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Issue 129, 2015
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Stability enhancement of organic photovoltaic devices utilizing partially reduced graphene oxide as the hole transport layer: nanoscale insight into structural/interfacial properties and aging effects

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Abstract

A powerful insight into the structural and interfacial properties of post-fabricated bulk heterojunction (BHJ) organic photovoltaic (OPV) devices is reported. The nanoscale local structure of integrated devices is revealed by combined X-ray diffraction (XRD) and fluorescence (XRF) investigations. A comparative study is performed on devices using graphene oxide (GO) as the hole transporting layer (HTL) and reference PEDOT:PSS (poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate)) devices. Spatially resolved simultaneous XRD/XRF measurements with nanometre resolution on pristine and aged states of the devices evidence the occurrence of morphological modifications in the poly(2,7-carbazole) derivative (PCDTBT):fullerene derivative (PC71BM) active layer, induced by thermal reduction and solar illumination. Additionally, the results indicate that OPV devices with partially reduced graphene oxide (pr-GO) used as the HTL, exhibit photovoltaic characteristics similar to the PEDOT:PSS based devices but with a significant durability enhancement. This is attributed to the protecting role of the pr-GO film against humidity and indium diffusion from the Indium Tin Oxide (ITO) anode into the photoactive layer. As a result, the devices fabricated with pr-GO-HTL retain approximately 65% of their initial power conversion efficiency over 20 hours, while the efficiency of the reference devices degrades to 45% of the initial value.

Graphical abstract: Stability enhancement of organic photovoltaic devices utilizing partially reduced graphene oxide as the hole transport layer: nanoscale insight into structural/interfacial properties and aging effects

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Publication details

The article was received on 13 Nov 2015, accepted on 08 Dec 2015 and first published on 10 Dec 2015


Article type: Paper
DOI: 10.1039/C5RA24010G
Citation: RSC Adv., 2015,5, 106930-106940
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    Stability enhancement of organic photovoltaic devices utilizing partially reduced graphene oxide as the hole transport layer: nanoscale insight into structural/interfacial properties and aging effects

    B. Paci, G. Kakavelakis, A. Generosi, V. Rossi Albertini, J. P. Wright, C. Ferrero, D. Konios, E. Stratakis and E. Kymakis, RSC Adv., 2015, 5, 106930
    DOI: 10.1039/C5RA24010G

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