Solid-State Ionics of Hybrid Halide Perovskites

Area of Science:

• Materials Science
• Solid-State Chemistry
• Photovoltaics

Background:

• Photoactive halide perovskites are key materials in photovoltaics.
• Observed anomalies in their long-time and low-frequency phenomena are widespread.
• These phenomena are often viewed as unexpected challenges in the field.

Purpose of the Study:

• To re-evaluate observed anomalies in halide perovskites from a solid-state ionics perspective.
• To demonstrate the utility of the solid-state ionics toolbox for understanding these materials.
• To explore methods for conditioning and improving halide perovskite properties.

Main Methods:

• Analysis of mixed conducting properties of halide perovskites.
• Application of solid-state ionics principles.
• Consideration of equilibrium bulk properties.
• Investigation of interfacial effects.
• Examination of light effects on mixed conductivity.

Main Results:

• Many "anomalies" in halide perovskites are predictable using solid-state ionics.
• The mixed conducting nature of these materials is central to their behavior.
• Solid-state ionics provides a framework for understanding interfacial and light-induced effects.

Conclusions:

• Solid-state ionics offers a powerful lens to interpret and address challenges in halide perovskite photovoltaics.
• The mixed conducting nature and associated ionic transport phenomena are crucial.
• This approach can guide strategies for material conditioning and performance enhancement.