Change in Tetracene Polymorphism Facilitates Triplet Transfer in Singlet Fission-Sensitized Silicon Solar Cells
Benjamin Daiber (AMOLF Institute for Atomic and Molecular Physics)
Sourav Maiti (TU Delft - ChemE/Opto-electronic Materials)
Silvia M. Ferro (AMOLF Institute for Atomic and Molecular Physics)
Joris Bodin (AMOLF Institute for Atomic and Molecular Physics)
Alyssa F.J. van den Boom (Wageningen University & Research)
Stefan L. Luxembourg (TNO)
Sachin Kinge (Toyota Motor Europe)
Sidharam P. Pujari (Wageningen University & Research)
Laurens D.A. Siebbeles (TU Delft - ChemE/Opto-electronic Materials)
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Abstract
Singlet fission in tetracene generates two triplet excitons per absorbed photon. If these triplet excitons can be effectively transferred into silicon (Si), then additional photocurrent can be generated from photons above the bandgap of Si. This could alleviate the thermalization loss and increase the efficiency of conventional Si solar cells. Here, we show that a change in the polymorphism of tetracene deposited on Si due to air exposure facilitates triplet transfer from tetracene into Si. Magnetic field-dependent photocurrent measurements confirm that triplet excitons contribute to the photocurrent. The decay of tetracene delayed photoluminescence was used to determine a transfer efficiency of ∼36% into Si. Our study suggests that control over the morphology of tetracene during the deposition will be of great importance to boost the triplet transfer yield further.
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