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Development of Non-acidic Poly(ethylene dioxythiophene):poly(styrene sulfonate) for Organic and Hybrid Photovoltaic Devices

Published online by Cambridge University Press:  21 November 2011

Yun-Ju Lee ,
Summer R. Ferreira ,
R. Guild Copeland ,
Diana L. Moore  and
Julia W. P. Hsu
Yun-Ju Lee
Affiliation:
Department of Materials Science and Engineering, University of Texas at Dallas, 800 W. Campbell Rd. RL10, Richardson, TX 75080 Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185
Summer R. Ferreira
Affiliation:
Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185
R. Guild Copeland
Affiliation:
Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185
Diana L. Moore
Affiliation:
Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185
Julia W. P. Hsu
Affiliation:
Department of Materials Science and Engineering, University of Texas at Dallas, 800 W. Campbell Rd. RL10, Richardson, TX 75080 Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185
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Abstract

We demonstrate improved compatibility of poly(ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) hole transport layer with acid-sensitive materials by addition of a simple base, NaOH or NH4OH, to the aqueous suspension to increase pH. Addition of NaOH to the acidic PEDOT:PSS allowed the deposition of PEDOT:PSS on top of an inverted poly(3-hexylthiophene):ZnO nanoparticle blend hybrid photovoltaic device, and improved device performance due to preservation of the ZnO electron acceptor. To quantitatively investigate the impact of base addition to hole transport layer properties and device performance, we deposited PEDOT:PSS with different pH values on inverted poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester bulk heterojunction devices. We find that NaOH modification results in a substantial work function decrease and series resistance increase. In contrast, the volatile NH4OH leaves PEDOT:PSS with minimal changes in film properties and device performance.

Keywords

photovoltaicthin filmelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1348: Symposium CC – Hybrid Interfaces and Devices , 2011 , mrss11-1348-cc04-09
Copyright
Copyright © Materials Research Society 2011

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