Atomically Smooth Graphene‐Based Hybrid Template for the Epitaxial Growth of Organic Semiconductor Crystals
Atomically Smooth Graphene‐Based Hybrid Template for the Epitaxial Growth of Organic Semiconductor Crystals
复制标题
DOI：
10.1002/adfm.202008813
复制
发表时间：
2020-12
影响因子：
19
通讯作者：
N. Nguyen;H. Lee;Kangkyun Baek;Min Seok Yoo;Hansol Lee;Hyungsub Lim;Shinyoung Choi;Cheol‐Joo Kim;Sungwoo Nam;Kilwon Cho
中科院分区：
文献类型：
--
作者：
N. Nguyen;H. Lee;Kangkyun Baek;Min Seok Yoo;Hansol Lee;Hyungsub Lim;Shinyoung Choi;Cheol‐Joo Kim;Sungwoo Nam;Kilwon Cho
原子级薄的2D材料是生长具有期望特征的有机半导体薄膜的良好模板。然而，由于不均匀掺杂，2D材料通常表现出表面粗糙度和空间电荷不均匀性，这会影响有机薄膜在2D材料上的均匀组装。提出了一种用于制备高度结晶的小分子有机半导体薄膜的混合模板，其通过将石墨烯转移到高度有序的自组装单层上来制造。该混合石墨烯模板具有低表面粗糙度和空间均匀掺杂，并且其产生具有晶粒尺寸>300 nm的高度结晶富勒烯薄膜，这是2D材料上的C60薄膜的最大报道晶粒尺寸。直接在混合模板上制造的石墨烯/富勒烯/并五苯光电晶体管具有比在由SiO2晶片支撑的常规石墨烯模板上制造的光电晶体管高五倍的光响应度。
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.