Soluble Transition Metal Oxide/Polymeric Acid Composites for Efficient Hole-Transport Layers in Polymer Solar Cells

Title
Soluble Transition Metal Oxide/Polymeric Acid Composites for Efficient Hole-Transport Layers in Polymer Solar Cells
Authors
김정환Heejoo KimGeunjin KimHyungcheol BackKwanghee Lee
Issue Date
2014-01
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 6, NO 2-957
Abstract
We report a new method for developing a low-temperature solution processed vanadium oxide (s-VOx) and poly(4-styrene sulfonic acid) (PSS) composite to act as an efficient hole-transport layer (HTL) in polymer solar cells (PSCs). By compositing the s-VOx and PSS (s-VOx:PSS), the work function values of the s-VOx:PSS changed from 5.0 to 5.3 eV. Therefore, the energy level barrier between the HTL and organic active layer decreased, facilitating charge injection/extraction at the interfaces. In addition, the s-VOx:PSS films were denser and had more pin-hole-free surfaces than pristine s-VOx films, resulting in enhanced PSC performance due to significantly decreased leakage currents and excellent device stability in ambient condition. Because our approach of combining soluble transition metal oxide (TMO) and polymeric acid shows dramatically better performance than pristine TMO, we expect that it can provide useful guidelines for the synthesis and application of TMOs for organic electronics in the future.
URI
http://pubs.kist.re.kr/handle/201004/68203
ISSN
1944-8244
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KIST Publication > Article
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