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"We ascribe this to the diffusion of gold from the back contact into the CdTe layer forming micro-shunts along the grain boundaries," the team said. To address that issue"a new back contact architecture to be developed to realize the true potential of these cells for spaceflight." It's encouraging to think a new, more efficient and long-lasting photovoltaic material usable for collecting solar energy in space has been found, but there's still the matter of getting all of that energy back to Earth.from a satellite to Earth's surface for the first time over the summer in the form of microwaves, but it was more of a proof-of-concept able to light up a couple LEDs than any useful amount of energy.