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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Quasi Core/Shell Lead Sulfide/Graphene Quantum Dots for Bulk Heterojunction Solar Cells
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Quasi Core/Shell Lead Sulfide/Graphene Quantum Dots for Bulk Heterojunction Solar Cells

机译：准异质结太阳能电池的准核/壳硫化铅/石墨烯量子点

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摘要

Hybrid nanostructures combining semiconductor quantum dots and graphene are attracting increasing attention because of their optoelectronic properties promising for photovoltaic applications. We present a hot-injection synthesis of a colloidal nanostructure which we define as quasi core/shell PbS/graphene quantum dots due to the incomplete passivation of PbS surfaces with an ultrathin layer of graphene. Simulation by density functional theory of a prototypical model of a nonstoichiometric Pb-rich core (400 atoms) coated by graphene (20 atoms for each graphene sheet) indicates the possibility of surface passivation of (111) planes of PbS with graphene resulting in a decrease in trap states and recombination sites. The graphene coating of the PbS quantum dots decreases the exciton lifetime up to 0.78 mu s as compared to 1.2 mu s for the oleic acid passivated PbS quantum dots due to the fast extraction of carriers. We have employed PbS/graphene as well as Cd-doped PbS/graphene quantum dots as active layers of bulk heterojunction solar cells, and we achieved solar power conversion efficiencies of 3.6 and 4.1%, respectively.
机译：结合了半导体量子点和石墨烯的混合纳米结构由于其光电子性能有望用于光伏应用而受到越来越多的关注。我们介绍了胶体纳米结构的热注射合成，由于PbS表面与石墨烯的超薄层不完全钝化，我们将其定义为准核/壳PbS /石墨烯量子点。通过密度泛函理论对由石墨烯包覆的非化学计量的富Pb核（400个原子）（每个石墨烯片20个原子）的原型模型的仿真表明，石墨烯对PbS的（111）平面进行表面钝化的可能性降低了在陷阱状态和重组位点。由于载体的快速提取，PbS量子点的石墨烯涂层将激子寿命降低至0.78μs，而油酸钝化的PbS量子点的激子寿命为1.2μs。我们已将PbS /石墨烯以及Cd掺杂的PbS /石墨烯量子点用作体异质结太阳能电池的有源层，并且太阳能转换效率分别达到3.6％和4.1％。

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