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. 2021 Mar 10;8(10):2004593. doi: 10.1002/advs.202004593

Figure 9.

Figure 9

a) Schematic structure of the different barriers (R‐NH3): phenethylammonium iodide (PEA), benzylammonium iodide (BA), and cyclohexylammonium iodide (CHMA). b) Solar cell architecture used in this study. c) HR‐SEM cross section of the solar cell with the 2D/3D (n = 40) perovskite, where the CHMA is the barrier molecule. d) Stability measurements of solar cells based on 2D/3D perovskites (n = 40) of the different barriers and of the 3D perovskite under 1 sun illumination, 30−50% humidity, and for 205 h. e) Stability measurements of solar cells based on 2D/3D mixed cation perovskites (n = 40) of the different barriers and of the 3D mixed cation perovskite under 1 sun illumination, 30−50% humidity, and for 205 h. Inset shows the schematic illustration of distorted layered mixed cation MA + Cs perovskite with CHMA as a spacer. f) Photo of the solar cell before the stability measurements (top). Photo of the solar cell based on a mixed cation (Cs + MA) and the corresponding spacer after the stability measurements (middle). Photo of the solar cell based on the corresponding spacer after the stability measurements (bottom). Reproduced with permission.[ 69 ] Copyright 2020, American Chemical Society.