Atomically Smooth Graphene-Based Hybrid Template for the Epitaxial Growth of Organic Semiconductor Crystals |
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Authors: | Nguyen Ngan Nguyen Hyo Chan Lee Kangkyun Baek Min Seok Yoo Hansol Lee Hyungsub Lim Shinyoung Choi Cheol-Joo Kim SungWoo Nam Kilwon Cho |
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Affiliation: | 1. Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673 Republic of Korea;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana – Champaign, Urbana, IL, 61801 USA;3. Center for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang, 37673 Republic of Korea;4. Department of Mechanical Science and Engineering/Department of Materials Science and Engineering, University of Illinois at Urbana – Champaign, Urbana, IL, 61801 USA |
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Abstract: | Atomically thin 2D materials are good templates to grow organic semiconductor thin films with desirable features. However, the 2D materials typically exhibit surface roughness and spatial charge inhomogeneity due to nonuniform doping, which can affect the uniform assembly of organic thin films on the 2D materials. A hybrid template is presented for preparation of highly crystalline small-molecule organic semiconductor thin film that is fabricated by transferring graphene onto a highly ordered self-assembled monolayer. This hybrid graphene template has low surface roughness and spatially uniform doping, and it yields highly crystalline fullerene thin films with grain sizes >300 nm, which is the largest reported grain size for C60 thin films on 2D materials. A graphene/fullerene/pentacene phototransistor fabricated directly on the hybrid template has five times higher photoresponsivity than a phototransistor fabricated on a conventional graphene template supported by a SiO2 wafer. |
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Keywords: | C60 graphene growth templates organic optoelectronics organic semiconductors |
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