期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 33, 页码 18886-18895出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b04195
关键词
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资金
- Hong Kong Research Grant Council [612113]
- Innovation and Technology Commission [ITS/117/13]
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP)
- Research Grants Council Earmarked Research Grants (RGC-ERG) [M_CityU 102/12]
- Sharif University of Technology [G930305]
- Elite National Institute
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.
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