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Efficient Diketopyrrolopyrrole-Based Small-Molecule Bulk-Heterojunction Solar Cells with Different Electron-Donating End-Groups SCIE SCOPUS

Title
Efficient Diketopyrrolopyrrole-Based Small-Molecule Bulk-Heterojunction Solar Cells with Different Electron-Donating End-Groups
Authors
Kim, YJBack, JYKim, SOJeon, CWPark, CEKim, YH
Date Issued
2014-09
Publisher
WILEY-V C H VERLAG GMBH
Abstract
A series of small molecules that contained identical pi-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.
Keywords
absorption; alkynes; conjugation; cross-coupling; solar cells; HIGH FILL FACTORS; ORGANIC SEMICONDUCTORS; BENZODITHIOPHENE UNIT; CONJUGATED POLYMERS; SIDE-CHAIN; PERFORMANCE; DESIGN; ENERGY; TRANSISTOR; SEPARATION
URI
https://oasis.postech.ac.kr/handle/2014.oak/14107
DOI
10.1002/ASIA.201402223
ISSN
1861-4728
Article Type
Article
Citation
CHEMISTRY-AN ASIAN JOURNAL, vol. 9, no. 9, page. 2505 - 2513, 2014-09
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박찬언PARK, CHAN EON
Dept. of Chemical Enginrg
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