Characterizing GaInP/GaInAs/Ge Multijunction Solar Cells With Electroluminescence

摘要: We show how characterization of GaInP/GaInAs/Ge multijunction solar cells benefits from the use electroluminescence (EL) measurements. Usual methods involving optical excitation and measurement electrical response are challenging when they applied to concentrator due necessity high power precise simulation sunlight. By inversing direction response, individual information about subcells becomes accessible at injection conditions. an electro-optical reciprocity theorem that describes link between cell quantum efficiency electroluminescent emission extract current/voltage curves EL spectra. This is accomplished by comparing spectra with independently measured curve. The comparison allows us determine relative voltage differences three junctions, while curve adjust offset axis. final results internal voltages all currents, where were measured. yields for example diode quality factors as well difference their respective radiative limits.