Maiti Sourav, Poonia Deepika, Schiettecatte Pieter, Hens Zeger, Geiregat Pieter, Kinge Sachin, Siebbeles Laurens D A
Optoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, Delft 2629 HZ, The Netherlands.
Physics and Chemistry of Nanostructures, Ghent University, Ghent, Belgium.
J Phys Chem Lett. 2021 Jun 10;12(22):5256-5260. doi: 10.1021/acs.jpclett.1c01411. Epub 2021 May 28.
We studied the dynamics of transfer of photoexcited electronic states in a bilayer of the two-dimensional transition metal dichalcogenide ReS and tetracene, with the aim to produce triplets in the latter. This material combination was used as the band gap of ReS (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 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.
我们研究了二维过渡金属二硫属化物ReS和并四苯双层中光激发电子态的转移动力学，目的是在后一种材料中产生三重态。使用这种材料组合是因为ReS的带隙（1.5电子伏特）略大于并四苯的三重态能量（1.25电子伏特）。通过时间分辨光吸收光谱法，发现光激发态从ReS转移到并四苯中的三重态在5皮秒内发生，效率接近38%。这一结果为二维材料与合适有机物的异质结构设计开辟了新的可能性，以产生长寿命的三重态。三重态作为敏化剂在包括光电子学、光伏、光催化和光子上转换在内的各种应用中具有重要意义。
