Solid-State and Flexible Dye-Sensitized TiO₂ Solar Cells:  a Study by Electrochemical Impedance Spectroscopy

Abstract

Dye-sensitized TiO 2 solar cells were assembled using rigid or flexible transparent electrodes (a conductive film deposited on glass or on poly(ethylene terephthalate) as substrates and a polymer electrolyte based on I 3 -/Iand poly(epichlorohydrin-co-ethylene oxide)). The cells were characterized by current-potential curves and electrochemical impedance spectroscopy under different light intensities. Under 100 mW cm -2 illumination, the rigid cell exhibited an open circuit potential V OC ) 0.82 V, a short-circuit photocurrent I SC ) 2.2 mA cm -2 , and an efficiency η ) 1%; for the flexible cell, V OC ) 0.72 V, I SC ) 0.40 mA cm -2 , and η ) 0.1%. Under illumination, impedance spectra of the cells exhibited three semicircles. 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.

Titanium Dioxide Nanomaterials: Basics and Design, Synthesis and Applications in Solar Energy Utilization Techniques

“…Deducing the exact mechanism through experimental and theoretical investigations is complicated, partly because of the apparent inability to systematically vary individual parameters without influencing others. Fortunately, there have been much experimental and theoretical evidence that supports the notion that the electron transport is governed by a trapping-detrapping process of electrons from the sub-bandgap states (Longo et al, 2002). In the DSC system, one dye molecule transfers one electron to Ti 4+ 3d 0 of TiO 2 , and then one Ti 3+ 3d 1 is generated.…”

Pore size dependence of self-assembled type photonic crystal on dye-sensitized solar cells efficiency utilising Chlorine e6

“…The resistance component of a DSSC consists of two or more factors such as an ITO substrate, dye, TiO 2 and an electrolyte solution. The various applications of electrochemical impedance measurements to DSSCs have been performed and there are also numerous reports of equivalent circuits for the separation of the resistive component [41][42][43]. In this experiment, we used the equivalent circuit reported by Eguchi et al [44], which enables each resistance component of DSSCs to be discussed in detail.…”

Review of Recent Progress in Dye-Sensitized Solar Cells

“…• C [20,21] and a compressing method [22,23] to achieve electrically connected TiO 2 network have been reported. Pichot et al [20] reported the preparation ).…”