Journal
OPTICS EXPRESS
Volume 17, Issue 9, Pages 7670-7681Publisher
Optica Publishing Group
DOI: 10.1364/OE.17.007670
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Funding
- Army Research Office [W911NF-07-1-0539]
- NSF [CMS-0507151]
- NASA [NAG-1-2301]
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We analyze optical absorption enhancements and quasiguided mode properties of organic solar cells with highly ordered nanostructured photoactive layers comprised of the bulk heterojunction blend, poly-3-hexylthiophene/[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) and a low index of refraction conducting material (LICM). This photonic crystal geometry is capable of enhancing spectral absorption by similar to 17% in part due to the excitation of quasiguided modes near the band edge of P3HT:PCBM. A nanostructure thickness between 200 nm and 300 nm is determined to be optimal, while the LICM must have an index of refraction similar to 0.3 lower than P3HT: PCBM to produce absorption enhancements. Quasiguided modes that differ in lifetime by an order of magnitude are also identified and yield absorption that is concentrated in the P3HT: PCBM flash layer. (C) 2009 Optical Society of America
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