Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
During the last years different optical designs of Dye Solar Cells (DSC) have been successfully employed to trap light in the active layer with the aim of improving power conversion efficiency. These approaches comprise from more standard ones based on the inclusion of diffuse scattering particles in different configurations[1] to recent ones in which photonic crystals.[2]
Here, 1D and 2D relief gratings are patterned onto the surface of nanocrystalline titania electrodes using a combined soft-lithography and microcontact printing approach.[3] This method gives rise to an increase in the photocurrent of the cell as a result of the angular diffraction of selected wavelengths.[4]
Since these transparent nanopatterned electrodes act as both reflection and transmission gratings, efficiency improvements are achieved when these photovoltaic devices are illuminated under any angle, comprising frontal and rear illumination.
The effect of these designs on the photovoltaic performance will be discussed, as well as the interplay with the semitransparency of the device, of interest for building integrated photovoltaics.
[1] Gálvez, F. E.; Kemppainen,E.; Míguez, H.; Halme, J. Effect of Diffuse Light Scattering Designs on the Efficiency of Dye Solar Cells: An Integral Optical and Electrical Description J. Phys. Chem., 2012, 116, 11426. [2] Colodrero, S.; Forneli, A.; López-López, C.; Pellejà, L.; Míguez, H.; Palomares, E. Efficient Transparent Thin Dye Solar Cells Based on Highly Porous 1D Photonic Crystals Adv. Funct. Mater. 2012, 22, 1303. [3] Quin, D.; Xia, Y.; Whitesides, G. M. Soft lithography for micro- and nanoscale patterning Nature Protocols, 2010, 5, 491. [4] López-López, C.; Colodrero, S.; Jiménez-Solano, A.; Ortiz, R.; Calvo, M. E.; Míguez, H. To be published.
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