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Comprehensively Characterized Solar Cells: Impact of Angular, Spectral, and Non-Linear Effects
T. Fey, I. Kröger, F. Witt, S. Winter
Performance, Simulation, Energy Rating, Characterisation, Characterization, Experimental Methods
Operation, Performance, Reliability and Sustainability of Photovoltaics
Subtopic: PV Cells and Modules
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 5DO.11.3
1711 - 1715
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-5DO.11.3
0,00 EUR
Document(s): paper


The prediction of the short-circuit current and hence the efficiency of solar cells is one of the main tasks for the energy rating (IEC 61853). For the complex simulation of the short-circuit current in the course of a day a comprehensive characterization of solar cells and a detailed knowledge about the spectral distribution of the natural sunlight are necessary. PTB recently developed a multi-functional laser-based Differential Spectral Responsivity (DSR)-facility for characterization and primary calibration of solar cells with lowest uncertainties. Furthermore PTB developed an outdoor facility for secondary calibration of solar cells and spectral irradiance measurements. We investigate the spectral responsivity, the linearity, the I-V-curves and the angular dependence of a reference solar cell using the multi-functional DSR-facility for several irradiance levels and temperatures. The obtained experimental results are combined with calculated solar spectra for a simulation of the short-circuit current and further the efficiency for a course of a day. These calculations are done for several orientations of the solar cell (roof: east, south, west and flat). The algorithm takes the orientations of the solar cells towards the sun and the spectral distribution (SMARTS, direct and diffuse light, including albedo) into account. For validation of these simulations we measured the short-circuit currents for the same orientations with the outdoor facility over a complete day. The results show a good agreement of the measurements and the simulations. This study demonstrates, that a realistic simulation of short-circuit current and hence the efficiency can be obtained for various kind of solar cells at any outdoor or indoor conditions, if typical properties of the solar cells (spectral responsivity, linearity, the I-V-curves, angular dependence) and the spectral distribution are known.