Figure 1
From: Broadband energy transfer to sensitizing dyes by mobile quantum dot mediators in solar cells
Proposed mechanism (left) and expected spectra (right) for broadband energy transfer via.
(a) Föster resonance energy transfer (FRET), where the QDs transfer the energy to the dye due to a strong resonant frequency (indicated by the overlap between the absorption of the dye and the emission of the QD). (b) Co–sensitization, where the QD helps the dye co–absorb photons in a different range and then activates the redox regeneration, thus accelerating the generated electrons to the TiO2. (c) Two–photon absorption, where the QD is capable of simultaneously absorbing high (Vis–range) and low (IR–range) photon energies, thus inducing energy transfer to the dye via resonance. These contributions increase and broaden the overall external quantum efficiency (EQE).
