Hierarchical Interaction of Polymer Crystals on Two Dimensional Transition Metal Dichalogenide Nanosheets
Abstract
This proposal aims to investigate the multi-scale structural interactions of polymers on transition metal dichalcogenides (TMDs), single crystalline organic semiconductors and thus understand molecule-to-molecule and crystal lattice-to-lattice interaction between polymer crystals with hierarchical structures and single or polycrystalline TMDs and organic crystals for further controlling resulting nanostructures of polymer crystals for potential photo-electric applications. First of all, crystallization of a polymer on a single crystalline organic semiconductor, Rubrene was systematically investigated as a function of a variety of controlling factors such as crystallization rate and thickness of the polymer. The results demonstrate that the characteristic crystal-to-crystal interaction was developed between a host organic single crystal and a guest crystalline polymer, resulting in an intriguing nanostructures where highly aligned polymer lamellae were achieved. The epitaxy of polymer crystals was extended onto a variety of crystals including graphene and TMD and the results clearly show that crystal-to-crystal interaction occurred on all of the surfaces, giving rise to polymer crystals globally ordered with the specific crystal orientations dictated by the epitaxial relation between polymer and a host crystal. We also investigated the supramolecular assembly of end-functionalized polymers, in particular, with pre-patterned guidance for developing globally controlled polymer nanostructures. The study enables us to develop functional periodic nano and micron-scale structures of the polymer crystals which will allow us to extensively characterize their photo-electric properties and thus make them suitable for high performance applications. Vertical-type p-n photodetectors with self-assembled TMD nanosheets were fabricated with excellent photo-switching behavior.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 2019
- Accession Number
- AD1077165
Entities
People
- Cheolmin Park
Organizations
- Yonsei University