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Wow, that is pretty, pretty impressive. henry, look, i want to turn back to solarfor a second. perovskite is the material you ve been working on. what is it, how does it work, and why is it such an improvement and such a possibility for the revolution of solar power? perovskite is a crystal structure. one of the unique aspects of them is because they re composed of three different ions, we can actually change the composition of these ions and that changes the optical properties and electronic properties of this material. this means instead of using a single material to absorb the sunlight, we can actually tune the perovskite to absorb in different regions and stack these materials on top of each other. now, this stacking of solar cells on top of each other we call multi junctions, and the simplest mult junction is a tandem cell, two solar cells on top of each other. and the perovskite we tune ....

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