نوع مقاله : مقاله پژوهشی کامل
نویسندگان
گروه فیزیک، دانشکده فیزیک، دانشگاه صنعتی اصفهان، اصفهان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The incorporation of quantum dots in solar cells primarily aims to enhance efficiency by broadening the light absorption spectrum. However, this optimization necessitates careful examination of how these dots influence electronic transport. In this research, we focused on lanthanum vanadium oxide (LVO) quantum dots, chosen for their energy band gap that aligns optimally with the Shockley - Queisser limit curve for solar - to - electrical energy conversion. The Green's function approach was employed to calculate electron transport through these quantum dots, positioned as the central component between two metal conductors. Lanthanum vanadium oxide, classified as a strongly correlated material and a Mott insulator, required the application of the Hubbard model in second quantization representation for accurate system description. The Green's function was derived using both the equation of motion method and Dyson's equation. Calculations encompassed electron transmission probabilities for configurations involving two and four quantum dots. Furthermore, a key finding revealed an inverse relationship between electron - electron interaction strength and electronic transport efficiency. As interactions intensified, a decrease in electronic transport was observed. For the material under study, the optimal value of the Hubbard quantity at which electronic transport and system efficiency have their maximum value was determined.
کلیدواژهها [English]
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