It's the only one I know of applying standard semiconductor wafer techniques. If it works out, I think this one (https://spectrum.ieee.org/energywise/energy/en

It's the only one I know of applying standard semiconductor wafer techniques. If it works out, I think this one (https://spectrum.ieee.org/energywise/energy/environment/a-glass-battery-that-keeps-getting-better https://spectrum.ieee.org/energywise/energy/environment/a-gl...) is a more promising battery technology in the long run due to lifespan. It appears to be far more preliminary at this point however.