Journal article Open Access

Rheological and physical characterization of PEDOT: PSS/graphene oxide nanocomposites for perovskite solar cells

Giuri Antonella; Masi Sofia; Colella Silvia; Listorti Andrea; Rizzo Aurora; Kovtun Alessandro; Dell'Elce Simone; Liscio Andrea; Esposito Corcione Carola

In this work, the influence of graphene oxide (GO) doped Poly(3,4 ethylenedioxythiophene):poly
(styrenesulfonate)(PEDOT:PSS) thin nanocomposite on an indium–tin-oxide (ITO) anode, as hole
transport layer (HTL) in perovskite solar cells, was investigated. Different concentrations of GO were
added into the PEDOT:PSS in order to enhance its conductivity. In particular, the influence of GO
content on the rheological and thermal properties of Poly(3,4-
ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/GO nanocomposites was initially
examined. The GO filler was prepared by using modified Hummers method and dispersed into
PEDOT:PSS in different quantity (ranging from 0.05 to 0.25 %wt/wt). The obtained nanocomposite
solutions were analyzed by rheological characterizations in order to evaluate the influence of the GO
filler on the viscosity of the PEDOT:PSS matrix. The wettability of solutions was evaluated by
Contact Angle (CA) measurements. The quality of GO dispersion into the polymer matrix was studied
using Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thermal characterizations
(DSC and TGA) were, finally, applied on nanocomposite films in order to evaluate thermal stability
of the films as well as to indirectly comprehend the GO influence on PEDOT:PSS-water links.

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