Novel metallo-dendrimers containing various Ru core ligands and dendritic thiophene arms for photovoltaic applications
| Autor: | Mohan Ramesh, I. Hung Chiang, Harihara Padhy, Chih-Wei Chu, Hong-Cheu Lin, Kung-Hwa Wei, Rudrakanta Satapathy |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Polym. Chem.. 5:5423-5435 |
| ISSN: | 1759-9962 1759-9954 |
| DOI: | 10.1039/c4py00444b |
| Popis: | Three series of supramolecular mono-(i.e., Ru1G1, Ru1G2 and Ru1G3), bis-(i.e., BTRu2G1, BTRu2G2 and BTRu2G3) and tris-(i.e., TPARu3G1, TPARu3G2 and TPARu3G3) Ru-based dendritic complexes were synthesized. Their photophysical and electrochemical properties were investigated. These metallodendritic complexes covered a broad absorption range of 250–750 nm with optical bandgaps of 1.51– 1.86 eV. The energy levels of the metallo-dendrimers can be effectively adjusted not only by different generations of dendritic thiophene arms but also by their p-conjugated core ligands bearing various electron donor (i.e., triphenylamine) and acceptor (i.e., benzothiadiazole) moieties. Due to the donor– acceptor effect, the bis-Ru-based dendrimers containing a benzothiadiazole electron-acceptor core ligand showed the highest power conversion efficiency (PCE) among these three series of metallodendrimers. The tris-Ru-based architecture with a triphenylamine electron-donor core ligand revealed moderate photovoltaic performance. Among the different generations (G1–G3) of dendrimers, the third generation (G3) possessed the highest PCE values in each series of Ru-based dendrimers. Hence, the third generation bis-‘Ru’-based dendrimer BTRu2G3 blended with PC70BM (1 : 3 w/w) showed the highest PCE value of 0.77% (without the aid of additives or annealing), which is the highest efficiency among all bulk hetero-junction (BHJ) solar cells containing metallo-dendrimers reported to date. |
| Databáze: | OpenAIRE |
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