South Korea has introduced the world's first invisible solar panels, with scientists achieving a breakthrough in photovoltaic cell technology that allows light to pass through in a way invisible to the naked eye. This innovation redefines urban power supply and the use of solar panels around buildings, paving the way for future transparent, power-generating glass.
The breakthrough was led by a research team at the Ulsan National Institute of Science and Technology (UNIST), with collaboration from Incheon National University. It is based on “All-Back-Contact (ABC)” transparent crystalline silicon (c-Si) solar cell technology, where all electrical contacts are placed on the back of the cell. By eliminating front-side metal lines, the surface becomes smoother, allowing light to pass through while capturing ultraviolet and infrared wavelengths. Many invisible panels use environmentally friendly semiconductors titanium dioxide (TiO₂) and nickel oxide (NiO), with the former absorbing ultraviolet light and the latter enhancing transparency.
Testing showed that a 16-square-centimeter transparent solar panel achieved an energy conversion efficiency of up to 14.7%, making it one of the highest-power transparent solar modules. Even powerful versions can charge a smartphone using only sunlight.
Previously, adopting solar panels faced challenges such as requiring large spaces or modifying windows. Korean researchers built on an early concept of fully transparent solar generators with only 1% efficiency, creating solar panels that balance visual clarity and performance. The next step is commercialization.
This innovation offers power generation opportunities for smartphones, vehicles, office windows, and more. While early transparent solar panels had niche effects, these new panels are moving toward large-scale commercialization, with applications spanning the automotive industry, high-rise buildings, and tech products. UNIST researchers also explored seamless modular concepts, enabling fully transparent solar panels to connect without visible seams, improving aesthetics and scalability.
Transparent solar panels hold enormous promise and potential for clean energy production, marking the beginning of a scientific victory and reshaping the direction of the solar industry. Achieving sustainability no longer requires drastic design changes—solar panels can be embedded inside buildings rather than on rooftops. UNIST Professor Kwanyong Seo stated: “Transparent panels solve the aesthetic issue and can be effectively utilized in the real world, applicable to homes, cities, and various electronic devices. The electricity generated by transparent glass is over 1,000 times greater than traditional panels, and attention is shifting toward transparent glass.” The field of transparent solar panels continues to evolve, increasingly emerging as an aesthetically pleasing and clean energy solution. The future of sustainable development may be glimpsed through these transparent panels.
