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Updated: Feb 12, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Cascade sensitization of triplet-triplet annihilation based photon upconversion at sub-solar irradiance
Jacopo Pedrini1, Angelo Monguzzi, Francesco Meinardi
1Università degli Studi di Milano-Bicocca, Dipartimento di Scienza dei Materiali, via Cozzi 55, 20125 Milano, Italy. angelo.monguzzi@unimib.it.
Abstract:
In triplet-triplet annihilation based upconversion, high-energy photons are generated through the annihilation of fluorophore triplets, populated via energy transfer from a light-harvesting sensitizer. However, the absorption band of common sensitizers is narrow, limiting the fraction of recoverable photons. We overcome this issue using a third chromophore as an additional light-harvester in the transparency window between the upconverted luminescence and the sensitizer absorption. The third component transfers the extra-collected energy to sensitizers, realizing a cascade-sensitized upconversion that shows a 20% increment of the high-energy photon output and a conversion yield of 10% at solar irradiance.
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