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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Averaging the unaverageable: Defining a meaningful local series resistance for large-area silicon solar cells
摘要： From its definition based on lateral voltage drops, the local series resistance isn’t an arithmetically averageable quantity because voltage isn’t extensive; however, only such quantities can be averaged. Still, empirically it was found that averaging series images arithmetically provides rather reasonable results. Since the emitter of a large-area silicon solar cell is nearly an equipotential layer, one can linearize the description of the lateral voltage distribution (with respect to the forward-bias current and the emitter resistivity), from which we obtain an averageable local series resistance for the H-type grid geometry; its averageability stems from averaging the parallel paths of vertical current flow. By construction, the average obtained from this linear response theory is identical to the lumped value coming from the illumination intensity variation method, and it also shows the experimentally observed dependency on the forward-bias diode current.
关键词： local series resistance,linear response theory,arithmetic averaging,illumination intensity variation method,silicon solar cells
更新于2025-09-16 10:30:52
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Fundamental Aspects Concerning the Validity of the Standard Equivalent Circuit for Large‐Area Silicon Solar Cells
摘要： The standard equivalent circuit of a solar cell amounts to a lumped description by separate diode and resistor elements. Since its application to a large-area silicon solar cell effectively implies averaging the emitter resistance which, however, is closely coupled to the p–n junction, it is not self-evident that it works more or less well. Using an analytically solvable distributed series resistance model and systematically treating the deviations from the ideal case of zero emitter resistance, the equivalent circuit is found in linear order in the sheet resistivity. In this linear order, the lumped voltage losses are fully compatible with the integrated Joule losses; this compatibility turns out to be a necessary and sufficient condition for modeling the local series resistance of a large-area silicon solar cell. In higher orders of the sheet resistivity, however, the lumped voltage losses are not compatible with the integrated Joule losses, which means that the equivalent circuit cannot describe these higher orders. The equivalent circuit resulting from the linear-order lumped series resistance accounts for the experimentally observed variation of the lumped series resistance along the current–voltage characteristic, which turns out to be fully described by a dependence on the dark diode current only.
关键词： Joule losses,equivalent circuit,solar cell modeling,voltage losses,local series resistance
更新于2025-09-12 10:27:22