An organic surface modifier to produce a high work function transparent electrode for high performance polymer solar cells

Hyosung Choi; Hak-Beom Kim; Seo-Jin Ko; Jin Young Kim; Alan J Heeger

doi:10.1002/adma.201404172

An organic surface modifier to produce a high work function transparent electrode for high performance polymer solar cells

Adv Mater. 2015 Feb 4;27(5):892-6. doi: 10.1002/adma.201404172. Epub 2014 Dec 16.

Authors

Hyosung Choi¹, Hak-Beom Kim, Seo-Jin Ko, Jin Young Kim, Alan J Heeger

Affiliation

¹ Center for Polymers and Organic Solids, University of California Santa Barbara (UCSB), Santa Barbara, California, 93106, USA; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, South Korea.

PMID: 25515353
DOI: 10.1002/adma.201404172

Abstract

Modification of an ITO electrode with small-molecule organic surface modifier, 4-chloro-benzoic acid (CBA), via a simple spin-coating method produces a high-work-function electrode with high transparency and a hydrophobic surface. As an alternative to PEDOT:PSS, CBA modification achieves efficiency enhancement up to 8.5%, which is attributed to enhanced light absorption within the active layer and smooth hole transport from the active layer to the anode.

Keywords: high work function; hole transport layers; organic surface modifiers; polymer solar cells.