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Your search keyword '"Ruani, Giampiero"' showing total 4 results
Start Over Author "Ruani, Giampiero" Journal international journal of photoenergy
4 results on '"Ruani, Giampiero"'

1. Improvement of Dye Solar Cell Efficiency by Photoanode Posttreatment

Author

Ivanovska, Tanja, Šaponjić, Zoran, Radoičić, Marija B., Ortolani, Luca, Morandi, Vittorio, Ruani, Giampiero, Ivanovska, Tanja, Šaponjić, Zoran, Radoičić, Marija B., Ortolani, Luca, Morandi, Vittorio, and Ruani, Giampiero

Abstract

The basic concept for efficiency improvement in dye-sensitized solar cells (DSSC) is limiting the electron-hole recombination. One way to approach the problem is to improve the photogenerated charge carriers lifetime and consequently reduce their recombination probability. We are reporting on a facile posttreatment of the mesoporous photoanode by using a colloidal solution of TiO2 nanoparticles. We have investigated the outcome of the different sintering temperature of the posttreated photoanodes on their morphology as well as on the conversion efficiency of the DSSC. The DSSCs composed of posttreated photoanodes at 450 degrees C showed an increase in J(SC) and consequently an increase in efficiency of 10%. Investigations were made to determine the electron recombination via the electrolyte by the OCVD technique. We found that the posttreatment has the effect of reducing the surface trap states and thus increases the electron lifetime, which is responsible for the increase of the overall cell efficiency.

Published
2014

4. Optimised In2S3 Thin Films Deposited by Spray Pyrolysis.

Author

Spasevska, Hristina, Kitts, Catherine C., Ancora, Cosimo, and Ruani, Giampiero

Subjects
INDIUM compounds, THIN films, ELECTROFORMING, PYROLYSIS, PHOTOVOLTAIC cells, DYE-sensitized solar cells, ATOMIC force microscopy, ANNEALING of metals, SURFACE roughness, TEMPERATURE effect
Abstract

Indium sulphide has been extensively investigated as a component for different kind of photovoltaic devices (organic-inorganic hybrid devices, all inorganic, dye sensitized cells). In this paper, we have optimised the growth conditions of indium sulphide thin films by means of a low cost, versatile deposition technique, like spray pyrolysis. The quality of the deposited films has been characterised bymicro-Raman, vis-UV spectroscopy, and atomic force microscopy. Substrate deposition temperature and different postdeposition annealing conditions have been investigated in order to obtain information about the quality of the obtained compound (which crystalline or amorphous phases are present) and the morphology of the deposited films. We have shown that the deposition temperature influences strongly the amount of amorphous phase and the roughness of the indium sulphide films. Optimised postdeposition annealing treatments can strongly improve the final amount of the beta phase almost independently from the percentage of the amorphous phase present in the as deposited films. [ABSTRACT FROM AUTHOR]

Published
2012
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