Small-bandgap polymer solar cells with unprecedented short-circuit current density and high fill factor

Hyosung Choi; Seo-Jin Ko; Taehyo Kim; Pierre-Olivier Morin; Bright Walker; Byoung Hoon Lee; Mario Leclerc; Jin Young Kim; Alan J Heeger

doi:10.1002/adma.201501132

Small-bandgap polymer solar cells with unprecedented short-circuit current density and high fill factor

Adv Mater. 2015 Jun 3;27(21):3318-24. doi: 10.1002/adma.201501132. Epub 2015 Apr 21.

Authors

Hyosung Choi¹, Seo-Jin Ko², Taehyo Kim², Pierre-Olivier Morin³, Bright Walker², Byoung Hoon Lee⁴, Mario Leclerc³, Jin Young Kim², Alan J Heeger⁴

Affiliations

¹ Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul, 133-791, South Korea.
² School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 689-798, South Korea.
³ Department of Chemistry, Laval University, Quebec City, QC, G1V 0A6, Canada.
⁴ Center for Polymers and Organic Solids, University of California Santa Barbara (UCSB), Santa Barbara, CA, 93106, USA.

PMID: 25899940
DOI: 10.1002/adma.201501132

Abstract

Small-bandgap polymer solar cells (PSCs) with a thick bulk heterojunction film of 340 nm exhibit high power conversion efficiencies of 9.40% resulting from high short-circuit current density (JSC ) of 20.07 mA cm(-2) and fill factor of 0.70. This remarkable efficiency is attributed to maximized light absorption by the thick active layer and minimized recombination by the optimized lateral and vertical morphology through the processing additive.

Keywords: bulk heterojunction; polymer solar cells; processing additives; small bandgap; vertical morphology.