Elimination of artifacts in external quantum efficiency measurements for multijunction solar cells using a pulsed light bias

A method using a pulsed light bias synchronized to the probing monochromatic light and superimposed on the conventional dc light and voltage biases is proposed to eliminate the artifacts in external quantum efficiency (EQE) measurements for multijunction solar cells. It is demonstrated experimentally that this method effectively eliminates the EQE measurement artifacts caused by the shunt effect, the luminescence coupling effect, or their combination.