پديد آورنده :
علايي، فاطمه
عنوان :
محاسبه ي تغييرات گاف انرژي سلول هاي خورشيدي بر مبناي نقطه ي كوانتومي نيتريد بور
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
نه،75ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
پيمان صاحب سرا
استاد مشاور :
فرهاد فضيله
توصيفگر ها :
نيتريد بور شش گوشي , گرافين , نظريه تابعي چگالي , برنامه ي كوانتوم اسپرسو
تاريخ نمايه سازي :
28/10/92
استاد داور :
مجتبي اعلائي، اسماعيل عبدالحسيني
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Calculation of solar cell energy gap changes based on boron nitride quantum dot Fatemeh Alaee f alaee@ph iut ac ir 7 22 2013 Department of Physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Sahebsara sahebsara@cc iut ac irAbstractOptoelectronic devices require materials with energy gap within a given range Quantumdots nanoparticles with unique optical characterization satisfy this by changing its en ergy gap to be within this range Graphene and boron nitride are both consider to use inphotovoltaic cells the last is the lightest compound of III V Like graphene Boron nitridehas Hexagonal sturucture but due to large energy gap it categorized as semiconductorunlike graphene which is conductor Many approaches have been proposed to improving properties of these two materials in cluding use of strains patterned defects reduction in dimension as nanoribbons externalsupper lattice potentials doping and applying external electric fields doping by othermaterials such as hydrogen Breaking the symmetry and doping graphene lattice withboron and nitrogen atoms which will make p type and n type semiconductors with replac ing boron and nitrogen atoms with carbon in its structure respectively leads to wideningthe gap at the Fermi level Also remarkable structures can be made by mixing of grapheneand boron nitride In this study changes in band gap by identifying a quantum dot andchanging its structure in boron nitride compounds were studied Calculations are doneby quantum espresso s PWscf It is based on density functional theory and consideringthe plane waves as basic wave functions in electron wave function expansion using ul tra soft pseudopotentials based on the generalized gradient approximation and the PBEexchange correlation function Keywords Solar Cell Quantum Dot h BN Graphene Density Functional Theory QuantumEspresso
استاد راهنما :
پيمان صاحب سرا
استاد مشاور :
فرهاد فضيله
استاد داور :
مجتبي اعلائي، اسماعيل عبدالحسيني
