Park Dae Young, Suh Hyeong Chan, Bang Seungho, Lee Ju Chan, Yoo Jaekak, Ko Hayoung, Choi Soo Ho, Kim Ki Kang, Lee Seung Mi, Lim Seong Chu, Nahm Tschang-Uh, Jeong Mun Seok
Department of Physics, Hanyang University, Seoul 04763, Republic of Korea.
Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Nanoscale. 2024 Jun 6;16(22):10779-10788. doi: 10.1039/d4nr00061g.
The properties of transition metal dichalcogenides (TMDCs) are critically dependent on the dielectric constant of substrates, which significantly limits their application. To address this issue, we used a perfluorinated polyether (PFPE) self-assembled monolayer (SAM) with low surface energy to increase the van der Waals (vdW) gap between TMDCs and the substrate, thereby reducing the interaction between them. This resulted in a reduction in the subthreshold swing value, an increase in the photoluminescence intensity of excitons, and a decrease in the doping effect by the substrate. This work will provide a new way to control the TMDC/dielectric interface and contribute to expanding the applicability of TMDCs.
过渡金属二硫属化物（TMDCs）的性质严重依赖于衬底的介电常数，这极大地限制了它们的应用。为了解决这个问题，我们使用了具有低表面能的全氟聚醚（PFPE）自组装单分子层（SAM）来增加TMDCs与衬底之间的范德华（vdW）间隙，从而减少它们之间的相互作用。这导致亚阈值摆幅值降低，激子的光致发光强度增加，以及衬底的掺杂效应减小。这项工作将为控制TMDC/电介质界面提供一种新方法，并有助于扩大TMDCs的适用性。
