Breakthrough in Solar Energy Efficiency by Cambridge Researchers
Cambridge, Friday, 3 October 2025.
Cambridge scientists developed an organic molecule enhancing solar energy conversion, potentially transforming renewable energy technologies and reducing fossil fuel dependency.
Innovative Organic Molecule P3TTM
The University of Cambridge announced a pioneering development on October 1, 2025, involving an organic molecule known as P3TTM, which marks a significant step forward in solar energy technology. Researchers Professors Hugo Bronstein and Sir Richard Friend have discovered Mott-Hubbard physics in this organic radical semiconductor molecule. This advancement simplifies the design of solar panels, making them lighter and more cost-effective, while entirely organic [5].
Efficiency and Potential of P3TTM
The P3TTM molecule introduces a novel approach wherein the organic molecule absorbs energy from sunlight, activating an electron to a higher state. The proximity of molecules in a thin film allows for spontaneous electron transfer to a neighboring molecule, creating a charge separation beneficial for energy conversion. Tests have shown nearly 100% efficiency in converting light to electrical charge in controlled conditions [1]. However, the molecule primarily absorbs light at 400 nm (UV/blue) and slightly at 645 nm (red), which limits its absorption spectrum [1].
Implications for Renewable Energy
While P3TTM’s absorption range currently limits its application for widespread solar energy harvesting, its ability to facilitate single-material solar cells presents a transformative potential for the solar industry. This could lead to a reduction in manufacturing complexity and cost, potentially boosting the efficiency and longevity of organic photovoltaic devices [1][5]. The breakthrough aligns with global sustainability goals, offering a promising avenue for reducing reliance on fossil fuels and enhancing renewable energy technologies [2].
Future Prospects and Challenges
Despite its promise, significant challenges remain before P3TTM can be implemented on a commercial scale. The current focus is on optimizing the efficiency and stability of molecules like P3TTM for practical applications, including energy-generating windows and urban landscapes with power-producing surfaces. Researchers are also exploring the integration of AI in materials discovery to accelerate development cycles for energy solutions [5].