Phosphite-Protected Perovskite Solar Cells Hit 26.6% Efficiency, Boasting Unprecedented Precursor and Device Stability

July 12, 2026

ACS Applied Materials & Interfaces USA

Overview

A novel phosphite-assisted chemical protection strategy has enabled n-i-p type perovskite solar cells to achieve a certified power conversion efficiency of 26.6%. This technology dramatically enhances both the long-term shelf stability of the precursor solution, which remained effective for 21 days in ambient air, and the operational stability of the devices, retaining 90% of initial efficiency after 600 hours of continuous light exposure. This breakthrough offers a practical solution to key commercialization challenges for perovskite solar cells, namely stability and manufacturing process reliability.

In Depth

Background

Perovskite solar cells have garnered considerable attention as a next-generation photovoltaic technology due to their high power conversion efficiency and potential for low-cost manufacturing. However, their instability to humidity, heat, and light has been a major impediment to commercialization. Degradation of precursor solutions during storage, in particular, has directly impacted manufacturing yield and reliability. While previous research often focused on improving device stability, this study addresses the fundamental issue of precursor solution stability, enhancing the overall reliability of the manufacturing process.

Key Findings

This study reports a breakthrough in n-i-p type perovskite solar cells, achieving a certified power conversion efficiency of 26.6%. This exceptional performance is attributed to a novel phosphite-assisted chemical protection strategy, which dramatically enhances the stability of perovskite solar cells, both at the precursor solution level and in the final device.

Technical Details

The developed phosphite-assisted chemical protection method ensures the long-term shelf stability of the perovskite precursor solution. Specifically, devices fabricated from a precursor solution stored in ambient air for 21 days exhibited equivalent efficiency to those made from a fresh solution. This significantly improves the reliability and lifetime of precursor solutions in a manufacturing setting. Furthermore, the technology contributes to the operational stability of the device itself, demonstrating retention of 90% of its initial efficiency after 600 hours of continuous light exposure under maximum power point tracking. This substantial improvement in long-term reliability strengthens the potential for practical solar cell applications. The protection strategy plays a critical role in enhancing perovskite film stability and maintaining device performance over time.

Strategic Significance and Outlook

The phosphite-assisted chemical protection technology developed here is expected to simplify the manufacturing process of perovskite solar cells and directly lead to improvements in cost-efficiency and yield for large-scale production. Extending the shelf-life of precursor solutions increases supply chain flexibility and reduces manufacturing overheads. Moreover, the enhanced long-term stability of the devices themselves will improve reliability in real-world outdoor installations, accelerating commercial adoption. This technology is poised to be a crucial step in driving the market entry and widespread deployment of perovskite solar cells, offering a significant advantage over conventional solar technologies in terms of processability and performance durability.

Source: https://pubs.acs.org/doi/10.1021/acsami.6c07524

Get our weekly technology intelligence — free

Receive an infographic that lets you judge at a glance whether each field’s analysis report is worth reading.

Subscribe Free — Weekly Tech Intelligence

By subscribing, you’ll receive Troy-Technical’s weekly technology intelligence newsletter.