Colloidal nanocomposite of reduced graphene oxide and quantum dots for enhanced surface passivation in optoelectronic applications

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Colloidal graphene/PbS quantum dots (QDs) hybrid nanostructures are fabricated with chemical grafting in one-pot solution methods. In the hybrid nanocomposites, PbS QDs are decorated on the reduced graphene oxide (rGO) nanosheets (NSs). By employing X-ray photoelectron spectroscopy (XPS) analysis, it is shown that the rGO NSs are bonded to PbS nanocrystals through oxygen functional groups, leading to improved surface passivation and electrical conductivity in the hybrids. The results obtained by the recordings of time-resolved photoluminescence spectra, field effect mobility, and photovoltaic performance revealed that rGO grafted to PbS QD composite structures provided better charge transport by 16 times compared to PbS alone, which is attributed to suppressed charge recombination and improved interfacial charge transport processes. Thus, the developed hybrid photoactive film enhanced open circuit current (J(sc)) and power conversion efficiency (PCE) by 12% and 14% correspondingly.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-01
Language
English
Article Type
Article
Keywords

PHOTOINDUCED CHARGE-TRANSFER; SOLAR-CELLS; FILMS; NANOPARTICLES; NI

Citation

SOLAR ENERGY MATERIALS AND SOLAR CELLS, v.144, pp.181 - 186

ISSN
0927-0248
DOI
10.1016/j.solmat.2015.09.001
URI
http://hdl.handle.net/10203/205488
Appears in Collection
MS-Journal Papers(저널논문)
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