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

TL;DR

This study demonstrates rapid and efficient transfer of photoexcited states from ReS$_2$ to tetracene, enabling triplet generation in organic semiconductors for advanced optoelectronic applications.

Contribution

It introduces a novel heterostructure of ReS$_2$ and tetracene that efficiently produces triplets via photoexcitation transfer within 5 ps.

Findings

Transfer of photoexcited states occurs within 5 ps.

Transfer efficiency is approximately 38%.

Potential for designing 2D heterostructures for triplet generation.

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.