Flexible Perovskite-Silicon Tandem Cells Achieve Record 33.6% Efficiency and Robust Durability

August 9, 2026

AZoCleantech South Korea

Overview

A Korean research team has achieved a certified 33.6% power conversion efficiency in flexible perovskite-silicon tandem solar cells, while also demonstrating remarkable durability. These devices maintained 91% of their initial output after 5,000 bending cycles and passed 1,000 hours of damp-heat testing, significantly broadening their application potential in extreme environments. This breakthrough, alongside advancements in flexible perovskite/CIGS and lead-free tin-based perovskites, marks a crucial step toward the commercialization of flexible solar cells.

In Depth

Background

Flexible solar cells are in high demand across diverse applications—such as wearables, IoT sensors, curved building surfaces, and mobility—where rigid silicon panels are impractical. Perovskite solar cells, with their excellent light absorption properties and ease of solution processing, are considered a promising next-generation technology for flexible devices. However, balancing high PCE with long-term stability and durability has been a major hurdle for commercialization. This research represents a significant step towards overcoming these challenges.

Key Findings

A Korean research team has achieved a certified power conversion efficiency (PCE) of 33.6% for flexible perovskite-silicon tandem solar cells. Crucially, these devices demonstrated exceptional physical durability, retaining 91% of their initial output after 5,000 bending cycles and successfully passing 1,000 hours of damp-heat testing. This marks a significant advancement in addressing the reliability challenges crucial for the commercialization of flexible photovoltaics.

Technical Details

This breakthrough was realized through advancements in stacking perovskite and silicon layers on flexible substrates. The research also reported a 23.64% PCE for flexible perovskite/CIGS tandem cells, expanding the potential for multi-junction solar devices. Furthermore, lead-free tin-based perovskite solar cells achieved a certified efficiency of 15.7%, indicating progress in reducing reliance on lead-containing materials. Notably, mixed tin-lead perovskite single-junction cells recorded efficiencies exceeding 24%, reflecting the ongoing material science developments contributing to PCE enhancements.

Strategic Significance & Outlook

These achievements significantly boost the potential for flexible perovskite solar cells to be adopted in a wider range of markets. By combining high efficiency with superior bending resistance and damp-heat stability, the technology is poised to accelerate integration into portable power sources, mobile applications, and next-generation smart city infrastructure, particularly in harsh environments. Future milestones for practical implementation include further scaling up production, reducing manufacturing costs, and achieving compliance with stringent international standards.

Source: https://www.azocleantech.com/article.aspx?ArticleID=3354

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