Journal
ENERGIES
Volume 15, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/en15031033
Keywords
organic solar cells; interdiffusion; solvent vapor annealing
Categories
Funding
- National Science Center [2013/11/B/ST5/04473]
- European Regional Development Fund in framework of Polish Innovation Economy Operational Program [POIG.02.01.00-12-023/08]
Ask authors/readers for more resources
The fabrication of bulk heterojunction organic solar cells relies on the phase separation during solution deposition. However, this study reveals that interdiffusion of the same molecules is possible when bilayers of donors and acceptors are exposed to solvent vapor, providing a new method for mixing incompatible components.
The fabrication of bulk heterojunction organic solar cells (OSCs) is primarily based on a phase demixing during solution deposition. This spontaneous process is triggered when, as a result of a decrease in the solvent concentration, interactions between donor and acceptor molecules begin to dominate. Herein, we present that interdiffusion of the same molecules is possible when a bilayers of donors and acceptors are exposed to solvent vapor. Poly(3-hexyl thiophene) (P3HT), and poly[N-9 '-heptadecanyl-2,7-carbazole-alt-5,5-(4 ',7 '-di-2-thienyl-2 ',1 ',3 '-benzothiadiazole) (PCDTBT) were used as donors and two types of fullerene derivatives were used as acceptors: phenyl-C61-butyric acid methyl ester (PC60BM) and phenyl-C71-butyric acid methyl ester (PC70BM), Secondary ion mass spectrometry depth profiling revealed that the interpenetration of donors and acceptors induced by solvent vapor annealing was dependent on solvent vapor and component compatibility. Exposure to chloroform vapor resulted in a complete intermixing of both components. The mutual mixing increased efficiency of inverted solar cells prepared by solvent vapor annealing of model donor/acceptor bilayers. These results provide a new means for mixing incompatible components for the fabrication of organic solar cells.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available