Photon upconversion under diffusion-free conditions: Breaking the Shockley-Queisser limit for solar energy devices
The major losses in present day solar cells stem from a mismatch between the solar spectrum and the bandgap of the cells used, i.e. an inability to make good use of both low energy and high energy photons. Here we propose a strategy for productive use of a larger part of the solar spectrum by tuning the photon energies to the requirements of specific solar energy conversion materials, using supramolecular constructs. We will develop molecular complexes that sustain intramolecular photon upconversion through triplet-triplet annihilation, i.e. a system capable of efficient upconversion in solid state without diffusion. This is a very challenging project but it has the potential to change the solar energy arena since the technology could increase the efficiency of any solar energy technology.
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- Swedish Energy Agency (Public, Sweden)