The 3D-structure-mediated growth of zero-dimensional Cs₄SnX₆ nanocrystals

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Lead perovskite nanocrystals (NCs) have driven advances in optoelectronics.
• Synthesizing high-quality tin perovskite NCs, promising lead-free alternatives, remains a significant challenge.

Purpose of the Study:

• To develop a successful synthesis strategy for monodispersed, highly luminescent inorganic tin perovskite NCs.
• To investigate the crystal growth kinetics of these tin perovskite NCs.

Main Methods:

• Employed a three-dimensional (3D)-structure-mediated approach for nanocrystal synthesis.
• Utilized tracking of intermediate structures and theoretical simulations to elucidate crystal growth kinetics.

Main Results:

• Achieved synthesis of monodispersed, highly luminescent zero-dimensional (0D) tin perovskite NCs.
• Reported a record luminescence quantum yield of 52% for Cs₄SnBr₆ NCs.
• Synthesized Cs₄SnI₆ NCs with a 27% luminescence quantum yield, a 35-fold improvement.

Conclusions:

• The 3D-structure-mediated approach is effective for synthesizing high-performance tin perovskite NCs.
• Demonstrated the potential of these NCs in optoelectronic applications by fabricating a white-light-emitting device (WLED).