Single Molecule's Quantum Trick Could Boost Waste Heat Harvesting

The quest for flexible, low-cost devices that can harvest waste heat is pushing scientists to the nanoscale. Organic thermoelectrics are promising candidates, but the complex behaviour of their electrons has made them difficult to model and optimise.

A new study focuses on a single organic magnetic molecule, BDPA, placed between two gold electrodes. Using a novel theoretical framework that combines first-principles calculations with advanced modelling, researchers have unlocked its secrets. They discovered that the BDPA molecule maintains an unpaired electron, which gives rise to a quantum phenomenon known as the Kondo resonance. Near a specific energy point, this resonance causes sharp peaks in both electrical and thermal conductivity.

Crucially, the team showed that by adjusting the molecule's energy levels, its thermoelectric efficiency can be significantly enhanced. This detailed theoretical insight provides a powerful methodology for designing high-performance, molecule-sized energy converters.