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Proceedings Paper

The behavior of series resistance of a p-n junction: the diode and the solar cell cases
Author(s): Poliana H. Bueno; Diogo F. Costa; Alexander Eick; André Carvalho; Davies W. L. Monteiro
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Paper Abstract

This paper presents a comparison of the impact of the internal parasitic series resistance of a p-n junction, as seen from the microelectronics and photovoltaic communities. The elusive thermal behavior of the aforementioned resistance gave this work its origin. Each community uses a different approach to interpret the operational current-voltage behavior of a p-n junction, which might lead to confusion, since scientists and engineers of these two realms seldom interact. An improvement in the understanding of the different approaches will help one to better model the performance of devices based on p-n junctions and therefore it will favor the performance predictions of photovoltaic cells. For diodes, series resistance is usually determined from a specific forward-bias region of the I-V curve on a semi-logarithmic scale. However, in Photovoltaics this region is not commonly reported and therefore other methods to determine Rs are employed. We mathematically modeled an experimentally obtained I-V curve with various pairs of the ideality factor and Rs and found that more than one pair accurately synthesizes the measured curve. We can conclude that the reported series resistance not only depends on physical parameters, e.g. temperature or irradiance, but also on fitting parameters, i.e. the ideality factor. Generally the behavior of a p-n junction depends on its operating conditions and electrical modeling.

Paper Details

Date Published: 14 March 2016
PDF: 9 pages
Proc. SPIE 9743, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 97431F (14 March 2016); doi: 10.1117/12.2213229
Show Author Affiliations
Poliana H. Bueno, Univ. Federal de Minas Gerais (Brazil)
Diogo F. Costa, Univ. Federal de Minas Gerais (Brazil)
Alexander Eick, Univ. Federal de Minas Gerais (Brazil)
André Carvalho, Univ. Federal de Minas Gerais (Brazil)
Davies W. L. Monteiro, Univ. Federal de Minas Gerais (Brazil)

Published in SPIE Proceedings Vol. 9743:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V
Alexandre Freundlich; Laurent Lombez; Masakazu Sugiyama, Editor(s)

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