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Efficient diketopyrrolopyrrole-based small-molecule bulk-heterojunction solar cells with different electron-donating end-groups.

Authors :
Kim YJ
Back JY
Kim SO
Jeon CW
Park CE
Kim YH
Source :
Chemistry, an Asian journal [Chem Asian J] 2014 Sep; Vol. 9 (9), pp. 2505-13. Date of Electronic Publication: 2014 Jul 02.
Publication Year :
2014

Abstract

A series of small molecules that contained identical π-spacers (ethyne), a central diketopyrrolopyrrole (DPP) unit, and different aromatic electron-donating end-groups were synthesized and used in organic solar cells (OSCs) to study the effect of electron-donating groups on the device performance. The three compounds, DPP-A-Ph, DPP-A-Na, and DPP-A-An, possessed intense absorption bands that covered a wide range, from 350 to 750 nm, and relatively low HOMO energy levels, from -5.50 to -5.55 eV. DPP-A-An, which contained anthracene end-groups, demonstrated a stronger absorbance and a higher hole mobility than DPP-A-Ph, which contained phenyl groups, and DPP-A-Na, which contained naphthalene units. The power-conversion efficiencies (PCEs) of OSCs based on organic:PC71BM blends (1:1, w/w) with a processed DIO additive were 3.93% for DPP-A-An, 3.02% for DPP-Na, and 2.26% for DPP-A-Ph. These findings suggest that a DPP core that is functionalized with electron-donating capping groups constitutes a promising new class of solution-processable small molecules for OSC applications.<br /> (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Details

Language :
English
ISSN :
1861-471X
Volume :
9
Issue :
9
Database :
MEDLINE
Journal :
Chemistry, an Asian journal
Publication Type :
Academic Journal
Accession number :
24990349
Full Text :
https://doi.org/10.1002/asia.201402223