Positive and Negative Effects under Light Illumination in Halide Perovskites

Area of Science:

• Materials Science
• Solid-State Physics
• Photovoltaics

Background:

• Metal halide perovskites (MHPs) exhibit promising optoelectronic properties for applications like solar cells and LEDs.
• Device stability under illumination, particularly light-induced anomalous phenomena, remains a critical challenge.
• Existing research often overlooks the positive effects of light soaking on MHPs.

Purpose of the Study:

• To systematically review both positive and negative effects of light soaking in MHPs.
• To classify the underlying physical mechanisms, emphasizing timescales from seconds to hours.
• To provide insights into ion effects and guide the development of stable perovskite devices.

Main Methods:

• Literature review and theoretical analysis of light-induced phenomena in MHPs.
• Classification of effects based on timescale and physical mechanisms.
• Focus on ionic-electronic interactions and their role in perovskite properties.

Main Results:

• Light soaking induces diverse phenomena in MHPs, including photoluminescence enhancement, defect curing, blinking, and phase segregation.
• These effects are intrinsically linked to the performance and long-term stability of MHP-based devices.
• A timescale-dependent analysis reveals the crucial role of ionic-electronic interactions.

Conclusions:

• Understanding both positive and negative light-induced effects is essential for optimizing MHP devices.
• The study provides a framework for analyzing charge-carrier and ion dynamics in perovskites.
• This work offers theoretical guidance for fabricating high-quality, stable perovskite photovoltaic and photoelectric devices.