FREMONT, Calif. — U.S.-based solar technology company, Tandem PV, has officially opened a new manufacturing facility in California, marking a significant milestone in the commercialization of perovskite-silicon tandem solar technology. This factory represents a major step from laboratory-scale development to full-scale industrial production.

The company is focusing on perovskite-on-silicon tandem solar panels, which have emerged as one of the most promising technologies to surpass the efficiency limits of traditional silicon solar cells. Tandem PV’s production facility will use a two-terminal (2T) monolithic design, integrating a wide-bandgap perovskite top cell with a silicon bottom cell, which together form a single electrical circuit. This configuration is particularly advantageous because it is compatible with existing silicon manufacturing lines and minimizes additional system-level complexity.

Why Perovskite-Silicon Tandem Cells Are the Future of Solar

Initial production at the new facility is expected to achieve module efficiencies in the range of 26–28% by 2026. This efficiency surpasses the limits of current commercial silicon technologies such as TOPCon and HJT, which typically have a maximum efficiency of 24–26%.

These efficiency gains come from improved spectral utilization: the perovskite layer absorbs high-energy photons, while the silicon layer captures lower-energy photons, optimizing the full spectrum of sunlight and significantly reducing energy losses.

Cost Reduction and the Future of Solar Power

While perovskite-silicon tandem panels require additional processing steps—such as perovskite deposition and enhanced encapsulation to mitigate moisture sensitivity—the economic model remains strong. Higher efficiency enables lower system costs, as less land, mounting hardware, and cabling are required.

This means levelized cost of electricity (LCOE) for solar power could drop by as much as 10–25%, depending on the application. The technology is particularly well-suited for utility-scale projects and space-constrained environments, where maximizing energy density is crucial.

A Scalable Manufacturing Approach

A key differentiator in Tandem PV's approach is the low-capital expenditure (CapEx) required to retrofit existing silicon production lines. Rather than building new manufacturing ecosystems, the company integrates perovskite deposition into already established silicon production facilities. This strategy reduces capital barriers and accelerates the scaling timeline compared to other next-generation photovoltaic technologies.

Positioning in the Competitive Solar Landscape

Tandem PV enters a competitive field that includes Oxford PV, a leader in commercializing tandem technology, and LONGi Green Energy, which is also investing heavily in perovskite-silicon technology. Another competitor, First Solar, continues to dominate the thin-film solar market, focusing on cost-effective cadmium telluride (CdTe) panels.

However, Tandem PV’s focus on U.S.-based manufacturing and its scalable integration with existing production infrastructure set it apart from competitors in the growing market for high-efficiency solar panels.

Outlook for Tandem PV and the Solar Industry

The opening of Tandem PV’s new facility in Fremont signifies a major transition in the solar industry—from experimental validation to commercial-scale production. The company's roadmap includes ramping up production in 2026 with a goal of achieving large-scale manufacturing by 2028. If successful, this facility will serve as a blueprint for scaling next-generation photovoltaics globally.

By introducing perovskite-silicon tandem solar panels to the mass market, Tandem PV is helping to pave the way for cleaner, more affordable energy. As solar power becomes an increasingly important component of global energy infrastructure, Tandem PV’s innovations are positioned to make a significant impact on the future of renewable energy.