Session: 17-15-01: Society-Wide Micro/Nano Poster Forum

Paper Number: 100058

100058 - Monolayer Mose2/p3ht Hybrid Crystals for High-Performance Photoelectric Devices 

The synergic interactions in organic-inorganic hybrid structures present various intriguing electronic and optoelectronic effects. They usually have fast charge carrier transportation and separation on the organic-inorganic interfaces, as such, facilitate rapid photoresponse and effective photon-electron energy conversion. Therefore, the hybrid structures find a breadth of applications in sensing, energy harvesting, and many other areas. In line with this trend, early investigations have proved that 2D material-polymer hybrid structures can thoroughly alter the intrinsic 2D material properties, and produce outstanding optoelectronic properties, high flexibility, lightweight, adjustable molecular orientation, and many more, thanks to the synergic interactions with polymers. On the other hand, previous methods for hybrid structure fabrication, including solution mixing, ultrasonication assisted assembly, and others, face a common problem of inaccurate control over the 2D material-polymer hybrid structures. Therefore, most of the studies discussed the properties of assemblies consisting of various microscale structures, which not only hinder the application potential of them but also impede the understanding of fundamental physical/chemical processes. The main reason is that, hitherto, we still lack a powerful means to control the assembly of 2D materials and polymers. To achieve a fundamental understanding of the structure-property relationship, it will be important to isolate one piece of 2D materials and build such hybrids, while chemically and mechanically exfoliated 2D flakes with enriched defects and large size variation may not be an ideal choice.

Thanks to the progress of wafer-scale 2D material synthesis, we now have the opportunity to break the above limitation and fabricate scalable 2D material-polymer hybrid structures with uniform interface configuration. Here, we employed chemical vapor deposition (CVD) to synthesize a monolayer MoSe2 (m-MoSe2) single crystal which is then used as an ultra-thin 2D template to achieve the epitaxial assembly of polymer nanocrystal (i.e., poly(3-hexylthiophene-2,5-diyl) (P3HT)) for constructing a prime unit (m-MoSe2-P3HT). This prime unit is essentially a new type of hybrid crystal containing only one monolayer 2D materials with induced polymer crystals on top. With the strategy of epitaxial crystallization, the highly ordered assembly of polymer on 2D materials, which is pivotal establishes a type-II heterojunction at the interface and shows strong interaction across the crystalline interface as evidenced by the photoluminescence and photoconductivity characterization. Moreover, such interaction facilitates the charge transfer across the interface and significantly promotes the photo response of the hybrid. Our study creates a new platform to study the inorganic-organic interaction for an unlimited combination of 2D materials-organic materials system and paves the way towards highly controlled and high-performance hybrid materials and systems.

Presenting Author: Mingyuan Sun Villanova University

Presenting Author Biography: My name is Mingyuan Sun and my research is focusing on the 2D materials and polymers-based hybrid nanostructure system.

Authors:

Mingyuan Sun Villanova University
Zhou Dong Villanova University
Ningxin Li Georgia State University
Sidong Lei Georgia State University
Bo Li Villanova University