This work describes crystalline phases of the system [HSC(NH)]I/(CHNH)I/PbI and discusses the crystal structures in the context of a common cubic closest packing of organic cations and iodide anions with Pb in all anionic octahedral voids. Ternary boundary phases were (CHNH)PbI (3D perovskite), [HSC(NH)]PbI (1D perovskite), [HSC(NH)]PbI (NHCdCl type), and [HSC(NH)]PbI, with strands of edge-sharing octahedra of the NHCdCl type, which are connected to 2D layers via common corners. Within the system, we identified ribbonlike structures of the general composition [HSC(NH)](CHNH)PbI with = 2 and 3, representing the transition from 1D to 2D structures. Layered structures with variable thickness were found for the series [HSC(NH)](CHNH)PbI with = 1-3. The color and band gap correlate directly with the pattern of how the PbI octahedra are linked. 1D structures are colorless or pale yellow to orange. Layered structures are red to black, depending on the layer thickness. A first laboratory-scale solar cell yielded an efficiency of ∼6% based on the compound with = 3.
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