A breakthrough in renewable energy technology could soon allow solar panels to generate electricity not just from sunlight—but also from raindrops.
Scientists at the Institute of Materials Science of Seville (ICMS), a joint centre of the Spanish National Research Council and the University of Seville, have developed a novel hybrid device that combines solar and rain energy harvesting into a single thin-film system.
A Dual-Powered Energy Breakthrough
At the heart of the innovation is a patented ultra-thin coating that enhances the performance and durability of perovskite solar cells—an emerging alternative to traditional silicon-based photovoltaics. What sets this development apart is its ability to simultaneously convert sunlight and raindrop impact into usable electricity.
The thin film not only protects the sensitive perovskite material from environmental degradation but also integrates triboelectric properties—enabling it to generate electricity through the mechanical impact of falling raindrops.
Laboratory tests show that a single raindrop can produce up to 110 volts, enough to power small electronic devices such as sensors or LED circuits.
Solving a Key Weakness of Perovskite Solar Cells
Perovskite solar cells are widely regarded as a promising next-generation solar technology due to their high efficiency and lower manufacturing costs. However, their vulnerability to moisture and temperature fluctuations has limited large-scale deployment.
To address this, the ICMS team applied a plasma-deposited protective coating just 100 nanometres thick. This layer shields the material chemically, improves light absorption, and maintains stability even under extreme conditions—including full water immersion.
Powering Devices—Rain or Shine
Unlike conventional solar panels that lose efficiency during cloudy or rainy conditions, this hybrid system ensures continuous energy generation regardless of weather.
Researchers say the technology could play a critical role in powering Internet of Things (IoT) devices, especially in remote or off-grid environments. Potential applications include environmental monitoring systems, smart agriculture tools, weather stations, and infrastructure sensors for bridges and buildings.
The innovation could also support smart city infrastructure—such as autonomous lighting, digital signage, and real-time monitoring systems—where reliable, weather-resilient energy sources are essential.
Enabling Self-Sustaining Outdoor Systems
The research, published in the journal Nano Energy, outlines a new approach to building durable, self-powered electronic systems designed for outdoor use. By combining photovoltaic and triboelectric energy harvesting in a single device, the technology opens the door to more resilient and decentralized energy solutions.
Backed by funding from the European Research Council and Next Generation EU programmes, the project represents a significant step toward scalable, sustainable energy harvesting systems.
As climate variability increases and the demand for decentralized energy systems grows, innovations like hybrid solar-rain panels could redefine how clean energy is generated and used. By tapping into multiple natural resources simultaneously, such systems offer a pathway toward more reliable and adaptive renewable energy infrastructure.
Reference : https://doi.org/10.1016/j.nanoen.2025.111678