Variable dimensionality in 'hollow' hybrid tin iodide perovskites

Area of Science:

• Materials Science
• Solid-State Chemistry
• Crystallography

Background:

• B-site deficient perovskites are a class of materials with tunable properties.
• Exploration of novel structural motifs in perovskite chemistry is ongoing.
• Tin-iodide based materials offer unique electronic and optical characteristics.

Purpose of the Study:

• To synthesize and characterize new 'hollow' B-site deficient perovskite structures.
• To investigate the structural diversity achievable within this material class.
• To report the first 2D layered structure of this specific type of perovskite.

Main Methods:

• Chemical synthesis of novel perovskite compounds.
• Single-crystal X-ray diffraction for structural determination.
• Reaction time manipulation to control dimensionality.

Main Results:

• Successful preparation of two distinct B-site deficient perovskites: (TzH)11(H3PO2)Sn6I23 and (TzH)3Sn2I7.
• (TzH)11(H3PO2)Sn6I23 represents the first reported 2D layered structure of its kind.
• The 3D derivative, (TzH)3Sn2I7, was obtained by extending the reaction time of the same precursor mixture.

Conclusions:

• The synthesis demonstrates the feasibility of creating 'hollow' B-site deficient perovskites with varying dimensionality.
• Structural dimensionality can be controlled by adjusting reaction conditions, specifically time.
• These findings contribute to the understanding and expansion of tin-iodide perovskite materials.