Halide Double Perovskites: Insights into Structure, Defects, and Luminescence

Area of Science:

• Materials Science
• Solid-State Physics
• Photochemistry

Background:

• Lead halide perovskites exhibit excellent optoelectronic properties but suffer from lead toxicity and poor stability.
• Environmentally friendly alternatives are crucial for advancing perovskite-based technologies.
• Halide double perovskites (HDPs) emerge as promising candidates due to their inherent stability and reduced toxicity.

Purpose of the Study:

• To review the structural, optical, and electronic properties of halide double perovskites (HDPs).
• To explore doping strategies for optimizing photoluminescence quantum yield (PLQY) in HDPs.
• To discuss defect management and processing challenges for improved device performance.

Main Methods:

• Comprehensive review of theoretical and experimental studies on HDPs.
• Analysis of doping effects on photoluminescence (PL) properties, including PLQY and spectral range.
• Examination of defect chemistry and passivation techniques.

Main Results:

• Doping can significantly enhance PLQY in HDPs, reaching up to 100%.
• HDPs demonstrate broad photoluminescence across the UV-vis-IR spectrum with extended lifetimes.
• Defect passivation strategies are identified as critical for improving stability and optoelectronic performance.

Conclusions:

• HDPs present a viable, stable, and less toxic alternative to lead halide perovskites.
• Optimized doping and defect passivation are key to unlocking the full potential of HDPs for light harvesting and other optoelectronic applications.
• Further research into material and film processing is essential for practical device implementation.