Origin of Efficient Inverted Nonfullerene Organic
Solar Cells: Enhancement of Charge Extraction and Suppression of Bimolecular
Recombination Enabled by Augmented Internal Electric Field
Version 2 2017-10-31, 15:08
Version 1 2017-10-12, 20:52
Posted on 2017-10-31 - 15:08
We
report our effort to unravel the origin of efficient operation
of nonfullerene organic solar cells (OSCs), based on a poly[4,8-bis(5-(2-ethylhexyl)
thiophen-2-yl)benzo[1,2-b;4,5-b′]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)](PTB7-Th):3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno
[1,2-b:5,6-b′]dithiophene (ITIC) blend system. The effects
of buildup of space charges, charge extraction, and bimolecular recombination
processes on the performance and the stability of PTB7-Th:ITIC-based
regular and reverse configuration OSCs are analyzed. It is found that
the high-performing inverted PTB7-Th:ITIC OSCs benefit from the combined
effects of (1) suppression of bimolecular recombination enabled by
an augmented effective internal electric field and (2) improvement
of charge extraction by avoiding the holes passing through ITIC-rich
region, which would otherwise occur in a regular configuration cell.
The inverted PTB7-Th:ITIC OSCs possess a significant improvement in
the cell stability and a high power conversion efficiency of ∼8.0%,
which is >29% higher than that of an optimized regular configuration
control cell (6.1%).
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Wang, Yiwen; Wu, Bo; Wu, Zhenghui; Lan, Zhaojue; Li, Yongfang; Zhang, Maojie; et al. (2017). Origin of Efficient Inverted Nonfullerene Organic
Solar Cells: Enhancement of Charge Extraction and Suppression of Bimolecular
Recombination Enabled by Augmented Internal Electric Field. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.7b02308
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AUTHORS (7)
YW
Yiwen Wang
BW
Bo Wu
ZW
Zhenghui Wu
ZL
Zhaojue Lan
YL
Yongfang Li
MZ
Maojie Zhang
FZ
Furong Zhu