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Proceedings Paper

Solid-state and flexible solar cells based on dye-sensitized TiO2: study by electrochemical impedance spectroscopy
Author(s): Claudia Longo; Flavia Nogueira; Hubert Cachet; Marco-Aurelio De Paoli
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Paper Abstract

Dye sensitized TiO2 solar cells were assembled using rigid or flexible transparent electrodes (a conductive film deposited on glass or poly(ethylene terephthalate) as substrates and a polymer electrolyte based on (formula available in paper) and poly(epichlorohydrin-co-ethylene oxide). The cells were characterized by current-potential curves and electrochemical impedance spectroscopy under different light intensities. Under 100 mWcm-2 illumination, the rigid cell exhibited an open circuit potential VOC=0.75V, a short-circuit photocurrent ISC=2.5 mAcm-2 and an efficiency (eta) =0.9%; for the flexible cell, VOC=0.83V and (eta) and ISC were almost 10 times smaller. Under illumination, impedance spectra exhibited three semi-circles for the rigid cell. For the flexible cell the time constants were not well defined. In the dark, both systems presented very high impedance. The differences in the efficiency and the impedance spectra of both cells were compared and discussed.

Paper Details

Date Published: 21 February 2002
PDF: 10 pages
Proc. SPIE 4465, Organic Photovoltaics II, (21 February 2002); doi: 10.1117/12.456936
Show Author Affiliations
Claudia Longo, Univ. Estadual de Campinas (Brazil)
Flavia Nogueira, Univ. Estadual de Campinas (Brazil)
Hubert Cachet, Lab. de Physique des Liquides et Electrochimie (France)
Marco-Aurelio De Paoli, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 4465:
Organic Photovoltaics II
Zakya H. Kafafi; Denis Fichou, Editor(s)

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