode Tight binding model quantumwell

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فرهاد فضيله، اسماعيل عبدالحسيني