Construction and characterization of solar cells sensitized with quantum dots

In this research, the fabrication and characterization of solar cells sensitized with quantum dots using different cathodes including copper sulfide and lead sulfide and nanocomposite cathodes with successive coatings of these two materials are investigated. In this dissertation, we seek to optimize the photovoltaic characteristics of these cells. Due to the low functional factor in these cells and to investigate recombination factors according to the electrochemical impedance analysis of these cells, we seek to increase this characteristic by introducing effective cathodes. By using copper-sulfide and lead-sulfide composite structures that were layered by silar method, the efficiency of these cells has increased more than ۳times compared to cells whose cathode is copper sulfide or lead sulfide, ie %۳۶۶۳ vs. %۰ ۴and %۱/۴۸. Also, the functional factor in copper sulfide / lead sulfide nanocomposite cathodes has doubled, ie ۰۶۴۹vs. ۰۶۲۶. In addition, by examining the photovoltaic properties of solar cells, we analyze the function of the graphene cathode in these cells. In this research, graphene plates have been used due to their two-dimensional structure and high effective surface, as well as suitable electrical conductivity and its combination with copper sulfide / lead sulfide to increase the photovoltaic properties and efficiency of cells. Here, graphene has been used as a suitable substrate for copper sulfide and lead sulfide thinning in composite cathodes due to the large effective surface it provides, and has increased the efficiency from %۲۶۵۴to ۶ ۶%۳۶۲۱ .

کلیدواژه ها:

SOLAR CELL ، QUANTUM POINTS ، NANCOMPOSITE ، CYLAR ، GRAPHENE