Abstract
Hybrid nanomaterials based on graphene and PbS quantum dots (QDs) have demonstrated promising applications in optoelectronics. However, the formation of high-quality large-area hybrid films remains technologically challenging. Here, we demonstrate that ligand-assisted self-organization of covalently bonded PbS QDs and reduced graphene oxide (rGO) can be utilized for the formation of highly uniform monolayers. After the post-deposition ligand exchange, these films demonstrated high conductivity and photoresponse. The obtained films demonstrate a remarkable improvement in morphology and charge transport compared to those obtained by the spin-coating method. It is expected that these materials might find a range of applications in photovoltaics and optoelectronics.
Highlights
Graphene and its derivatives possess excellent conductivity, optical transparency, flexibility and stability
Precursors PbO (99.999%), hexamethyldisilathiane (TMS), methylammonium iodide (MAI), mercaptopropionic acid (MPA), 1,2-ethanedithiol (EDT), tetrabutylammonium iodide (TBAI), dimethylformamide anhydrous (DMF) were all purchased from Sigma-Aldrich (Schnelldorf, Germany); acetonitrile was purchased from AppliChem (Darmstadt, Germany), octadecene (ODE) was obtained from Acros Organics (Fair Lawn, NJ, USA), oleic acid (OlAc) from Fisher Chemicals (Ward Hill, MA, USA), ethanol (EtOH), methanol (MeOH), and chloroform were purchased from Vekton (Saint Petersburg, Russia)
Transient PL measurements show that the PL lifetime of the quantum dots (QDs) in an LB ffiilm drastically decreases in comparison with MPTS-treated QDs, indicating a strong charge transfer from QDs to reduced graphene oxide (rGO) (Figure S3)
Summary
Graphene and its derivatives possess excellent conductivity, optical transparency, flexibility and stability. We have used the Langmuir–Blodgett technique to fabricate thin films of PbS QDs, attached to rGO by the MPTS linker (LB films) Using this approach, a one-step fabrication of large-area smooth films can be fabricated, the properties of which have been readily tuned by post-deposition ligand exchange using a range of ligands. A one-step fabrication of large-area smooth films can be fabricated, the properties of which have been readily tuned by post-deposition ligand exchange using a range of ligands These rGO–PbS films have been compared to the more regularly utilized spin-coating method, with this novel approach producing films that demonstrate a remarkable improvement in morphology and charge transport
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