Fig. 15: Sub-bandgap external quantum efficiency measurement for determining sub-bandgap defect states in perovskite.
From: Advanced spectroscopic techniques for characterizing defects in perovskite solar cells
\(\triangle {{{\rm{s}}}}-{{{\rm{EQE}}}}\) spectra (open circle) and Gaussian fitting results (lines) of Ag-contact and ITO-contact MAPbI3 devices upon light soaking (0.5, 10, and 20 h). Reproduced with permission from ref. 86, copyright (Wiley-VCH GmbH, 2021).
