Figure 3.
Characterization of wide-bandgap perovskite solar cells with FA1–nCsnPb(I1–xBrx)3 absorbers in a p–i–n configuration. (a) External quantum efficiency (EQE) spectra (line and symbols) and corresponding short-circuit current-density (Jsc, dotted lines) calculated by integration of each EQE spectrum with the global AM1.5G solar spectrum. (b) J–V curves under simulated solar illumination recorded in forward (from short to open circuit) and reverse (from open to short circuit) bias for representative pixels. Summary of the (c) open-circuit voltage (Voc) and (d) power conversion efficiency (PCE) measured for perovskite solar cells as a function of the bandgap determined from Tauc analysis. In the right axis in (c), the open-circuit voltage deficit (Eg/q – Voc) is also reported (lines are guides to the eye).