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Organic solar cell with PC structure

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Organic solar cells (OSCs) have various advantages compared with conventional silicon based solar cells; for example, low cost and flexibility. However, it is necessary to improve the low conversion efficiency for many practical applications. There have been a number of recent studies to improve the conversion efficiency by increasing the light absorption with the help of nano-sized structures. One method is to use photonic crystal (PC) structures in the photoactive layer where the light absorption can be enhanced by trapping light as leaky modes within the PC structures. In this section, we show how to simulate the light absorption within the OSC with PC (PCOSC) using FDTD.

 

Solvers

FDTD

Associated files

solar_organic_2D.fsp

Related publications

1). John R. Tumbleston et al., "Electrophotonic enhancement of bulk heterojunction organic solar cells through photonic crystal photoactive layer." Appl. Phys. Lett. 94, 043305, 2009. See also http://research.physics.unc.edu/project/rln/.

2). John R. Tumbleston et al., "Absorption and quasiguided mode analysis of organic solar cells with photonic crystal photoactive layers," Optics Express 17, pp. 7670 - 7681, 2009. See also http://research.physics.unc.edu/project/rln/.

3). Doo-Hyun Ko et al., "Photonic Crystal Geometry for Organic Solar Cells," Nano lett. 9, pp. 2742 - 2746, 2009.

Fig.1 Organic solar cell with photonic crystal structure

Fig.1 Organic solar cell with photonic crystal structure

 

Fig.2 Screenshot of layout editor of organic solar cell in which 2D photonic crystal with hexagonal lattice is formed

Fig.2 Screenshot of layout editor of organic solar cell in which 2D photonic crystal with hexagonal lattice is formed

 

In this example, we consider an OSC in which the bulk heterojenction blend, poly-3-hexylthiophene/[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) are used as a photoactive layer. The OSC has a PC structure formed by the bulk heterojunction blend and nc-ZnO as shown in Figs.1 and 2. Due to the existence of waveguide anomalies caused by a resonant interaction of incoming light with a leaky (or a quasi-guided) mode of the PC waveguide, the light absorption can be enhanced compared with conventional flat solar cells.

 

 

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