Multifunctional Titanium Oxynitride Layers Boost Performance and Durability in Perovskite-Silicon Tandem Solar Cells

August 2, 2026

Bioengineer.org Unknown

Overview

A new study published in Nature Energy reports a strategy utilizing TiOxNy (titanium oxynitride) as a multifunctional recombination interlayer in monolithic perovskite/silicon tandem solar cells. This TiOxNy layer simultaneously facilitates efficient charge recombination, maintains optical transparency, and significantly enhances interfacial chemical robustness, thereby improving device durability and scalability. This is a crucial breakthrough towards the commercialization of next-generation high-efficiency solar cells.

In Depth

Background

To further reduce the cost of solar power and maximize power output per unit area, technologies capable of surpassing the efficiency limits of current silicon solar cells are essential. Perovskite/silicon tandem solar cells emerge as a promising candidate to meet this demand, yet their commercialization has been hindered by issues such as device stability, manufacturing complexity, and scalability. The design of the intermediate layer within tandem structures is particularly crucial, as it fulfills vital optical, electrical, and chemical functions that profoundly influence overall performance. The development of the TiOxNy layer introduces a groundbreaking approach that simultaneously tackles these multifaceted challenges, representing a significant milestone toward the practical implementation of perovskite tandem solar cells. This underscores the critical role of materials science innovation in shaping the future of solar energy technology.

Key Findings

A recent study highlights the utilization of multifunctional titanium oxynitride (TiOxNy) layers, which demonstrably boost both the performance and durability of monolithic perovskite/silicon tandem solar cells. This TiOxNy layer effectively facilitates charge carrier recombination, maintains excellent optical transparency, and substantially enhances the chemical robustness of the interface. This synergistic combination of properties leads to improved overall device durability and greater manufacturing scalability, directly addressing critical hurdles in the practical deployment of next-generation high-efficiency solar cells.

Technical Details

Perovskite/silicon tandem solar cells are widely regarded as a promising technology to overcome the efficiency limitations of conventional solar cells, owing to their high theoretical conversion efficiency. Nevertheless, stability and manufacturing scalability have persisted as significant obstacles. The TiOxNy layer introduced in this research serves as a crucial recombination interlayer within the tandem structure. Its multifunctional nature enables it to fulfill several critical roles:

Enhanced Charge Recombination: The layer efficiently facilitates the recombination of electrons and holes generated between the top perovskite cell and the bottom silicon cell, ensuring smooth current flow. This minimizes internal losses and contributes to an improved overall device efficiency.
Maintained Optical Transparency: Exhibiting high transparency, the TiOxNy layer allows a broad spectrum of sunlight to pass through unimpeded, ensuring optimal light delivery to the underlying silicon cell. This optical characteristic is vital in tandem architectures, enabling each sub-cell to absorb its designated portion of the solar spectrum.
Improved Interfacial Chemical Robustness: Given the sensitivity of perovskite materials to moisture and heat, the TiOxNy layer functions as a robust protective barrier. This significantly enhances the chemical stability of the interface, thereby dramatically improving the device’s long-term durability and mitigating performance degradation under challenging environmental conditions.

By integrating these distinct characteristics, the TiOxNy layer successfully maintains the high efficiency of monolithic tandem devices while simultaneously extending their operational lifespan and enhancing their suitability for large-area manufacturing processes.

Strategic Significance & Outlook

The strategy of integrating a TiOxNy layer as a multifunctional recombination interlayer is poised to significantly accelerate the commercialization pathway for perovskite/silicon tandem solar cells. This technology, which expertly balances high performance with enhanced durability, is expected to find widespread adoption across diverse applications, from residential rooftops and large-scale solar farms to building-integrated photovoltaics (BIPV). Future research and development will focus on optimizing the large-area deposition processes for TiOxNy, reducing manufacturing costs, and conducting extensive long-term durability tests under real-world outdoor conditions. This breakthrough is anticipated to furnish the market with more efficient and reliable solar power solutions, thereby making a substantial contribution to the global adoption of renewable energy.

Source: https://www.bioengineer.org/multifunctional-titanium-oxynitride-layers-power-high-performance-perovskite-silicon-tandem-solar-cells/

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.