Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 214, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201600536
Keywords
domain sizes; Electrospray deposition; non-halogenated solvents; organic photovoltaic cells; PTB7:PC71BM; thin films
Funding
- JSPS KAKENHI project [26420267]
- Grants-in-Aid for Scientific Research [26420267] Funding Source: KAKEN
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Since a large amount of solvents are needed for roll-to-roll printing processes of organic photovoltaic cells, an environmentally friendly process for practical mass production systems is in high demand. In this research, a highly efficient organic photovoltaic cell was successfully demonstrated by the electrospray deposition method using a non-halogenated solvent, o-xylene. An addition of acetonitrile and 1,8-diiodooctane drastically reduced domain size of the organic active layer, resulting in improved device performance. In addition, the photoconversion efficiency was continuously increased with increasing the solvent evaporation time of a droplet deposited on a substrate, and the highest photoconversion efficiency of 5.6% was achieved by optimizing the solvent evaporation time. Current-density-voltage characteristics under irradiation with AM 1.5 light and corresponding AFM images of the active layers electrosprayed with and without the addition of 1,8-diiodooctane in o-xylene and acetonitrile.
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