Intermediate Chemistry of Halide Perovskites: Origin, Evolution, and Application

Area of Science:

• Materials Science
• Chemistry

Background:

• Solution-processed metal halide perovskites are crucial for advanced optoelectronic devices.
• Their preparation involves complex intermediate chemistry that influences final film properties.

Purpose of the Study:

• To provide molecule-level insights into Lewis base additive (LBA) roles in perovskite film formation.
• To elucidate the chemical origin and structural evolution of intermediate phases.
• To connect intermediate chemistry to device applications.

Main Methods:

• Perspective-based review of existing literature on intermediate chemistry.
• Analysis of Lewis base additive interactions (coordination and hydrogen bonds) with perovskite precursors.
• Examination of structural transitions from intermediate phases to perovskite films.

Main Results:

• LBAs like DMSO and NMP interact with Lewis acid sites (A+ or B2+) in ABX3 structures.
• Two distinct intermediate structures are formed based on LBA interaction type (coordination vs. hydrogen bonds).
• These intermediates significantly influence the transition to the final perovskite phase.

Conclusions:

• Understanding intermediate chemistry is vital for controlling perovskite film formation.
• LBAs play a critical role in tailoring perovskite properties and device performance.
• Further research into intermediate chemistry will unlock multifaceted perovskite applications.