Solar’s silver problem is moving from the lab to the Atacama desert

PV Magazine reports that Chilean company Atamostec is testing low-silver heterojunction, or HJT, solar modules at the Atacama Desert Solar Platform. This is not a clean-room showcase dressed up as field work. It is a trial in one of the harshest natural solar test environments available: the Atacama Desert, described in the project context as the world’s sunniest region.

The core of the story is ALPACA, a research project evaluating how much silver in HJT modules can be replaced with copper. According to the supplied brief, the project has so far reached up to 70% silver substitution. That number matters because silver in photovoltaics is not a cosmetic material. It is a conductive input tied directly to module cost, supply-chain exposure and the economics of scaling production. Copper is cheaper and more abundant, and in Chile it also fits the country’s industrial base.

The work is being carried out with France’s CEA-Ines, the National Solar Energy Institute, and the French Alternative Energies and Atomic Energy Commission, CEA. That partnership is a useful signal of where the solar industry is heading. Cell efficiency still matters, but the next hard contest is whether high-efficiency designs can be manufactured with fewer expensive or critical inputs.

Heterojunction modules combine crystalline silicon with thin amorphous silicon layers to reduce losses and lift cell performance. The architecture can be highly competitive, but one industrial detail often decides whether a technology can scale: how much costly metal must be printed into every cell and module. That is why replacing silver with copper is not a side issue. It goes straight to production cost, material risk and the long-term sustainability of photovoltaic deployment.

The Atacama is an unforgiving but useful proving ground. High irradiance, dry conditions and real temperature cycling expose weaknesses faster than a tidy lab campaign. If modules with a new metallization approach can keep performing there, the case for industrial validation becomes much stronger. The supplied project brief makes that point directly: validating the advance under real-world Atacama conditions is key to accelerating industry adoption.

There is also a local industrial-policy angle. ALPACA is described as a public-private initiative supported by Chile’s government-run Production Development Corporation, CORFO. If the project works, Chile is not just a country with exceptional sunlight and copper reserves. It becomes a place where a lower-silver route for next-generation solar manufacturing is tested against real operating stress.

The next questions are practical rather than theatrical. First, whether the silver-to-copper substitution remains stable through longer outdoor exposure. Second, whether the process can move from a research project to commercial production without hidden reliability penalties. In solar hardware, the meaningful breakthrough is not the one that looks neat in a briefing. It is the one that survives dust, heat, ultraviolet exposure and years of output.