Study of validity of the single-diode model for solar cells by I–V curves parameters extraction using a simple numerical method
| Autor: | Armando Acevedo-Luna, Arturo Morales-Acevedo |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry 020209 energy 02 engineering and technology Current source 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention law Photovoltaics Saturation current Electrical network Solar cell 0202 electrical engineering electronic engineering information engineering Equivalent circuit Electrical and Electronic Engineering Resistor 0210 nano-technology business Biological system Diode |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:15284-15290 |
| ISSN: | 1573-482X 0957-4522 |
| Popis: | The I–V measurement of solar cells is one of the most employed electrical characterization techniques in the photovoltaics research field due to the valuable information one can obtain from such a curve. Parameters like Voc, Isc and the maximum power can be easily observed at a glance. Furthermore, additional information can be extracted by a more exhaustive analysis involving the equivalent electrical circuit of a solar cell which is based on ideal electrical components with a well-defined behavior. This equivalent circuit is typically assumed to be formed by a current source in parallel with a single diode and a shunt resistor, connected to a series resistor. However, this model does not take into account the separate contributions of the different carrier transport mechanisms in solar cells; for example, carrier diffusion and recombination-generation in the depletion region. Therefore, the single diode model may not be suitable in many practical cases. In this work, a simple numerical method was developed to extract the parameters for both single diode and double diode models from experimental I–V curves of solar cells. The developed numerical algorithm was applied to extract the parameters for a published benchmark solar cell which has been used for testing this kind of algorithms. The extracted parameters using our simple method are comparable with other more sophisticated and computer power demanding algorithms. Thereafter, we applied the developed algorithm to extract the single-diode parameters from simulated “experimental” I–V curves, where two carrier transport mechanisms are present, trying to understand under what conditions the single diode approximation would provide meaningful parameters for such experimental curves. It is shown that the extracted parameters can vary strongly, particularly for the dark saturation current and ideality factor, without much variation of the root mean square error between the experimental data and the model, causing these values to be unreliable and its physical interpretation misleading. We show that the same algorithm can be applied to a double diode (two exponentials) model providing physically meaningful parameters without much computing power requirements. In summary, there is no further justification for using a single diode model to interpret the experimental I–V curves of real solar cells. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink