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We have investigated a useful method of extracting the electrical parameters of each subcell in a multi-junction solar cell from bias-voltage-dependent spectral response data (SR-V) which are obtained without light bias. Colored bias lights are commonly employed for biasing the respective subcells except for the targeted subcell, which is to be characterized. The extracted parameters for each subcell are J0, dark saturation current; Rs, series resistance; Rsh, shunt resistance; and Jphoto, photo current. The program code for the analysis has been developed with a nonlinear least-square method, Powell Hybrid algorithm. It is shown that this algorithm results in a stable convergence and the experimental results on the dark current–voltage (I–V) characteristics and photo I–V curves can be reliably reproduced using the extracted electrical parameters using this method.
Ogura et al. (Wed,) studied this question.