Espinet González, Pilar and Mohedano, Rubén and García Vara, Iván and Zamora Herranz, Pablo and Rey-Stolle Prado, Ignacio and Benitez Gimenez, Pablo and Algora del Valle, Carlos and Cvetkovic, Aleksandra and Hernández Sanz, Maikel and Chaves, Julio and Miñano Dominguez, Juan Carlos and Li, Yang
Triple-junction solar cell performance under Fresnel-based concentrators taking into account chromatic aberration and off-axis operation.
In: "8th International Conference on Concentrating Photovoltaic Systems", 16/04/2012 - 18/04/2012, Toledo, Spain. pp. 81-84.
Concentration photovoltaic (CPV) systems might produce quite uneven irradiance distributions (both on their level and on their spectral distribution) on the solar cell. This effect can be even more evident when the CPV system is slightly off-axis, since they are often designed to assure good uniformity only at normal incidence. The non-uniformities both in absolute irradiance and spectral content produced by the CPV systems, can originate electrical losses in multi-junction solar cells (MJSC). This works is focused on the integration of ray-tracing methods for simulating the irradiance and spectrum maps produced by different optic systems throughout the solar cell surface, with a 3D fully distributed circuit model which simulates the electrical behavior of a state-of-the-art triple-junction solar cell under the different light distributions obtained with ray-tracing. In this study four different CPV system (SILO, XTP, RTP, and FK) comprising Fresnel lenses concentrating sunlight onto the same solar cell are modeled when working on-axis and 0.6 degrees off-axis. In this study the impact of non-uniformities on a CPV system behavior is revealed. The FK outperforms other Fresnel-based CPV systems in both on-axis and off-axis conditions.