Current invariant as a method of searching for the optimum band gap of subcells of multijunction solar cells
Mintairov M. A. 1, Evstropov V. V.1, Mintairov S. A.1, Salii R. A. 1, Shvarts M. Z.1, Kalyuzhnyy N. A.1
1Ioffe Institute, St. Petersburg, Russia
Email: mamint@scell.ioffe.ru
The possibility of application of a semiempirical expression, which specifies the principal saturation currents of a p-n junction, in calculation of the efficiency of multijunction solar cells is examined. This expression relies on the following current invariants obtained earlier: JZ1 for saturation current J01 (ideality factor A=1) and JZ2 for saturation current J02 (A=2). It is demonstrated that the use of JZ1 and JZ2 provides an opportunity to enhance the accuracy of calculations considerably relative to the standard techniques based on the Shockley-Queisser solar cell model. The introduction of saturation current J02 into calculations is a novel feature. It is demonstrated that the addition of J02 is a prerequisite to realistic estimation of the efficiency of multijunction solar cells with more than two subcells. Keywords: solar cell, saturation current, current invariant, efficiency.
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