Fig. 2
From: Unveiling the operation mechanism of layered perovskite solar cells
Layered perovskite single crystals synthesis and characterization. a (left panel) Schematic of (BA)2(MA)2Pb3I10 single crystal plate growth method; (right panel) photograph of (BA)2(MA)2Pb3I10 single crystal platelet floating on the solution surfaces in a glass vial (the vial diameter is 25 mm), and the hand-cut rectangular single crystal platelet stick to a glass substrate (15 mm × 15 mm). X-ray diffraction (XRD) pattern (b) and absorption spectra (c) of (BA)2(MA)2Pb3I10 single crystal (the pink dot indicates the main exciton peak and the black dot indicates the position of the band-to-band absorption edge)
