Absorption and quasiguided mode analysis of organic solar cells with photonic crystal photoactive layers
- Absorption and quasiguided mode analysis of organic solar cells with photonic crystal photoactive layers
- John R. Tumbleston; 고두현; Edward T. Samulski; Rene Lopez
- Issue Date
- Optics express
- VOL 17, NO 9, 7670-7681
- 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 ∼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 ∼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.
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