Hanwha Qcells is launching perovskite-silicon tandem solar cells to the Moon as part of a NASA-backed mission to test whether next-generation solar technology can survive extreme space conditions and eventually power Earth-based AI infrastructure. The company's cells will be mounted on a lunar lander and exposed to vacuum, cosmic radiation, and temperature swings as part of the Space Science and Technology Evaluation Facility-1 (SSTEF-1) mission, led by the Georgia Tech Research Institute (GTRI) in collaboration with NASA.

Why Is AI Driving a Solar Technology Race?

Global investment in solar energy is accelerating at an unprecedented pace. Spending is expected to reach approximately $365 billion in 2026, more than any other power generation technology, according to the International Energy Agency's World Energy Investment 2026 report. The surge is being fueled by three major forces: rising demand from AI data centers, increased electrification across industries, and a stronger focus on energy security. As AI companies build massive data centers to train and run large language models, they are consuming enormous amounts of electricity, creating urgent demand for renewable energy sources that can scale quickly.

Traditional silicon solar cells, which have powered the industry's rapid growth, are hitting a wall. Conventional silicon cells have a theoretical efficiency ceiling of 29.4%, and the best laboratory cells have already reached 27.9%, leaving little room for further improvements. To generate more power from the same surface area without expanding physical footprints, the solar industry needs a technological leap forward.

What Makes Tandem Solar Cells Different?

Perovskite-silicon tandem cells represent the most promising solution to break through silicon's efficiency limits. Instead of using a single light-absorbing layer, tandem cells stack two materials to capture more of the solar spectrum. A perovskite layer absorbs higher-energy light, while the silicon layer beneath captures the remaining wavelengths, allowing the cell to generate significantly more electricity without increasing its physical size.

Qcells has already demonstrated the commercial viability of this approach. The company reported 28.6% certified efficiency on a full-area M10 tandem cell, verified by the Fraunhofer Institute for Solar Energy Systems (ISE). Critically, these results were achieved using commercial manufacturing processes, not laboratory conditions, which means the technology can potentially be scaled to mass production. In 2026, Qcells became the first company to receive certification from TÜV Rheinland, confirming that its tandem modules meet both IEC and UL standards, including rigorous thermal cycling and damp heat tests.

How Will the Lunar Mission Test Solar Technology?

While laboratories can test individual stresses like radiation or thermal cycling in isolation, the lunar surface exposes solar cells to all of these factors simultaneously over extended periods. The SSTEF-1 mission will expose Qcells' tandem cells to conditions that no terrestrial testing facility can reproduce at once:

• Vacuum Exposure: The absence of atmosphere creates unique stress on materials and electrical systems that cannot be fully replicated on Earth.
• Cosmic Radiation: High-energy particles from space can degrade semiconductor materials and alter electrical properties over time.
• Extreme Temperature Swings: Lunar surface temperatures fluctuate dramatically between sunlit and shadowed regions, testing material durability and structural integrity.
• Lunar Dust: Fine, abrasive particles can accumulate on cell surfaces and affect performance and longevity.

The data collected from this mission will directly inform the design of next-generation solar cells for both space applications and Earth-based infrastructure. Lunar and long-duration space missions require power systems that are lightweight, efficient, and durable, since every kilogram carries a launch cost and hardware must operate for years without servicing. These same principles apply to solar installations supporting AI data centers, where efficiency and reliability directly impact operational costs.

Why Does This Matter for AI Infrastructure?

The connection between advanced solar technology and AI data centers is direct and urgent. AI companies are racing to secure reliable, renewable power sources to meet both environmental commitments and the sheer energy demands of training and running large language models. High-efficiency solar cells that can be manufactured at scale could become a critical component of the energy infrastructure supporting AI workloads. By testing tandem cells in the harshest environment imaginable, Qcells is gathering real-world durability data that will accelerate the transition from laboratory success to industrial deployment.

Hanwha Solutions, Qcells' parent organization, is already moving beyond terrestrial applications. Hanwha Solutions and Hanwha Systems are jointly developing high-efficiency solar cell and panel technologies for satellites, with planned in-orbit demonstrations and a pathway toward commercialization in very low Earth orbit (VLEO) by 2028. The companies also plan to expand the technology to other orbital environments, including low Earth orbit (LEO) and medium Earth orbit (MEO). A dedicated space solar development team was formed within the company's technology division in June 2026, with recruitment focused on space materials, satellite design, and space-environment reliability.

How Is Qcells Positioned to Scale This Technology?

Qcells holds nearly 40% of the U.S. residential solar market share and operates a vertically integrated domestic supply chain in Georgia with 8.6 gigawatts of annual manufacturing capacity. This manufacturing expertise, which includes the ability to produce everything from raw silicon ingots to finished modules in a single facility, provides the industrial foundation necessary to transition next-generation tandem solar from laboratory prototypes to large-scale deployment. The company is already deploying this capability on utility-scale projects, including the Reclamation Solar Project in Indiana, built under a power purchase agreement with Meta.

The SSTEF-1 mission represents a rare opportunity to gather data that cannot be obtained any other way. While the mission will return data rather than commercial products, the insights gained about how tandem cells respond to combined space stressors will support the continued development of high-efficiency solar technology for use on Earth, accelerating the timeline for bringing next-generation cells to market at scale.