jz1c01411_si_001.pdf (1.04 MB)
Download fileGenerating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS2
journal contribution
posted on 2021-05-28, 20:36 authored by Sourav Maiti, Deepika Poonia, Pieter Schiettecatte, Zeger Hens, Pieter Geiregat, Sachin Kinge, Laurens D.A. SiebbelesWe studied the dynamics
of transfer of photoexcited electronic
states in a bilayer of the two-dimensional transition metal dichalcogenide
ReS2 and tetracene, with the aim to produce triplets in
the latter. This material combination was used as the band gap of
ReS2 (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 ReS2 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.
