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New Materials for Dye-sensitized Solar Cells

Grant number: 13/07396-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2013
Effective date (End): February 28, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Carlos Frederico de Oliveira Graeff
Grantee:Mirko Congiu
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
Associated research grant:08/57872-1 - National Institute for Materials Science in Nanotechnology, AP.TEM


This project consists in the production and study of the properties of new materials for the optimization of dye-sensitized solar cells (DSSC) based on nanostructured TiO2 films and dyes of the family of N3. The research will focus on the study and optimization of new counter-electrodes, based on CoS and CuS nanoparticles, which show great interest in the field of industrial research and development, their promising electrochemical characteristics and their low cost. Besides obtaining the nanoparticles of CuS and CoS by hydrothermal technique assisted by microwave, a great effort is made in order to obtain an optimal paste precursor for the deposition of films of CuS and CoS by the technique of screen-printing, compatible with modern industrial production lines. Besides the production of counter-electrode, and as a secondary objective, we will study alternative electrolytes based redox couple Co2 + / Co3 +, using ionic liquids. This line of research began at Chose (Center for Hybrid and Organic Solar Energy), a center for advanced research on solar energy, located in Rome, Italy, where the candidate was trained in manufacturing solar cells DSSC type. Structural characterization of nanoparticle films will be made through measurements of X-ray diffraction and scanning electron microscopy. Symmetric cells will be mounted to the electrical characterization by electrochemical impedance spectroscopy in order to study the efficiency of the new counter-electrodes and their compatibility with different electrolytes. The basic characterization of the cells themselves will be carried out by the photo-current measurements and measurements of current versus applied voltage in the dark and under simulated solar illumination.

Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CERRA, SARA; PICA, PARIDE; CONGIU, MIRKO; BORATTO, M. H.; GRAEFF, C. F. O.; FRATODDI, ILARIA. Gold nanoparticles functionalized with 4,4'-dithiobiphenyl blended with CuS in PMMA for switching memory devices. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v. 31, n. 15 JUN 2020. Web of Science Citations: 0.
CONGIU, M.; DECKER, F.; DINI, D.; GRAEFF, C. F. O. An open-source equipment for thin film fabrication by electrodeposition, dip coating, and SILAR. INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, v. 87, n. 9-12, p. 2901-2909, DEC 2016. Web of Science Citations: 0.
CONGIU, M.; NUNES-NETO, O.; DE MARCO, M. L.; DINI, D.; GRAEFF, C. F. O. Cu2-xS films as counter-electrodes for dye solar cells with ferrocene-based liquid electrolytes. Thin Solid Films, v. 612, p. 22-28, AUG 1 2016. Web of Science Citations: 14.
CONGIU, MIRKO; BONOMO, MATTEO; DE MARCO, MARIA LETIZIA; DOWLING, DENIS P.; DI CARLO, ALDO; DINI, DANILO; GRAEFF, CARLOS F. O. Cobalt Sulfide as Counter Electrode in p-Type Dye-Sensitized Solar Cells. CHEMISTRYSELECT, v. 1, n. 11, p. 2808-2815, JUL 16 2016. Web of Science Citations: 8.
CONGIU, MIRKO; LANUTI, ALESSANDRO; DI CARLO, ALDO; GRAEFF, CARLOS F. O. A novel and large area suitable water-based ink for the deposition of cobalt sulfide films for solar energy conversion with iodine-free electrolytes. Solar Energy, v. 122, p. 87-96, DEC 2015. Web of Science Citations: 8.
CONGIU, M.; ALBANO, L. G. S.; DECKER, F.; GRAEFF, C. F. O. Single precursor route to efficient cobalt sulphide counter electrodes for dye sensitized solar cells. Electrochimica Acta, v. 151, p. 517-524, JAN 1 2015. Web of Science Citations: 13.

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Filed patent(s) as a result of this research project

EQUIPAMENTO AUTOMÁTICO PARA DEPOSIÇÃO DE FILMES FINOS BR1020150274912 - Universidade Estadual Paulista (UNESP) . Mirko Congiu; Carlos Frederico De Oliveira Graeff - October 2015, 29

Solicitação em análise e dentro do prazo legal de sigilo previsto na legislação PCT/BR2016/050265 - Universidade Estadual Paulista (UNESP) . Solicitação em análise e dentro do prazo legal de sigilo previsto na legislação - October 2016, 21