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Updated: Apr 18, 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
Achieving the photon up-conversion thermodynamic yield upper limit by sensitized triplet-triplet annihilation
S Hoseinkhani1, R Tubino, F Meinardi
1Dipartimento di Scienza dei Materiali, Università of Milano-Bicocca, via Cozzi 55, I-20125 Milano, Italy. angelo.monguzzi@mater.unimib.it.
Abstract:
Triplet-triplet annihilation (TTA) based up-conversion is a promising strategy for light harvesting the low-energy tail of the solar spectrum with photovoltaic technologies. Here, we present a bi-component system for photon managing via TTA that allows bypassing the classical statistic limit of 2/5 in the singlet generation, achieving a near unitary conversion efficiency. This result is obtained because of the peculiar relative position of the triplet and singlet energy levels of perylene, used as up-converter and emitter. The system shows a record red-to-blue external up-conversion yield of ∼10% under an irradiance of 1 sun.
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