Researchers at the University of California, Santa Barbara have developed a molecule that can store solar energy for weeks and release it as heat when needed, according to a study published in the journal Joule on May 15, 2026.
The molecule, called a 'photoswitch,' absorbs sunlight and holds the energy in a stable chemical form. When triggered by a small amount of heat or light, it reverts to its original shape, releasing stored energy as heat. This could allow solar power to be used at night or on cloudy days without traditional batteries.
Lead author Dr. Emily Chen said the molecule can store energy for up to 10 weeks with minimal loss. The team tested it over 100 charge-discharge cycles with no degradation. The technology is still in early stages, with practical applications years away.
The research was funded by the U.S. Department of Energy and the National Science Foundation. The next step is to integrate the molecule into materials like films or fibers for use in heating buildings or charging devices.
