Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 134, Issue -, Pages 194-198Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2014.11.042
Keywords
Polymer bulk-heterojunction solar cell; Low band-gap; Inverted architecture; Non-chlorinated solvent
Funding
- European Union [309201]
- University of Rome Tor Vergata
- SEQUEL's project
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The use of environmental friendly solvents for the fabrication of solution processed organic photovoltaics is a key issue to scale up the technology. Nowadays however, toxic and harmful chlorinated solvents are largely used in polymer solar cell laboratory research. In this work we successfully reached high solubility and miscibility of the low band gap polymer Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2b:4,5-teldithiophene-2,6-diyl][3-fluoro-24(2-ethylhexyl)carbonyllthieno[3,4-blthiophenediy1]] (PBDTTT-E-F, commonly known as PTB7), blended with [6,61-Phenyl-C71-butyric acid methyl-ester ([70] PCBM fullerene derivative) in a non-chlorinated solvent (Dimethylbenzenes also known as Xylenes). We studied the solar cells realized depositing blend solutions based on various Xylenes (ortho, para and an isomeric mixture from technical grade) achieving high power conversion efficiencies up to 8.7%. (C) 2014 Elsevier B.V. All rights reserved.
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