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Atomically thin epitaxial template for organic crystal growth using graphene with controlled surface wettability
Nguyen Ngan Nguyen1, Sae Byeok Jo1, Seong Kyu Lee1
1Department of Chemical Engineering Pohang University of Science and Technology Pohang 790-784 Korea.
Nano Letters
|March 24, 2015
Summary
Researchers developed a clean graphene template for organic semiconductor growth. This template allows control over molecular orientation and morphology, paving the way for improved organic electronic devices.
Area of Science:
- Materials Science
- Surface Science
- Organic Electronics
Background:
- Organic semiconductors require precise control over their growth and morphology for optimal device performance.
- Existing methods for preparing substrates for organic semiconductor growth often involve complex or residue-inducing transfer processes.
Purpose of the Study:
- To develop a novel, clean, and versatile two-dimensional epitaxial growth template for organic semiconductors.
- To investigate the influence of graphene templates on the growth mode, molecular orientation, and properties of organic semiconductors.
- To explore the tunability of organic semiconductor morphology through substrate engineering and graphene integration.
Main Methods:
- Development of a sacrificial graphene layer method for crack-free, residue-free transfer of monolayer graphene onto various substrates.
- Utilizing graphene-templated substrates with controlled surface wettability for organic semiconductor growth.
- Characterization of organic semiconductor morphology, molecular orientation, and optical properties (e.g., exciton diffusion in pentacene).
- Systematic investigation of graphene layer effects on organic semiconductor-substrate interactions.
Main Results:
- Achieved quasi-epitaxial growth of crystalline organic semiconductors with lying-down molecular orientation on clean graphene templates.
- Demonstrated "wetting transparency" of graphene, allowing substrate interactions to influence organic semiconductor growth.
- Observed a clear transition in organic semiconductor growth mode (lateral to vertical) dependent on substrate hydrophobicity.
- Established a strong correlation between morphology evolution, substrate interaction, and optical properties of pentacene layers.
Conclusions:
- The developed clean graphene template enables precise control over organic semiconductor growth and morphology.
- Graphene's unique properties facilitate the engineering of molecular-substrate interactions for tailored semiconductor layer formation.
- This approach offers a convenient and effective strategy for optimizing organic semiconductor morphologies in electronic devices.
