Morphology and Charge Transfer Dynamics of Water Based, Solution-Processable, Transparent and Flexible Graphene Oxide/PEDOT:PSS Nanocomposite as Electrodes for Photovoltaic Applications
Bruno Borges a, Soheila Holakoei b, Matheus Neves b, Luana Wouk b, Aldo Zarbin b, Lucimara Roman b, Maria Luiza Rocco a
a Instituto de Química da UFRJ
b UFPR - Universidade Federal do Paraná, Rua Centro Politécnico, Curitiba, Brazil
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Maria Luiza Rocco, presentation 097
Publication date: 20th April 2022

The conjugated polymer poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS) is certainly one of the main substitute material for indium tin oxide (ITO)-free organic photovoltaic devices. However, PEDOT:PSS films have conductivities two orders of magnitude lower than ITO due the presence of PSS, an insulator polymer added to provide water dispersion to PEDOT. To enhance the electrical performance of the films and overcome the insulator limitations, one promising approach is the use of graphene oxide (GO). The effects of GO:PEDOT:PSS nanocomposites with several PEDOT:PSS proportions were analyzed in regards to the composite molecular structure and ordering, charge transfer dynamics in the femtosecond range, electrical properties and morphology. Charge transfer times at sulfur 1s absorption edge were calculated by the core-hole clock method and the results demonstrate the faster electron delocalization process for the GO:PEDOT:PSS 5% nanocomposite with a value of 3.3 fs, which may be related to the higher homogeneity and ordering of this film, as probed by AFM, SEM, and NEXAFS [1]. Additionally, the effect of thermal treatment of the nanocomposites was also evaluated by surface- and bulk-sensitive NEXAFS, resonant Auger spectroscopy and X-ray photoelectron spectroscopy [2]. GO:PEDOT:PSS 5% offers the best synergetic effect among the blends, a result that is in complete agreement with the electrical measurements.


This research was partially supported by LNLS - National Synchrotron Light Laboratory, Brazil. This study was also supported by CNPq, CAPES, FAPERJ, CT-INFRA FINEP and INCT Nanocarbon.

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