On the Nature of the One-Diode Solar Cell Model Parameters

Andreea Sabadus and Marius Paulescu
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Andreea Sabadus: Department of Physics, West University of Timisoara, V. Parvan 4, 300223 Timisoara, Romania
Marius Paulescu: Department of Physics, West University of Timisoara, V. Parvan 4, 300223 Timisoara, Romania

Energies, 2021, vol. 14, issue 13, 1-10

Abstract: The one-diode model is probably the most common equivalent electrical circuit of a real crystalline solar cell. Extensive research has focused on extracting model parameters from measurements performed in standard test conditions (STC), aiming to replicate the current-voltage characteristics (I-V). This study started from finding that, for the same solar cell, different scientific reports yield significantly different sets of parameters, all allowing for highly accurate replication of the measured I-V characteristics. This observation raises a big question: What is the true physical set of parameters? The present study attempts to address this question. For this purpose, a numerical experiment was conducted. The results show that there is an infinity of distinct sets of parameters that can replicate the I-V characteristics at STC via the one-diode model equation. The diode saturation current I S and the diode ideality factor compensate each other to preserve the open-circuit voltage V OC , always an input data point. Some possible approaches (e.g., the link between V OC and I S ) that can lead to the physical set of parameters are discussed, highlighting their strengths and weaknesses. There is enough room for future research on finding a universal approach able to guarantee the accurate extraction of the one-diode model physical parameters.

Keywords: solar cell; I-V characteristics; one-diode model; parameter extraction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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