Related Experiment Video
Updated: Nov 17, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
From 1D to 3D: Perovskites within the System HSC(NH2)2I/CH3NH3I/PbI2 with Maintenance of the Cubic Closest Packing
Michael Daub1,2, Harald Hillebrecht1,2,3
1Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, Freiburg D-79104, Germany.
Abstract:
This work describes crystalline phases of the system [HSC(NH2)2]I/(CH3NH3)I/PbI2 and discusses the crystal structures in the context of a common cubic closest packing of organic cations and iodide anions with Pb2+ in all anionic octahedral voids. Ternary boundary phases were (CH3NH3)PbI3 (3D perovskite), [HSC(NH2)2]3PbI5 (1D perovskite), [HSC(NH2)2]PbI3 (NH4CdCl3 type), and [HSC(NH2)2]Pb2I5, with strands of edge-sharing octahedra of the NH4CdCl3 type, which are connected to 2D layers via common corners. Within the system, we identified ribbonlike structures of the general composition [HSC(NH2)2](CH3NH3)PbI4 with m = 2 and 3, representing the transition from 1D to 2D structures. Layered structures with variable thickness were found for the series [HSC(NH2)2](CH3NH3)PbI3 with n = 1-3. The color and band gap correlate directly with the pattern of how the PbI6 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 n = 3.
More Related Videos
08:12Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
11:38Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Related Concept Videos
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
Valence Bond Theory
VSEPR Theory and the Basic Shapes
Hybridization of Atomic Orbitals I
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...