Sensitization of silicon by singlet exciton fission in tetracene

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 perc...

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Bibliographic Details
Main Authors: Wu, Tony C, Einzinger, Markus, Kompalla, Julia, Smith, Hannah L., Perkinson, Collin Fisher, Nienhaus, Lea, Wieghold, Sarah, Congreve, Daniel Norbert, Thompson, Nicholas J., Kahn, Antoine, Bawendi, Moungi G, Baldo, Marc A
Other Authors: Massachusetts Institute of Technology. Research Laboratory of Electronics
Format: Article
Language:English
Published: Society of Photo-Optical Instrumentation Engineers (SPIE) 2021
Online Access:https://hdl.handle.net/1721.1/129729
Description
Summary: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.