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20 August 2020 Sensitization of silicon by singlet exciton fission in tetracene
Tony C. Wu, Markus Einzinger, Julia Kompalla, Hannah Smith, Collin Perkinson, Leas Nienhaus, Sarah Wieghold, Daniel Congreve, Nicholas Thompson, Antoine Kahn, Moungi Bawendi, Marc A. Baldo
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Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 1146416 (2020) https://doi.org/10.1117/12.2567365
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
Singlet fission can split a high energy singlet exciton and generate two lower energy triplet excitons. This process has shown near 200 percent triplet exciton yield. Sensitizing solar cells with singlet fission material, it can potentially increase the power conversion efficiency limit from 29 percent to 35 percent. Singlet fission in the tetracene is known to be efficient, and the energy of the triplet excitons are energetically matched to the silicon bandgap. In this work, we designed an optical measurement with an external magnetic field to determine the efficiencies of triplet exciton transfer from tetracene to silicon. Using this method, we have found that a passivation layer of 8 angstroms of hafnium oxynitride on silicon allows efficient triplet exciton transfer around 133 percent.
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Tony C. Wu, Markus Einzinger, Julia Kompalla, Hannah Smith, Collin Perkinson, Leas Nienhaus, Sarah Wieghold, Daniel Congreve, Nicholas Thompson, Antoine Kahn, Moungi Bawendi, and Marc A. Baldo "Sensitization of silicon by singlet exciton fission in tetracene", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 1146416 (20 August 2020); https://doi.org/10.1117/12.2567365
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KEYWORDS
Excitons
Silicon
Magnetism
Luminescence
Solar energy
Solar cells
Absorption
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