Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 24, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4841475
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Funding
- Generalitat Valenciana [Prometeo/2009/058]
- Institute of Nanotechnologies for Clean Energies [ISIC/2012/008]
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Defect states influence the operation of organic solar cells altering transport, recombination, and energetic mechanisms. This work investigates how processing conditions induce morphology-related, electrically active defects in the donor polymer of bulk-heterojunction solar cells. Structural order is inferred from absorption and X-ray diffraction data, while defect density is determined from capacitance methods. A correlation is observed between the polymer nanocrystallite size, the defect concentration, and the output voltage. For the case of poly(3-hexylthiophene), processing that promote crystallinity is beneficial for the device performance as it decreases the defect density (energy disorder) that finally enlarges the maximum achievable open-circuit voltage. Defect states within the effective bandgap modulate the downshift of the hole Fermi level upon illumination that in turn establishes the achievable open-circuit voltage. (C) 2013 AIP Publishing LLC.
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