Photovoltaic panels at the Travers Solar Farm in Alberta, Canada. Photo: Kkiefuik, via Wikimedia Commons, CC BY 4.0. Every solar panel is fighting a quiet battle inside its materials. The better a semiconductor is at absorbing sunlight, the faster the electrical charges it creates tend to disappear before they can be collected. A study led by the University of Oxford and published in Nature on October 28, 2026 shows that this trade-off is not a law of nature. In a material called bismuth sul...