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arXiv · 2104.15095

Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS$_2$

Sourav Maiti·Deepika Poonia·Pieter Schiettecatte·Zeger Hens·Pieter Geiregat·Sachin Kinge·Laurens D. A. Siebbeles
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Abstract

We studied the dynamics of transfer of photoexcited electronic states in a bilayer of the two-dimensional transition metal dichalcogenide ReS$_2$ and tetracene, with the aim to produce triplets in the latter. This material combination was used as the band gap of ReS$_2$ (1.5 eV) is slightly larger than the triplet energy of tetracene (1.25 eV). Using time-resolved optical absorption spectroscopy, transfer of photoexcited states from ReS$_2$ to triplet states in tetracene was found to occur within 5 ps with an efficiency near 38%. This result opens up new possibilities for heterostructure design of two-dimensional materials with suitable organics to produce long-lived triplets. Triplets are of interest as sensitizers in a wide variety of applications including optoelectronics, photovoltaics, photocatalysis, and photon upconversion.

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Sourav Maiti, Deepika Poonia, Pieter Schiettecatte, Zeger Hens, Pieter Geiregat, Sachin Kinge, Laurens D. A. Siebbeles. 2021-04-30. Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS$_2$. https://arxiv.org/abs/2104.15095

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