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Proton Transfer-Driven Modification of 3D Hybrid Perovskites to Form Oriented 2D Ruddlesden-Popper Phases
Zonghui Duan1, Guangren Na2, Shixun Wang1
1Department of Materials Science and Engineering Centre for Functional Photonics (CFP) City University of Hong Kong Hong Kong SAR 999077 P. R. China.
Small Science
|April 11, 2025
Summary
Researchers developed a method to transform 3D methylammonium lead halide perovskites into 2D Ruddlesden-Popper phases using aliphatic alkylamines. This process allows tuning of perovskite structures and enhances green light emission for advanced optoelectronic applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Methylammonium lead halide perovskites are promising optoelectronic materials.
- Controlling the dimensionality of perovskite structures is crucial for tuning their properties.
- Existing methods for creating 2D perovskites can be complex.
Purpose of the Study:
- To establish a facile fabrication route for hybrid 3D/2D and purely 2D Ruddlesden-Popper perovskite phases.
- To investigate the effect of aliphatic alkylamines on perovskite phase transformation.
- To optimize perovskite films for enhanced optical properties, particularly green emission.
Main Methods:
- Utilizing five aliphatic alkylamines (butylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine) as antisolvents in toluene during spin-coating.
- Inducing proton transfer from alkylamines to the perovskite organic moiety.
- Controlling the 3D/2D phase ratio via alkylamine concentration.
- Characterizing the resulting perovskite films using photoluminescence spectroscopy.
Main Results:
- A proton transfer mechanism was identified, enabling the conversion of 3D perovskites to hybrid 3D/2D and 2D Ruddlesden-Popper phases.
- Longer-chain alkylamines (≥12 carbons) effectively facilitated the transformation, yielding layered perovskites.
- Photoluminescence quantum yield for green emission reached up to 38% in films.
- Complete conversion to 2D Ruddlesden-Popper phases with substrate-parallel orientation was achieved above a specific alkylamine concentration.
Conclusions:
- A straightforward method for modifying perovskite phase and dimensionality using alkylamine antisolvents was demonstrated.
- This approach offers precise control over the 3D/2D perovskite ratio and crystalline orientation.
- The developed technique provides access to various 2D Ruddlesden-Popper perovskite films with tunable and enhanced optical properties for potential applications.
