Cambridge scientists observe molecular vibrations acting as catapults to achieve record breaking electron transfer speeds

Cambridge scientists found that molecular vibrations can fire electrons in 18 femtoseconds, creating a new rulebook for ultra-efficient solar energy harvesting.

By: AXL Media

Published: Mar 5, 2026, 9:56 AM EST

Source: The information in this article was sourced from St. John's College, University of Cambridge

Challenging conventional theories of charge transfer

For decades, the scientific community believed that ultrafast charge transfer in solar energy systems required significant energy differences between materials and strong electronic coupling. However, these requirements often limited overall voltage and increased energy loss. A team led by Dr. Pratyush Ghosh at St. John’s College, Cambridge, deliberately designed a system with minimal energy offset and weak interaction—conditions that conventional theory suggested would result in slow charge movement. Contrary to these expectations, the researchers observed a ballistic burst of energy that defies traditional design rules.

The femtosecond scale of atomic motion

Using ultrafast laser measurements, the team captured events lasting only 18 femtoseconds. To put this into perspective, a single second contains more femtoseconds than the number of hours that have passed since the birth of the universe. At this almost inconceivable speed, the researchers were able to watch electrons migrate on the same chronological scale as the vibrating atoms themselves. This observation confirms that charge separation can occur within the span of a single molecular vibration, effectively moving as fast as the laws of physics allow.

Molecular vibrations as directional catapults

The study reveals that instead of being a hindrance, specific high frequency molecular vibrations act as a "catapult" for electrons. When light strikes the material, it creates an exciton—a tightly bound pair of an electron and a hole. To generate electricity, this pair must split. The Cambridge team found that the polymer's vibrations mix electronic states and "kick" the electron across the material boundary. This movement is directional and coherent rather than a slow, random drift, ensuring that less energy is lost during the conversion process.