122nd General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code PHYS.P-199
Subject Formation and Photophysical Behavior of Two-Dimensional PTCDA Film (perylene-3,4,9,10-tetracarboxylic dianhydride) on Graphene
Authors Dogyeong Kim, Sunmin Ryu*
Department of Chemistry, Pohang University of Science and Technology, Korea
Abstract Two-dimensional van der Waals (2D vdW) heterostructures have recently gained much research interest due to their unusual properties and new phenomena. Despite their potential both in fundamental research and application, organic-inorganic 2D vdW heterostructures have not been under systematic spectroscopic investigation. In this work, PTCDA/graphene heterostructures were generated by self-limited assembly of organic vapors at elevated temperatures. Topographic details and photophysical properties of the heterostructures were studied by atomic force microscopy, micro-Raman, photoluminescence (PL) and reflectance spectroscopy. PL spectra exhibited significant progression with increasing thickness of PTCDA and their intensity was greatly quenched on metallic graphene. The quenching of strong PL signals revealed vibrational Raman features of PTCDA clearly on graphene. Absorption peaks identified from the reflectance measurements were attributed to molecular S0-S1 transition, charge-transfer exciton and an unknown origin. The topographic and spectroscopic features will be discussed regarding their dependence on the thickness of PTCDA and graphene substrates.
E-mail rlaehrud12@Postech.ac.kr