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RESEARCH FRONT
Contents Vol 69(7)

Stability of Polymer Interlayer Modified ITO Electrodes for Organic Solar Cells

Anirudh Sharma A , Zandra George B , Trystan Bennett C , David A. Lewis D , Gregory F. Metha C , Gunther G. Andersson D and Mats R. Andersson A E
+ Author Affiliations
- Author Affiliations

A Future Industries Institute, University of South Australia, Adelaide, SA 5095, Australia.

B Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Goteborg, Sweden.

C Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia.

D Flinders Centre for Nanoscale Science and Technology, Flinders University, Adelaide, SA 5042, Australia.

E Corresponding author. Email: Mats.Andersson@unisa.edu.au

Australian Journal of Chemistry 69(7) 735-740 https://doi.org/10.1071/CH15806
Submitted: 22 December 2015  Accepted: 17 February 2016   Published: 22 March 2016

Abstract

Indium-tin-oxide (ITO) electrode surfaces were modified using thin polymeric films of ethoxylated polyethylenimine (PEIE) and poly(3,3′-([(9′,9′-dioctyl-9H,9′H-[2,2′-bifluorene]-9,9-diyl)bis(4,1-phenylene)]bis(oxy))bis(N,N-dimethylpropan-1-amine)) (PFPA-1) to investigate the resultant work function and its stability in ambient atmosphere. Both PEIE and PFPA-1 were found to significantly reduce the ITO work function, as a result of a surface dipole at the ITO–polymer interface. After aging for two weeks in ambient air atmosphere, the N-side groups and OH groups in PEIE-modified ITO were found to realign themselves away from the polymer surface, resulting in an orientation more parallel to the surface normal and thus in an increase in work function from 3.5 to 3.8 eV. The work function of PFPA-1-modified ITO was found to increase from 3.65 to 4.1 eV after two weeks of aging in air due to a complete re-orientation of the polar side chains away from the surface, aligning the dipoles more parallel to the surface normal. In both PEIE and PFPA-1 samples, the hydrophobic aliphatic carbon was found to dominate the polymer surface, after aging.


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