Researchers at Hebrew University have developed semi-transparent solar cells that can change color and control light transmission using 3D-printed polymer structures. The team, led by Prof. Shlomo Magdassi and Prof. Lioz Etgar from the Institute of Chemistry and the Center for Nanoscience and Nanotechnology, published their findings in the journal EES Solar.
The solar cells use microscopic polymer pillars created through 3D printing to regulate light transmission without modifying the solar material itself. This manufacturing approach avoids high temperatures and toxic solvents, making it suitable for flexible surfaces and more environmentally friendly production. “Our goal was to rethink how transparency is achieved in solar cells,” said Prof. Magdassi. “By using 3D-printed polymer structures made from non-toxic, solvent-free materials, we can precisely control how light moves through the device in a way that is scalable and practical for real-world use.”
The researchers demonstrated that the solar cells’ color can be adjusted by changing the thickness of a transparent electrode layer. This modification allows the device to reflect specific wavelengths of light, creating different colors while maintaining electricity generation. The technology is designed for applications including solar windows and building-integrated photovoltaics.
In laboratory testing, the flexible solar cells achieved power conversion efficiencies of up to 9.2% with approximately 35% average visible transparency. The devices maintained stable performance during repeated bending tests and extended operation periods. “What’s especially exciting is that we can customize both how the device looks and how flexible it is, without sacrificing performance,” said Prof. Etgar. “That makes this technology particularly relevant for solar windows and for adding solar functionality to existing buildings.”
The research team plans to focus on improving long-term durability through protective encapsulation and barrier layers as next steps toward commercial application. The technology could enable solar cell integration into windows, building facades, and curved surfaces where traditional panels cannot be used.
Source: pubs.rsc.org