HZB and HTW Berlin Develop Novel Method to Predict Long-Term Stability of Perovskite Solar Cells, Enhancing Accelerated Degradation Testing

EurekAlert! Germany

Overview

Researchers from Helmholtz-Zentrum Berlin (HZB) and HTW Berlin have published a groundbreaking method in Joule for more accurately assessing the long-term stability of perovskite solar cells. Through 20 months of outdoor degradation testing, they identified three key degradation mechanisms: phase separation, copper corrosion, and edge patterns. Crucially, they demonstrated that increasing light intensity can accelerate all these degradation processes, promising a significant boost in the accuracy and reliability of accelerated aging tests.

In Depth

Key Findings: New Methodology Established for Long-Term Stability Assessment of Perovskite Solar Cells

A joint research team from Germany’s Helmholtz-Zentrum Berlin (HZB) and HTW Berlin has developed an innovative approach to evaluate the long-term stability of perovskite solar cells, publishing their findings in the scientific journal Joule. This study provides crucial guidelines for improving the reliability of accelerated degradation tests by meticulously analyzing the degradation behavior of solar cells under real outdoor conditions. Specifically, the team identified three primary degradation mechanisms over a 20-month period of natural degradation testing and demonstrated that these processes can be significantly accelerated by increasing light intensity.

Technical Details: Identification of Degradation Mechanisms and Acceleration Techniques

• Identified Degradation Mechanisms:
  • Phase Separation: This phenomenon involves changes in the crystalline structure of perovskite materials over time, leading to performance degradation. It is particularly common in mixed-cation perovskite systems.
  • Copper Corrosion: Copper, often used in solar cell module electrodes and wiring, can react with the perovskite layer or the surrounding environment, causing corrosion. This leads to poor electrical contact, impacting the module’s electrical pathways and resulting in reduced power output.
  • Edge Patterns: These refer to visible patterns and performance deterioration caused by moisture and oxygen ingress from the module edges, leading to degradation of the perovskite layer. Improving encapsulation technology is vital for addressing this issue.
• Acceleration via Light Intensity: The research team successfully demonstrated that increasing the light intensity irradiated onto the solar cells can simultaneously accelerate all three identified degradation mechanisms. This breakthrough enables the replication of 20 months of real-world degradation in a much shorter accelerated test, dramatically shortening the durability assessment cycle for new materials and devices.

Background and Industry Context

Perovskite solar cells are highly anticipated as a next-generation photovoltaic technology due to their high energy conversion efficiency and potential for low-cost manufacturing. However, a major challenge to their commercialization has been ensuring long-term stability, especially maintaining performance under harsh outdoor conditions. Traditional stability evaluation methods are time-consuming and expensive, hindering the development cycle of new materials. This new research offers a quicker and more accurate method for accelerated degradation testing, significantly bolstering the credibility and market adoption of perovskite solar cells.

Strategic Significance and Outlook

The findings from HZB and HTW Berlin are expected to have a direct impact on the design and material development of perovskite solar cells. Degradation mechanisms’ clear understanding, coupled with established accelerated testing methods, will foster the development of more stable perovskite materials and device architectures. This will, in turn, make product lifetime guarantees easier to achieve, building greater trust among investors and consumers. In the future, this new evaluation method is anticipated to become an industry standard, providing a fundamental basis for perovskite solar cells to achieve multi-decade stable operation, comparable to conventional silicon solar cells.

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