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Authors:
Bartlam, Cian; Saigal, Nihit; Heiserer, Stefan; Lambers, Hendrik; Wurstbauer, Ursula; Duesberg, Georg S. 
Document type:
Zeitschriftenartikel / Journal Article 
Title:
Orientation Dependent Interlayer Coupling in Organic–Inorganic Heterostructures 
Journal:
Advanced Functional Materials 
Volume:
34 
Issue:
28 
Year:
2024 
Pages from - to:
2315302 
Language:
Englisch 
Keywords:
charge transfer ; heterostructures ; interlayer excitons ; MoS2 ; perylene ; photoluminescence ; self-assembly ; 2D materials 
Abstract:
Organic–inorganic 2D heterostructures combine the high optical absorption of organic molecules with exciton-dominated optical properties in layered transition metal dichalcogenides (TMDs) such as MoS2. Critical to the interaction and the optical response in such hybrid systems is the electronic band alignment at the interface between the two species. Here, the coupling of monolayers of perylene derivatives is investigated with bilayer MoS2. In particular, variation in the perylene orientation on the MoS2 surface is identified using Raman spectroscopy and scanning probe microscopy. Low-temperature optical spectroscopy reveals orientation-dependent interlayer exciton formation. Furthermore, power-dependent photoluminescence measurements provide insight into the modified interlayer charge transfer in these heterostructures. A saturation of interlayer states is found under high excitation power when the perylene molecules are in a perpendicular orientation to the surface that leads to electron accumulation in the MoS2, whereas parallel alignment of the perylene molecules leads to enhanced populations of organic–inorganic interlayer excitons. This work provides insights into the optimization of organic–inorganic heterostructures, with particular relevance to applications for optoelectronic and excitonic devices. 
ISSN:
1616-301X ; 1616-3028 
Article ID:
2315302 
Department:
Fakultät für Elektrotechnik und Informationstechnik 
Institute:
EIT 2 - Institut für Physik 
Chair:
Düsberg, Georg 
Project:
Graphene Flagship ; SSLiP ; 2D-PRINTABLE ; VITAL-SENSE 
Open Access yes or no?:
Ja / Yes 
Type of OA license:
CC BY-NC-ND 4.0