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Solar
Glass that generates
Could 3D-printed solar windows be the next big materials story? By Lioz Etgar and Shlomo Magdassi
Solar power is having its moment: costs have fallen, performance has improved, and deployment is rising across the world. Yet, for all this success, one limitation still shapes what solar can do – physical space. Rooftops fill quickly, many roofs are unsuitable, and in dense cities the most sunlit surfaces like windows, glass façades, and curved building skins, are often the ones solar cannot easily use.
That is what makes a new semitransparent, flexible solar‘ window’ so compelling. It is not just another attempt to push efficiency a little higher, but a totally different way of thinking about solar as a material – something that can be designed into the built environment from the start, rather than retrofitted as a separate object.
If it scales, it could turn large areas of the building envelope into power-generating surfaces without asking architects to tolerate dark panels or compromised design.
Structural solutions
The materials idea behind this work is surprisingly intuitive once explained. Solar cells make electricity by absorbing light. If you want them to be transparent, you normally must let more light pass through, which often means weakening the device efficiency. Many‘ transparent solar’ approaches solve this by changing the solar layer itself, adjusting chemistry, or patterning the active area, but those choices can carry trade-offs in performance, stability, or manufacturing complexity.
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