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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhanced photovoltaic performance of inverted hybrid bulk-heterojunction solar cells using TiO2/reduced graphene oxide films as electron transport layers

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Morais, Andreia [1] ; Alves, Joao Paulo C. [1] ; Lima, Francisco Anderson S. [2] ; Lira-Cantu, Monica [2] ; Nogueira, Ana Flavia [1]
Total Authors: 5
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Autonomous Univ Barcelona, Catalan Inst Nanocience & Nanotechnol ICN2, E-0193 Barcelona - Spain
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 15

In this study, we investigated inverted hybrid bulk-heterojunction solar cells with the following configuration: fluorine-doped tin oxide (FTO) vertical bar TiO2/RGO vertical bar P3HT: PC61BM vertical bar V2O5 or PEDOT: PSS| Ag. The TiO2/GO dispersions were prepared by sol-gel method, employing titanium isopropoxide and graphene oxide (GO) as starting materials. The GO concentration was varied from 0.1 to 4.0 wt%. The corresponding dispersions were spin-coated onto FTO substrates and a thermal treatment was performed to remove organic materials and to reduce GO to reduced graphene oxide (RGO). The TiO2/RGO films were characterized by x-ray diffraction, Raman spectroscopy, and microscopy techniques. Atomic force microscopy (AFM) images showed that the addition of RGO significantly changes the morphology of the TiO2 films, with loss of uniformity and increase in surface roughness. Independent of the use of V2O5 or PEDOT: PSS films as the hole transport layer, the incorporation of 2.0 wt% of RGO into TiO2 films was the optimal concentration for the best organic photovoltaic performance. The solar cells based on TiO2/RGO (2.0 wt%) electrode exhibited a similar to 22.3% and similar to 28.9% short circuit current density (J(sc)) and a power conversion efficiency enhancement, respectively, if compared with the devices based on pure TiO2 films. Kelvin probe force microscopy images suggest that the incorporation of RGO into TiO2 films can promote the appearance of regions with different charge dissipation capacities. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) (AU)

FAPESP's process: 10/18656-1 - Preparation and characterization of TiO2 and ZnO nanoparticles composites containing carbonaceous materials and their application in solar cells
Grantee:Andreia de Morais
Support type: Scholarships in Brazil - Doctorate