Switzerland

When it comes to gravity batteries, pumped-hydro storage is the gold standard, but its cost and topography-specific limitations are driving innovations ranging from freight-train braking to super-dense liquids. We consider whether any of the new technologies can punch above their weight.

Long-duration energy storage (LDES) is essential for decarbonizing the grid but gigawatt-hour scale systems continue to be tricky for companies with big ideas. Here are some of the latest innovations across a flourishing array of new – and old – ideas.

European researchers have looked at how zinc phosphide could be used in solar cell development and found that monocrystalline thin films might perform better than polycrystalline films in electrical devices. They also determined that the performance of such films is directly correlated to the zinc/phosphide ratio.

The Bern University of Applied Sciences in Switzerland has published the initial results of a survey on the durability and performance of residential PV inverters and power optimizers over a 15-year period. They found that more than 65% of the inverters did not present yield-relevant faults by their 15th year of operation.

Swiss scientists have used a minimal amount of silver to alloy the absorber in a thin-film CIGS solar cell. They say this process could help to improve efficiency, open-circuit voltage, and fill factor, while compensating for the low bandgap of the CIGS layer.

Scientists in Switzerland and South Korea looked deep into the crystalline structure of a perovskite thin-film to better understand the mechanisms behind the sensitivity to heat and moisture that causes so many stability issues for solar cells based on these materials. They discovered a part of the crystal’s surface that is particularly vulnerable to moisture-induced degradation, and developed an approach to grow perovskite thin-films with strong resistance to moisture and thermal stress.

With energy certification already a must-have for any business which makes green energy claims, Ed Everson, chief executive of England-based, global certification company Evident, makes the case for firms to be required to make full disclosure of their energy sources.

Switzerland has announced a new one-off incentive model for solar, in order to reimburse up to 60% of investment costs for installations that meet certain criteria. The scheme exists in addition to nonrecurring remunerations for small and large PV installations.

Swiss startup Sun-Ways has developed a patented solution under which it directly rolls out solar modules between railway tracks like a carpet. The panels can be removed at any time for maintenance work.

Chemical engineers in Switzerland have invented a solar-powered artificial leaf. Their solar-powered, transparent and porous electrode turns water from its gaseous state in the air into hydrogen fuel.