A High Surface Area Organic Solar Cell Prepared by Electrochemical Deposition

[+] Author and Article Information
Yishay Diamant, Arie Zaban

Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900, Israel

J. Sol. Energy Eng 126(3), 893-897 (Jul 19, 2004) (5 pages) doi:10.1115/1.1755243 History: Received August 01, 2003; Revised March 01, 2004; Online July 19, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Typical electrodeposition of (a) PPEI and (b) TiOPc on the nanoporous TiO2 electrode. The cathodic dissolution of the OSC during a potential scan is shown in black and the anodic deposition on the target electrode under constant potential is shown in gray. The two reduction peaks during the dissolution process are assigned to the formation of the radical anion and the dianion of the OSC.
Grahic Jump Location
Fluorescence spectra of the deposited PPEI measured from the glass support side. The PPEI fluorescence is quenched almost to background level in the presence of the TiOPc, indicating efficient exciton dissociation in the solar cell.
Grahic Jump Location
Schematic representation of the wet solar cell analogous to the solid cell. This cell was employed to examine the hole transport from the TiOPc to the back contact.
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IPCE spectrum of a wet cell containing a TiOPc coated nanoporous SnO2 electrode in contact with I/I3 redox electrolyte and a Pt counter electrode. The action spectrum resembles the absorbance spectrum of TiOPc, indicating its participation in the energy conversion process.
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i-V curve of the cell presented in Figure 7 (TiOPc coated nanoporous SnO2 electrode in contact with I/I3 redox electrolyte and a Pt counter electrode).
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Energetic diagram of organic solar cell operation. (a) exciton diffusion to the charge separating interface (b) reflection of the exciton from the TiO2/PPEI interface (c) charge separation at the PPEI/TiOPc interface (d) electron collection through the PPEI (e) electron transport at the TiO2/PPEI interface and (f ) hole collection through the TiOPc.
Grahic Jump Location
(a) Action spectrum of the high-surface-area TiO2/PPEI/TiOPc electrode in contact with a redox electrolyte mediator (I/I3) and (b) the absorption spectrum of the electrochemically deposited PPEI, which indicates the formation of a polycrystalline layer. The light harvesting and energy photogeneration of these cells extends throughout most of the visible spectrum.
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A schematic view of the high surface area, solid state organic solar cell. Both the PPEI and the TiOPc were deposited on the TiO2 by the new electrochemical deposition method.



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