Tandem PV Announces 30.4% Efficient Perovskite/Silicon Demonstration Module

Why It Matters

Crossing 30% efficiency in a scalable tandem module could shift utility‑scale solar economics, while Granholm’s board role signals strong U.S. policy and investment backing.

Key Takeaways

• Tandem PV hit 30.4% efficiency on 100 cm² demo module.
• Design uses 4‑terminal perovskite glass atop Maxeon IBC silicon cell.
• Scalable process targets 28% efficiency in full‑size utility modules by 2026.
• Degradation rate projected at ~1% per year, close to silicon baseline.
• Former Energy Secretary Jennifer Granholm joins board, boosting policy credibility.

Pulse Analysis

The solar industry has long chased efficiencies beyond the 25‑percent ceiling of conventional single‑junction silicon cells. Perovskite‑silicon tandem structures have emerged as the most promising pathway, with laboratory cells recently topping 32 percent in tiny test areas. Tandem PV’s 30.4 percent conversion on a 100 cm² demonstration module marks the first time a near‑production‑scale device has crossed the 30 percent threshold, signaling that the technology is moving from academic proof‑of‑concept toward commercial viability. This milestone narrows the performance gap that has kept perovskite research on the periphery of utility‑scale deployment.

Tandem PV’s architecture relies on a proprietary four‑terminal perovskite glass stacked over a Maxeon interdigitated back‑contact (IBC) silicon cell, a configuration that can be paired with TOPCon, HJT or PERC silicon platforms. The company estimates a full‑size module could deliver 28 percent efficiency, delivering roughly 12 percent more power per square metre than today’s leading 25‑percent silicon modules. Early UV‑accelerated aging tests show a degradation rate near 1 percent per year, only modestly higher than the 0.6 percent benchmark for mature silicon. By keeping the design cell‑agnostic, Tandem PV positions itself to ride future silicon improvements without redesign.

From a market perspective, a 28‑percent utility module could reshape the economics of large‑scale solar farms, reducing land use and balance‑of‑system costs while accelerating the path to grid‑parity in higher‑latitude regions. The addition of former Energy Secretary Jennifer Granholm to the board underscores the strategic importance of domestic manufacturing and policy support for next‑generation photovoltaics. As the U.S. renewables agenda emphasizes supply‑chain resilience, Tandem PV’s claim of a scalable production process aligns with federal incentives and could attract significant utility and investor interest. The next step—third‑party certification—will be a critical hurdle before commercial roll‑out later this year.