Recent experiments have shown that the efficiency of photoinduced electron transfer from sensitizers (molecules or quantum dots) to semiconductors can be enhanced by coupling the sensitizers to plasmon resonances in metal nanoparticles. Here, we use a model-Hamiltonian approach to show theoretically that there is an optimal coupling between the sensitizer and plasmons that maximizes the electron-transfer efficiency. This optimum results from the competition between electron transfer, plasmon relaxation, and plasmon decoherence. For coupling values that exceed the optimal value, the dynamics of electron transfer from the sensitizer to the semiconductor can be significantly modified due to the sensitizer-plasmon coupling.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films