Hong Kong PolyU Achieves >90% Initial Efficiency Retention with Shade-Tolerant, Reverse-Bias Stable Perovskite-Organic Tandem Solar Cell

August 9, 2026

Facebook (Angstrom Engineering) Hong Kong

Overview

Researchers at Hong Kong Polytechnic University developed a perovskite-organic tandem solar cell that effectively addresses shading damage, a critical issue for thin-film photovoltaics. The new cell maintains over 90% of its initial efficiency under extreme reverse-bias conditions, overcoming a key weakness of conventional thin-film PV technology. This significantly enhances the durability and long-term performance of next-generation solar cells, accelerating their practical adoption in challenging installation environments. The article also references Trinasolar’s 31.1% efficiency achievement.

In Depth

Key Findings

A research team at Hong Kong Polytechnic University has developed a perovskite-organic tandem solar cell with significantly enhanced reverse-bias stability, capable of withstanding shading damage, a long-standing challenge for thin-film photovoltaics. This innovative cell demonstrates the ability to maintain over 90% of its initial power conversion efficiency even under extreme reverse-bias conditions induced by partial shading, dramatically improving its real-world reliability.

Technical / Clinical Details

The developed tandem solar cell employs a unique material composition and interface design to suppress internal leakage currents and effectively prevent voltage-induced degradation. This significantly mitigates the efficiency loss and physical damage from hot-spot formation that conventional thin-film solar cells experience due to shading.
Rigorous testing involved subjecting the device to prolonged periods of harsh reverse-bias stress, demonstrating its exceptionally high stability. This breakthrough is critical for dramatically improving the performance and lifespan of solar cells installed in shading-prone locations, such as rooftops or complex building facades.
The article also notes that Trinasolar achieved 31.1% efficiency in April 2025, and other manufacturers are reporting over 34% high efficiencies, indicative of broader advancements across perovskite technology.

Background & Context

Perovskite solar cells have garnered significant attention as a next-generation photovoltaic technology due to their advantages in high efficiency, low cost, and flexibility. However, for thin-film devices particularly, reverse-bias voltages generated by partial shading or defects have been a major challenge, leading to performance degradation and module failure. This issue has constrained the expansion of solar power system installation sites, but Hong Kong PolyU’s breakthrough offers a solution that could significantly broaden the applicability of thin-film solar cells.

Strategic Significance & Outlook

This reverse-bias stable perovskite-organic tandem solar cell will accelerate practical applications across a wide range of demanding environments, including urban buildings, flexible devices, and even vehicle-integrated photovoltaics. Solar cells that are robust against shading and offer extended lifespans will contribute to increased power generation stability and reduced maintenance costs, further promoting the adoption of sustainable energy solutions. The commercialization and large-scale production of this technology are expected to be a game-changer for the solar photovoltaic industry, enabling wider deployment in previously challenging scenarios globally.

Source: https://www.facebook.com/AngstromEngineering/posts/a-new-breakthrough-in-solar-technology-is-helping-address-one-of-thin-film-solar/1643376814457394/

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