2D Ruddlesden-Popper Perovskites with a Thick Octahedral Layer (n = 7) as a Robust Alternative for Energy-Related...

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Halide perovskites offer excellent optoelectronic properties but suffer from poor operational stability, particularly 3D methylammonium lead iodide (MAPbI3).
• Improving the stability of perovskite materials is crucial for their application in energy devices.

Purpose of the Study:

• To synthesize and characterize Ruddlesden-Popper iodide perovskites with varying n values (1, 2, and 7) using a butylammonium spacer.
• To compare the stability and optoelectronic properties of the quasi-3D (n=7) phase with 3D MAPbI3.
• To evaluate the potential of quasi-3D perovskites for enhanced chemical and mechanical stability in energy applications.

Main Methods:

• Synthesis of Ruddlesden-Popper iodide series (n=1, 2, 7) with butylammonium spacer.
• Structural, morphological, and optical characterization.
• In situ photoluminescence measurements using a diamond-anvil cell under hydrostatic pressure.

Main Results:

• The n=7 phase (quasi-3D) exhibits structural and optical properties similar to 3D MAPbI3.
• The quasi-3D phase demonstrates superior photoluminescence stability under high hydrostatic pressure, with reversible recovery after decompression.
• Enhanced hydrophobicity and comparable light-induced photoconductivity were observed for the quasi-3D sample.

Conclusions:

• Thick-layer (n=7) Ruddlesden-Popper perovskites offer a promising strategy to enhance chemical and mechanical stability.
• These quasi-3D perovskites maintain 3D-like optoelectronic functionality, making them suitable for energy-related devices.
• The improved pressure tolerance suggests enhanced robustness for perovskite-based technologies.