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Plasmonic ITO-free polymer solar cell

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Abstract

The aluminum and sliver multilayered nano-grating structure is fabricated by laser interference lithography and the intervals between nanoslits is filled with modified PEDOT:PSS. The grating structured transparent electrode functions as the anti-reflection layer which not only decreases the reflected light but also increases the absorption of the active layer. The performances of P3HT:PC61BM solar cells are studied experimentally and theoretically in detail. The field intensities of the transverse magnetic (TM) and transverse electrical (TE) waves distributed in the active layer are simulated by rigorous coupled wave analysis (RCWA). The power conversion efficiency of the plasmonic ITO-free polymer solar cell can reach 3.64% which is higher than ITO based polymer solar cell with efficiency of 3.45%.

© 2014 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1 (a) Schematic fabrication processes of nano-grating structure. (b) Schematic diagrams of the polymer solar cell structures on different transparent electrodes. Left is sample A, and right is sample B.
Fig. 2
Fig. 2 Scanning electron microscopy images of (a) nano-grating structure with a period of 500 nm and the line width of 200 nm on the glass substrate. (b) nano-grating structure whose slits are filled by PEDOT:PSS on the glass substrate. (c) atomic force microscopy (AFM) of (b). (d) SEM cross-sectional image of (b).
Fig. 3
Fig. 3 (a) The reflection spectra of the glass substrates coated with different transparent electrode layers. The (b) absorption spectra.
Fig. 4
Fig. 4 (a) The absorption spectra of the solar cells with different transparent electrode layers. The (b) EQE spectra, (c) The simulated results for the absorption spectra at different periods, and (d) J-V characteristics of samples A, B and C.
Fig. 5
Fig. 5 The field intensity distribution under TE and TM wave in samples (a) A, (b) B, and (c) C. (d) SEM cross- sectional image of Si/ PEDOT:PSS/P3HT:PCBM.

Tables (1)

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Table 1 The device performance of polymer solar cells with different transparent electrode layers.

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