Journal ArticleDOI
Atomically thin epitaxial template for organic crystal growth using graphene with controlled surface wettability.
Nguyen Ngan Nguyen,Sae Byeok Jo,Seong Kyu Lee,Dong Hun Sin,Boseok Kang,Hyun Ho Kim,Hansol Lee,Kilwon Cho +7 more
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TLDR
The combination of a clean graphene surface and a suitable underlying substrate could serve as an atomically thin growth template to engineer the interaction between organic molecules and aromatic graphene network, thereby paving the way for effectively and conveniently tuning the semiconductor layer morphologies in devices prepared using graphene.Abstract:
A two-dimensional epitaxial growth template for organic semiconductors was developed using a new method for transferring clean graphene sheets onto a substrate with controlled surface wettability. The introduction of a sacrificial graphene layer between a patterned polymeric supporting layer and a monolayer graphene sheet enabled the crack-free and residue-free transfer of free-standing monolayer graphene onto arbitrary substrates. The clean graphene template clearly induced the quasi-epitaxial growth of crystalline organic semiconductors with lying-down molecular orientation while maintaining the "wetting transparency", which allowed the transmission of the interaction between organic molecules and the underlying substrate. Consequently, the growth mode and corresponding morphology of the organic semiconductors on graphene templates exhibited distinctive dependence on the substrate hydrophobicity with clear transition from lateral to vertical growth mode on hydrophilic substrates, which originated from the high surface energy of the exposed crystallographic planes of the organic semiconductors on graphene. The optical properties of the pentacene layer, especially the diffusion of the exciton, also showed a strong dependency on the corresponding morphological evolution. Furthermore, the effect of pentacene-substrate interaction was systematically investigated by gradually increasing the number of graphene layers. These results suggested that the combination of a clean graphene surface and a suitable underlying substrate could serve as an atomically thin growth template to engineer the interaction between organic molecules and aromatic graphene network, thereby paving the way for effectively and conveniently tuning the semiconductor layer morphologies in devices prepared using graphene.read more
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2D Organic Materials for Optoelectronic Applications
Fangxu Yang,Shanshan Cheng,Xiaotao Zhang,Xiaochen Ren,Rongjin Li,Huanli Dong,Wenping Hu,Wenping Hu +7 more
TL;DR: Herein, the applications of organic 2D materials for optoelectronic devices are a main focus and an introduction to what is known and suggestions for the potential of many exciting developments are presented.
Journal ArticleDOI
On the Mechanism of Hydrophilicity of Graphene.
Guo Hong,Yang Han,Thomas M. Schutzius,Yuming Wang,Ying Pan,Ming Hu,Jiansheng Jie,Chander Shekhar Sharma,U. Müller,Dimos Poulikakos +9 more
TL;DR: It is shown that the intrinsic hydrophilicity of graphene can be intimately connected to the position of its Fermi level, which affects the interaction between graphene and water molecules.
Journal ArticleDOI
Graphene and its derivatives as versatile templates for materials synthesis and functional applications
TL;DR: Recent progress on graphene and its derivatives as versatile templates for materials synthesis is demonstrated, particularly highlighting the basic fundamental roles of graphene in the materials preparation process.
Journal ArticleDOI
Graphene–organic hybrid electronics
Chang-Hyun Kim,Ioannis Kymissis +1 more
TL;DR: In this paper, the authors review fundamental aspects and recent advances in emerging devices, and project their perspectives on their future, and regard hybrid electronics from organic semiconductors and graphene as a distinct subject of research that may open up many new possibilities.
Journal ArticleDOI
Boosting Photon Harvesting in Organic Solar Cells with Highly Oriented Molecular Crystals via Graphene-Organic Heterointerface.
Sae Byeok Jo,Hyun Ho Kim,Hansol Lee,Boseok Kang,Seong Kyu Lee,Myungsun Sim,Min Kim,Wi Hyoung Lee,Kilwon Cho +8 more
TL;DR: The present findings indicate that controlling organic-graphene heterointerface could provide a design strategy of organic solar cell architecture for boosting photon harvesting and show a 5 times increment in the maximum power conversion efficiency than the equivalent devices without a graphene layer.
References
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Journal ArticleDOI
Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene
TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
Journal ArticleDOI
Raman spectrum of graphene and graphene layers.
Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
TL;DR: This work shows that graphene's electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers, and allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.
Journal ArticleDOI
Graphene: Status and Prospects
TL;DR: This review analyzes recent trends in graphene research and applications, and attempts to identify future directions in which the field is likely to develop.
Journal ArticleDOI
Large-scale pattern growth of graphene films for stretchable transparent electrodes
Keun Soo Kim,Yue Zhao,Houk Jang,Sang Yoon Lee,Jong Min Kim,Kwang S. Kim,Jong Hyun Ahn,Philip Kim,Philip Kim,Jae-Young Choi,Byung Hee Hong +10 more
TL;DR: The direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers is reported, and two different methods of patterning the films and transferring them to arbitrary substrates are presented, implying that the quality of graphene grown by chemical vapours is as high as mechanically cleaved graphene.
Journal ArticleDOI
Roll-to-roll production of 30-inch graphene films for transparent electrodes
Sukang Bae,Hyeongkeun Kim,Youngbin Lee,Xiangfan Xu,Jaesung Park,Yi Zheng,Jayakumar Balakrishnan,Tian Lei,Hye Ri Kim,Young Il Song,Young Jin Kim,Kwang S. Kim,Barbaros Özyilmaz,Jong Hyun Ahn,Byung Hee Hong,Sumio Iijima,Sumio Iijima +16 more
TL;DR: The roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates are reported, showing high quality and sheet resistances superior to commercial transparent electrodes such as indium tin oxides.
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