A method of measuring solar cells, wherein a voltage (U) or a current (I) is applied to a solar cell, and a current (I) and voltage (U), respectively, resulting therefrom is measured, and wherein prior to applying the voltage (U) or current (I) and during or after measuring the resulting current (I) and resulting voltage (U), respectively, a relative distribution of radiation emitted across the solar cell surface area is measured, wherein the voltage (U) or current (I) is applied as at least one pulse with a predeterminable, constant value for a predeterminable period of time, wherein an energy value is calculated from the resulting current (I) and resulting voltage (U), respectively, wherein a first relative distribution of radiation emitted across the solar cell surface area is measured prior to the pulse or each pulse and a second relative distribution of radiation emitted across the solar cell surface area is measured during or after the pulse or each pulse, and wherein a difference distribution is generated from the first and second relative distributions and scaled to the calculated energy value. An apparatus for performing the method. The method and the apparatus serve for the improved sorting of solar cells.