Hi, this is Kate from MinuteEarth Solar panels pretty much only come in one color: opaque This is because they use dark sheets of silicon crystals to absorb the sun's rays, which then transform Them to electric power And solar panels are becoming very cheap and very efficient, and soon it could be in all cities Working on sunshine … except for areas that are almost sun perceptible in side cities Buildings, which are usually designed to let light in We could stick solar panels all over the sides of the buildings, but that would be bleak For people who are inside However, there may be other ways: Scientists recently invented a solar panel that looks like Resemble a window In fact, it is a window, except that it is embedded in a thin layer of small silicone It is a particle called quantum dots that absorb some of the short wavelengths that are cited Light, while letting the rest pass through.
The points then re-emit energy in longer waves, which bounce off the length of a window Platen glass, instead of escaping – due to something physics called total internal reflection. Because quantum dots absorb only shorter wavelengths, those waves that emit again travel Through the platen glass without being reabsorbed by other points. When it reaches an edge, it strikes the tiny solar cells that turn it into electricity Because these solar windows capture some light, it's not 100% transparent, but in reality, Neither are skyscraper windows natural – they are usually coated with reflective materials To keep some of the sun's energy out.
But solar windows aren't as efficient as typical solar panels, the engineers are They're still working on some technical glitches, so I've made very optimistic estimates on transparent quantum dots Solar windows at least several years to be out of service The more you implement, you may not even notice – because you will be looking sound Through them This video is sponsored by the University of Minnesota, where students and faculty are Staff in all fields of study work to solve the major challenges facing society. In the Department of Mechanical Engineering, Professor Uwe Korchagen and graduate students Samantha Hill has made a quantum leap in this field by creating silicon nanoparticles And incorporating them into clear sheets could work on solar windows in the future Thanks, University of Minnesota! .