Material and Device Stability in Perovskite Solar Cells.

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Organic-inorganic halide perovskite solar cells demonstrate high power conversion efficiencies (up to 22%) and cost-effective fabrication.
• Commercialization of perovskite solar cells is hindered by significant device stability issues.
• Addressing long-term operational stability is crucial for the advancement of perovskite photovoltaic technology.

Purpose of the Study:

• To review recent progress in enhancing the stability of perovskite solar cells.
• To investigate factors influencing perovskite solar cell stability from both material and device perspectives.
• To provide a comprehensive understanding of degradation mechanisms and potential solutions.

Main Methods:

• Investigated decomposition mechanisms of perovskite materials under environmental stressors (moisture, photons, heat).
• Analyzed the stability of complete devices, considering interfaces and charge-selective contacts.
• Examined the relationship between ion migration, current-voltage hysteresis, and overall device stability.

Main Results:

• Identified moisture, photon exposure, and heat as key factors in perovskite material degradation.
• Highlighted the critical role of interfaces and selective contacts in determining full device stability.
• Established a strong correlation between ion migration, hysteresis, and reduced device longevity.

Conclusions:

• Improving perovskite solar cell stability requires a holistic approach, addressing both intrinsic material properties and extrinsic device architecture.
• Understanding and mitigating degradation pathways are essential for achieving reliable and commercially viable perovskite solar cells.
• Further research into ion migration and interface engineering is critical for enhancing long-term operational stability.