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Boron dipyrromethene (BODIPY) with meso-perfluorinated alkyl substituents as near infrared donors in organic solar cells

Authors :
Frank Jaiser
Donato Spoltore
Zaifei Ma
Koen Vandewal
Johannes Benduhn
Olaf Zeika
Tian-Yi Li
Dieter Neher
Karl Leo
Yue Li
Source :
Journal of Materials Chemistry A. 6:18583-18591
Publication Year :
2018
Publisher :
Royal Society of Chemistry (RSC), 2018.

Abstract

Three furan-fused BODIPYs were synthesized with perfluorinated methyl, ethyl and n-propyl groups on the meso-carbon. They were obtained with high yields by reacting the furan-fused 2-carboxylpyrrole in corresponding perfluorinated acid and anhydride. With the increase in perfluorinated alkyl chain length, the molecular packing in the single crystal is influenced, showing increasing stacking distance and decreasing slope angle. All the BODIPYs were characterized as intense absorbers in near infrared region in solid state, peaking at similar to 800 nm with absorption coefficient of over 280 000 cm(-1). Facilitated by high thermal stability, the furan-fused BODIPYs were employed in vacuum-deposited organic solar cells as electron donors. All devices exhibit PCE over 6.0% with the EQE maximum reaching 70% at similar to 790 nm. The chemical modification of the BODIPY donors have certain influence on the active layer morphology, and the highest PCE of 6.4% was obtained with a notably high jsc of 13.6 mA cm(-2). Sensitive EQE and electroluminance studies indicated that the energy losses generated by the formation of a charge transfer state and the radiative recombination at the donor-acceptor interface were comparable in the range of 0.14-0.19 V, while non-radiative recombination energy loss of 0.38 V was the main energy loss route resulting in the moderate V-oc of 0.76 V.

Details

ISSN :
20507496 and 20507488
Volume :
6
Database :
OpenAIRE
Journal :
Journal of Materials Chemistry A
Accession number :
edsair.doi.dedup.....83dcece4428da16b29236be19e7f428c
Full Text :
https://doi.org/10.1039/c8ta06261g