How photoluminescence can predict the efficiency of solar cells

The efficiency of solar cells depends on the photocurrent, open circuit voltage and fill factor, which in turn diode factor. We review how photoluminescence measurements absorber, without finishing cell, reveal maximum best that can be reached finished device. discuss two different ways to extract quasi Fermi level splitting from absolute calibrated spectra, measured at a one-sun excitation. absorption spectrum cell absorber extracted spectra allows reliable determination tail states. Tail states are responsible for radiative non-radiative losses splitting. In ideal case is given by However, recombination interface reduce severely. various electronic structures lead reduction voltage. excitation dependence determine factor alone, would 1 case. Metastable defects increase even neutral zone low This effect decreases cell.