Preparation and luminescence study of green lighting MAPbBr₃ perovskite thin films in air environment

Area of Science:

• Optoelectronics
• Materials Science

Background:

• Organic-inorganic hybrid metal halide perovskites offer excellent optoelectronic properties.
• Perovskite films are highly sensitive to moisture and oxygen, necessitating glove box conditions for preparation.
• This sensitivity hinders industrial-scale production of perovskite-based devices.

Purpose of the Study:

• To investigate the feasibility of preparing perovskite luminescent films in an ambient air environment.
• To evaluate the impact of additives on the luminescence properties and film quality of perovskites.
• To demonstrate the potential for large-scale industrial production of air-processed perovskite films.

Main Methods:

• Three perovskite precursor solutions were prepared: pure MAPbBr₃, MAPbBr₃ + GBA, and MAPbBr₃ + GBA + PEO.
• The luminescence properties and film quality of the resulting perovskite films were analyzed.
• Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) were used to assess film morphology and crystallinity.

Main Results:

• The addition of GBA and PEO enhanced photoluminescence properties, with the MAPbBr₃ + GBA + PEO film exhibiting the best performance.
• SEM and XRD analyses revealed that GBA and PEO reduce film porosity, improve grain bonding, and enhance crystallization quality, indicating defect passivation.
• The MAPbBr₃ + GBA + PEO film maintained 95.5% of its initial photoluminescence intensity after one week in air, demonstrating excellent stability.

Conclusions:

• GBA and PEO additives are effective in passivating defects and improving the quality of perovskite films.
• Perovskite luminescent films can be successfully synthesized in an air environment, paving the way for industrial mass production.
• The developed air-processed perovskite films are suitable for optoelectronic applications, as demonstrated by their use in a green-light-emitting perovskite light-emitting diode.