Molecular-Reductant-Induced Control of a Graphene–Organic Interface for Electron Injection
Molecular-Reductant-Induced Control of a Graphene–Organic Interface for Electron Injection
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DOI：
10.1021/acs.chemmater.9b00566
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发表时间：
2019-03
影响因子：
8.6
通讯作者：
Fengyu Zhang;Chen Klein;E. Longhi;S. Barlow;S. Marder;G. Sarusi;A. Kahn
中科院分区：
文献类型：
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作者：
Fengyu Zhang;Chen Klein;E. Longhi;S. Barlow;S. Marder;G. Sarusi;A. Kahn
用氧化还原活性分子对石墨烯进行表面掺杂是调节其电性能的有效方法，特别是用作透明电极。在这里，我们提出了分子还原剂（五甲基环戊二烯基）（1,3,5-三甲基苯）钌二聚体（[RuCp*Mes]2）对石墨烯表面n掺杂的研究和应用。光电发射光谱和载流子传输测量相结合，研究掺杂引起的石墨烯和苯基二（芘基）氧化膦（POPy2）之间界面电子结构的变化，POPy2是一种低电子亲和力材料，已被用作有机发光二极管中的电子传输层（ETL）。光电发射和霍尔电压测量证实了石墨烯的 n 掺杂。掺杂 1–2 nm 的 [RuCp*Mes]2 可使石墨烯功函数降低 1.8 eV，电子注入势垒降低超过 1 eV，从而将电子注入 POPy2 增强几个数量级。石墨烯/POPy2/Al二极管...
Surface doping of graphene with redox-active molecules is an effective approach to tune its electrical properties, in particular for application as transparent electrodes. Here we present a study and application of surface n-doping of graphene with the molecular reductant (pentamethylcyclopentadienyl)(1,3,5-trimethylbenzene)ruthenium dimer ([RuCp*Mes]2). Photoemission spectroscopy and carrier-transport measurements are combined to investigate doping-induced changes in the electronic structure of the interface between graphene and phenyldi(pyren-2-yl)phosphine oxide (POPy2), which is a low-electron-affinity material that has been used as an electron-transport layer (ETL) in organic light-emitting diodes. Photoemission and Hall voltage measurements confirm the n-doping of graphene. Doping with 1–2 nm of [RuCp*Mes]2 reduces the graphene work function by 1.8 eV and the electron injection barrier by more than 1 eV, enhancing electron injection into POPy2 by several orders of magnitude. Graphene/POPy2/Al diodes...