Figure 4
(a) J-V curve of the flexible perovskite solar cell with a metal mask of 0.16 cm2; the inset is the steady-state PCE at a bias of 0.81 V. (b) The corresponding EQE curve. (c) Long-term stability of the device with an area of 0.16 cm2 stored in a glovebox. (d) J-V curve of the flexible perovskite solar cell (calculated area: 1.2 cm2) without the metal mask. (e) EQE curves of the device at three selected spots. (f) The steady-state photocurrent density and PCE of the large-area perovskite solar cells (1.2 cm2) at a bias of 0.78 V.
