Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
To date, many different approaches have been proposed for improving both the optical and electrical organic solar cell device properties via different light-trapping mechanisms. Utilizing the plasmonic resonance effects of novel metal nanostructures, including localized surface plasmon resonances (LSRPs) and propagating surface plasmon resonances (SPRs), is one promising way for boosting the light harvesting in the organic solar cell active layer, and thus the power conversion efficiencies1, 2. In this work, we theoretically and experimentally investigate large-area periodic gold nano-triangle arrays in organic solar cells and demonstrate the use of such nanostructures to improve the light absorption in the active layers, and thereby also to increase the efficiency of resulting devices. The periodic gold nano-triangles are prepared from Langmuir-Blodgett films using a lithography method based on the self-assembly of polystyrene nano-spheres. We examine the plasmonic properties of differently sized triangularly shaped nanoparticles (55 nm to 228 nm) arranged in hexagonal arrays, made from a combined nano-sphere lithography and temperature processing approach. The absorption measurements indicate that the introduction of such nano-triangle arrays induces a light absorption enhancement in the organic solar cells. In order to optimize the nanostructure size, we performed a numerical study, based on finite-difference time-domain (FDTD) analysis, modeling the electromagnetic field distribution inside the targeted devices.Our study thus presents the light harvesting ability of periodic gold nano-triangles and the feasibility of integrating these inexpensive and easily scalable nanostructures into organic solar cells. The presented generic technique can easily be applied in various future optoelectronic devices and it is also compatible with up-scaling techniques.
[1] Karg, M., König, T. A. F., Retsch, M., Stelling, C., Reichstein, P. M., Honold, T., Thelakkat, M., and Fery, A., “Colloidal self-assembly concepts for light management in photovoltaics,” Materials Today, 18(4), 185-205 (2015).
[2] Wu, B., Oo, T. Z., Li, X., Liu, X., Wu, X., Yeow, E. K. L., Fan, H. J., Mathews, N., and Sum, T. C., “Efficiency Enhancement in Bulk-Heterojunction Solar Cells Integrated with Large-Area Ag Nanotriangle Arrays,” The Journal of Physical Chemistry C, 116(28), 14820-14825 (2012).
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