Salatelli, E. and Marinelli, M. and Lanzi, M. and Zanelli, A. and Dell' Elce, S. and Liscio, A. and Gazzano, M. and Di Maria, F (2018) Bulk heterojunction solar cells: the role of alkyl side chain on nanoscale morphology of sulfur overrich regioregular polythiophenes/fullerene blends. The Journal of physical Chemistry C, 122.
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Bulk Heterojunction Solar Cells. The Role of Alkyl Side Chain on Nanoscale Morphology of Sulfur Overrich Regioregular Polythiophene-Fullerene Blends.pdf Download (1MB) | Preview |
Abstract
Regioregular HH-TT poly(3,3’-thioalkylbithiophene)s bearing branched or linear alkyl side-chain substituents (PT2SR) have been synthesized and characterized in order to investigate their behavior, when used as electron donor components in blend with a fullerene derivative (PCBM) as electron acceptor, in air-processed photovoltaic solar cells with bulk heterojunction architecture. The optoelectronic characteristics, energy gap, nanoscale morphology and crystallinity of the blends (PT2SR/PCBM) were examined by UV–vis spectroscopy, cyclic voltammetry, Kelvin Probe Force Microscopy and X-ray diffraction. We demonstrate that thioalkyl substituents are able to influence the PCBM self-assembly and the morphology of the polymeric film, important parameters to maximize the efficiency of solar cell. In particular, the presence of chemical branching in the side chain of the sulfur overrich polythiophene backbone favors the formation of PCBM clusters, of size about 100±30 nm as confirmed by X-ray diffraction and KPFM measurements, and facilitates the intermixing between the donor and acceptor materials at the nanoscale level, thus determining a corresponding increase in device performance.
| Item Type: | Article |
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| Subjects: | 600 Tecnologia - Scienze applicate |
| Depositing User: | Vincenzo Palermo |
| Date Deposited: | 08 Feb 2019 13:29 |
| Last Modified: | 08 Feb 2019 13:29 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18786 |
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