Influence of the terminal donor on the performance of 4,8-dialkoxybenzo[1,2-b:4,5′]dithiophene based small molecules for efficient solution-processed organic solar cells
| Autor: | Sushil S. Bagde, Hanok Park, Soo-Hyoung Lee, S.-Y. Lee |
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| Rok vydání: | 2016 |
| Předmět: |
Organic solar cell
Chemistry Annealing (metallurgy) Energy conversion efficiency 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Small molecule Catalysis 0104 chemical sciences law.invention Solution processed Delocalized electron law Materials Chemistry Organic chemistry Molecule Crystallization 0210 nano-technology |
| Zdroj: | New Journal of Chemistry. 40:2063-2070 |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | Two π-conjugated small molecules, BDT(TTBT)2 and BDT(PTBT)2, based on benzodithiophene (BDT) and benzothiadiazole (BT) substituted with different terminal groups such as hexyl-bithiophene and hexylphenyl-thiophene are investigated for use in solution-processed organic solar cells (OSCs). Investigations into the molecules reveal that variation of the terminal groups not only influences the optical and electronic properties, but also affects the crystallization and morphology of the small molecules. The BDT(TTBT)2 device showed a power conversion efficiency (PCE) of 1.73% as a consequence of deep HOMO (Voc = 0.81 V), improved charge delocalization, and strong light absorption (Jsc = 4.75 mA cm−2) when mild annealing was used as a result of improved texture in morphology, while the BDT(PTBT)2 device rather showed a moderate PCE of 1.22% with a Jsc of 2.88 mA cm−2, a Voc of 0.81 V, and a FF of 0.52. |
| Databáze: | OpenAIRE |
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