Suzhou University: Perovskite/Silicon tandem 34% efficiency specs

September 26, 2026

EurekAlert! China

Overview

Researchers at Suzhou University in China achieved a 34.0% power conversion efficiency for perovskite/silicon tandem solar cells, independently certified at 33.5% steady-state efficiency. This device recorded an unprecedented 2.014V open-circuit voltage, the highest ever for this class of solar cells. The introduction of a nano-scaffold structure suppressed non-uniform perovskite growth and non-radiative recombination at interfaces, significantly enhancing both efficiency and durability.

In Depth

Key Findings

A research team from Suzhou University in China has achieved a groundbreaking increase in the power conversion efficiency of perovskite/silicon tandem solar cells, reaching 34.0% in laboratory settings. This device was independently certified with a steady-state efficiency of 33.5% and, remarkably, recorded an unprecedented open-circuit voltage of 2.014V, the highest ever for this class of solar cells. This breakthrough was made possible through the introduction of a novel nano-scaffold structure.

Technical / Clinical Details

The research team implemented an innovative nano-scaffold structure to precisely control the growth of the perovskite layer. This intricate architecture inhibits non-uniform perovskite crystal growth, enabling the formation of a more homogeneous and high-quality film. Consequently, non-radiative recombination of charge carriers (a primary cause of energy loss) at the perovskite/silicon interface was significantly reduced, leading to an enhanced solar cell efficiency. The exceptionally high open-circuit voltage of 2.014V specifically indicates superb voltage matching between the sub-cells within the tandem structure, pushing the limits of conventional devices. This technology is also expected to contribute to improved device durability alongside efficiency gains.

Background & Context

Tandem solar cells, which stack multiple absorber layers with different bandgaps, are next-generation technologies with the potential to capture a broader range of the solar spectrum and surpass the Shockley-Queisser limit of single-junction cells. Perovskite/silicon tandem solar cells are considered one of the most promising tandem architectures, combining the high light absorption properties of perovskites with the established stability and low-cost manufacturing capabilities of silicon. The achievement of 34% efficiency represents a world-leading record and will significantly impact the efficiency competition across the entire photovoltaic industry.

Strategic Significance & Outlook

This nano-scaffold technology holds significant potential to accelerate the commercialization of perovskite/silicon tandem solar cells. Moving forward, the research team will likely focus on scaling up the manufacturing process of these high-efficiency devices and improving cost-effectiveness. The 34% efficiency will further reduce the levelized cost of solar electricity, significantly contributing to the widespread adoption of sustainable energy. Moreover, this technical breakthrough is expected to inspire new developments in other tandem structures and next-generation solar cell technologies.

Source: https://www.eurekalert.org/news-releases/1144549

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