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CuInS2/PEDOT Photovoltaic Structure

Published online by Cambridge University Press:  15 February 2011

Sergei Bereznev ,
Igor Konovalov ,
Julia Kois ,
Enn Mellikov  and
Andres Öpik
Sergei Bereznev*
Affiliation:
Tallinn Technical University, Department of Material Science, Ehitajate tee 5, 19086 Tallinn, Estonia. Phone +372 6202820, Fax +372 6202798, E-mail:bereznev@edu.ttu.ee
Igor Konovalov
Affiliation:
Universität Leipzig, Wilhelm Ostwald Institute for Physical and Theoretical Chemistry, Linnéstr. 2, 04103 Leipzig, Germany
Julia Kois
Affiliation:
Tallinn Technical University, Department of Material Science, Ehitajate tee 5, 19086 Tallinn, Estonia. Phone +372 6202820, Fax +372 6202798, E-mail:bereznev@edu.ttu.ee
Enn Mellikov
Affiliation:
Tallinn Technical University, Department of Material Science, Ehitajate tee 5, 19086 Tallinn, Estonia. Phone +372 6202820, Fax +372 6202798, E-mail:bereznev@edu.ttu.ee
Andres Öpik
Affiliation:
Tallinn Technical University, Department of Material Science, Ehitajate tee 5, 19086 Tallinn, Estonia. Phone +372 6202820, Fax +372 6202798, E-mail:bereznev@edu.ttu.ee
*
*Corresponding author
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Abstract

Structures based on combination of electrically conductive polymers with inorganic semiconductors are currently intensively investigated with the aim to prepare low-cost, largearea and flexible photovoltaic devices. In this study, multilayer structures consisting of CuInS2 (CIS) and poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrenesulfonate (PSS) thin films were prepared and investigated for photovoltaic applications. Polycrystalline CIS absorber layers were synthesized on top of a layered structure on Cu tape substrate using socalled non-vacuum CISCuT technique. Thin PEDOT buffer layers doped with PSS were deposited onto KCN etched and vacuum annealed CIS films. The deposition was performed using the spin-casting technique from an aqueous dispersion of PEDOT/PSS mixed with Nmethylpyrrolidone, isopropanol, glycerin and epoxysilane additives. Optimal deposition parameters for stable PEDOT films with a good adherence to the surface of CIS were selected experimentally. The morphology and thickness of prepared films and structures was determined using SEM technique. Average film thickness was about of 1.5 μm for CIS and 50 nm for PEDOT films. Current-voltage and impedance characteristics were measured. Significant photovoltage and photocurrent of the photovoltaic structures were observed under standard illumination intensity. The best structure showed an open-circuit voltage of 510 mV and a shortcircuit current density of 20.2 mA/cm2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L7.17
Copyright
Copyright © Materials Research Society 2003

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