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Admittance spectroscopy of Cu2ZnSnS4 based thin film solar cells
Fernandes, P. A.; Sartori, A. F.; Salomé, P. M. P.; Malaquias, J.; Cunha, A. F. da; Graça, M. P. F.; González, J. C.In this report, we propose an AC response equivalent circuit model to describe the admittance measurements of Cu2ZnSnS4 thin film solar cell grown by sulphurization of stacked metallic precursors. This circuit describes the contact resistances, the back contact, and the heterojunction with two trap levels. The study of the back contact resistance allowed the estimation of a back contact barrier of 246 meV. The ...
Transesterification of vegetables oil in subcritical methanol conditions
Pardal, Ana Cristina; M. Encinar, J.; F. González, J.; Martínez, G.Comunicação apresentada na 18th European Biomass Conference and Exhibition, Lyon (França), Maio de 2010 ; In this study, transesterification of rapeseed oil using subcritical methanol and potassium hydroxide as catalyst was studied. The variables affecting the methyl ester yield during the transesterification reaction, such as the catalyst content, reaction temperature, reaction time and the molar ratio of alc...
Transesterification of vegetables oil in subcritical methanol conditions
Pardal, Ana Cristina; M. Encinar, J.; F. González, J.; Martínez, G.Comunicação apresentada na 18th European Biomass Conference and Exhibition, Lyon (França), Maio de 2010 ; In this study, transesterification of rapeseed oil using subcritical methanol and potassium hydroxide as catalyst was studied. The variables affecting the methyl ester yield during the transesterification reaction, such as the catalyst content, reaction temperature, reaction time and the molar ratio of alc...
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