Influence of photogenerated currents imbalance on current-voltage characteristics of multijunction solar cells
Mintairov M. A.1, Evstropov V. V.1, Mintairov S. A.1, Shvarts M. Z.1, Kalyuzhnyy N. A.1
1Ioffe Institute, St. Petersburg, Russia
Email: mamint@mail.ioffe.ru
In this work, the influence of the imbalance of photogenerated currents on the current-voltage and photovoltaic characteristics of multijunction solar cells has been studied. The imbalance effect has been shown to induce the deviation of light current-voltage characteristics from the logarithmic shape. At the same time, photovoltaic dependences measured in the open-circuit and maximum-power-point modes (including the efficiency and fill factor) appear as logarithmic but shifted by constant values from those in the case of the photogenerated currents balance. This behavior of the characteristics has been experimentally verified for a triple-junction GaInP/GaAs/Ge solar cell. Keywords: imbalance of photogenerated currents, current-voltage characteristics, multijunction solar cells.
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