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Donor End-Capped Hexafluorinated Oligomers for Organic Solar Cells with 9.3% Efficiency by Engineering the Position of π-Bridge and Sequence of Two-Step Annealing
- Source :
- Chemistry of Materials. 29:1036-1046
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- A pair of isomeric hexafluorinated oligomers (Th6FSe and Se6FTh), which are with the same aromatic compositions (difluorobenzothiadiazoles central core, IDT units, and donor end-capped groups), but differ in the π-bridge position (selenophene and thiophene), were designed and successfully synthesized. The potential of the resulted oligomers as donor materials for BHJ-OSCs was systematically investigated through optical absorption, AFM, TEM, GIXD, charge mobility measurement, and photovoltaic device fabrication. It was found that the π-bridge sequences in the resulted oligomers play a subtle but key role in device performances. Moreover, as a result of increase of crystalline content and desired phase separation after rapid SVA or combined TA and SVA treatment, the device performance of the resultant devices undergo significant enhancement. Notably, the Se6FTh devices showed a best PCE of ca. 9.3% with SVA+TA treatment, which is the highest PCE of BHJ-OSCs based on donor end-capped oligomers. These primary...
- Subjects :
- Fabrication
Materials science
Organic solar cell
Annealing (metallurgy)
Atomic force microscopy
General Chemical Engineering
Two step
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Crystallography
chemistry.chemical_compound
chemistry
Materials Chemistry
Thiophene
Organic chemistry
0210 nano-technology
Subjects
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 29
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........1222cb2c0d5653af17f1e83276b710cb