Journal article Open Access
Vallerotto, Guido; Victoria, Marta; Askins, Stephen; Herrero, Rebecca; Domínguez, César; Antón, Ignacio ; Sala, Gabriel
The paper presents a novel Fresnel lens for concentrator photovoltaic (CPV) technologies with reduced chromatic aberration that allows increasing the attainable concentration. Although achromatic doublets for CPV have previously been proposed, they were based on coupling two plastic materials but no practical fabrication procedure was described. Here we present for the first time a cost-effective manufacturing process consisting in laminating a high-dispersion plastic, a low-dispersion elastomer and a rigid glass substrate. Ray-tracing simulations showed a concentration factor three times higher than that attained by a classic Silicone On Glass (SOG) Fresnel lens while maintaining the same acceptance angle. Due to the cost-effective manufacturing process the significant performance increase due to the higher concentration could be attained at a cost comparable with the current manufacturing cost of a conventional SOG Fresnel lens. Even taking into account the small efficiency loss resulting from the more complex geometry (about 4%) we believe that this novel concept may introduce a disruptive change in optics for CPV.
1. M. A. Green, K. Emery, Y. Hishikawa, W. Warta, and E. D. Dunlop, “Solar cell efficiency tables (version 47),” Prog. Photovolt. Res. Appl. 24 (1), 3–11 (2016).
2. E. Lorenzo and G. Sala, “Hybrid silicone-glass Fresnel lens as concentrator for photovoltaic applications,” The Sun (Baltim., Md.), 536–539 (1979).
3. M. Victoria, “New concepts and techniques for the development of high-efficiency concentrating photovoltaic modules,” PhD, E.T.S.I. Telecomunicación (UPM) (2014).
4. M. Victoria, C. Domínguez, I. Antón, and G. Sala, “Comparative analysis of different secondary optical elements for aspheric primary lenses,” Opt. Express 17 (8), 6487–6492 (2009).
5. S. Askins, M. Victoria, R. Herrero, C. Domínguez, I. Antón, G. Sala, F. Dimroth, S. Kurtz, G. Sala, and A. W. Bett, “Effects of Temperature on Hybrid Lens Performance,” AIP Conf. Proc. 1407, 57–60 (2011).
6. F. Languy, K. Fleury, C. Lenaerts, J. Loicq, D. Regaert, T. Thibert, and S. Habraken, “Flat Fresnel doublets made of PMMA and PC: combining low cost production and very high concentration ratio for CPV,” Opt. Express 19 (S3 Suppl 3), A280–A294 (2011).
7. E. Hecht, Optics, 3rd ed. (Addison Wesley Longman, Inc., 1998).
8. “ASTM G173 standard tables for reference solar spectral irradiances
9. K. R. McIntosh, J. N. Cotsell, J. S. Cumpston, A. W. Norris, N. E. Powell, and B. M. Ketola, “An optical comparison of silicone and EVA encapsulants for conventional silicon PV modules: A ray-tracing study,” 34th IEEE Photovoltaic Specialists Conference (PVSC) (2009), pp. 544–549.
10. S. N. Kasarova, N. G. Sultanova, C. D. Ivanov, and I. D. Nikolov, “Analysis of the dispersion of optical plastic materials,” Opt. Mater. 29 (11), 1481–1490 (2007).
11. I. Antón, D. Pachón, and G. Sala, “Characterization of optical collectors for concentration photovoltaic applications,” Prog. Photovolt. Res. Appl. 11 (6), 387–405 (2003).
12. M. Victoria, S. Askins, R. Herrero, I. Antón, and G. Sala, “Assessment of the optical efficiency of a Primary Lens to be used in a CPV system,” Sol. Energy 134, 406–415 (2016).
13. M. Victoria, R. Herrero, C. Domínguez, I. Antón, S. Askins, and G. Sala, “Characterization of the spatial distribution of irradiance and spectrum in concentrating photovoltaic systems and their effect on multi‐junction solar cells,” Prog. Photovolt. Res. Appl. 21 (3), 308–318 (2013).
14. S. R. Kurtz and M. J. O’Neill, “Estimating and controlling chromatic aberration losses for two-junction, two-terminal devices in refractive concentrator systems,” in IEEE Photovoltaic Specialists Conference (PVSC) (1996), pp. 361–364.
15. V. D. Rumyantsev, N. Y. Davidyuk, E. A. Ionova, P. V. Pokrovskiy, N. A. Sadchikov, and V. M. Andreev, “Thermal Regimes of Fresnel Lenses and Cells in “All‐Glass” HCPV Modules,” AIP Conf. Proc. 1277, 89–92 (2010).
16. T. Hornung, A. Bachmaier, P. Nitz, and A. Gombert, “Temperature Dependent Measurement And Simulation Of Fresnel Lenses For Concentrating Photovoltaics, ” in (AIP Publishing, 2010), Vol. 1277, pp. 85–88.
17. T. Hornung, M. Steiner, and P. Nitz, “Estimation of the Influence of Fresnel Lens Temperature on Energy Generation of a Concentrator Photovoltaic System,” Sol. Energy Mater. Sol. Cells 99, 333–338 (2012).
18. T. Schult, M. Neubauer, Y. Bessler, P. Nitz, and A. Gombert, “Temperature Dependence of Fresnel Lenses for Concentrating Photovoltaics,” 2nd Int. Workshop Conc. Photovolt. Opt. Power (2009).
19. J. M. Cariou, J. Dugas, L. Martin, and P. Michel, “Refractive-index variations with temperature of PMMA and polycarbonate,” Appl. Opt. 25 (3), 334–336 (1986).