Fig. 1From: Lead-free perovskite solar cells using Sb and Bi-based A3B2X9 and A3BX6 crystals with normal and inverse cell structuresStructures of fabricated solution processed lead-free A3B2X9 and A3BX6 crystal (A: monovalent cation; B: trivalent cation; X: halogen anion) solar cells: normal mesoscopic (n-i-p) (a) and inverted planar (p-i-n) (b) structuresBack to article page