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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Morais, Andreia [1] ; Alves, Joao Paulo C. [1] ; Lima, Francisco Anderson S. [2] ; Lira-Cantu, Monica [2] ; Nogueira, Ana Flavia [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Autonomous Univ Barcelona, Catalan Inst Nanocience & Nanotechnol ICN2, E-0193 Barcelona - Spain
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF PHOTONICS FOR ENERGY; v. 5, MAR 12 2015.
Citações Web of Science: 15
Resumo

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)

Processo FAPESP: 10/18656-1 - Preparação e caracterização de compósitos de Nanopartículas de TiO2 e ZnO contendo materiais carbonáceos e sua aplicação em células solares
Beneficiário:Andreia de Morais
Linha de fomento: Bolsas no Brasil - Doutorado