DataVXACS Applied Electronic MaterialsPaper
journal article·2020-09-22

Experimental Observation of Ultrahigh Mobility Anisotropy of Organic Semiconductors in the Two-Dimensional Limit

Xin Xu, Jingsi Qiao, Beilei Sun, Li Tao, Yu Zhao, Minchao Qin, Xinhui Lu, Wei Ji, Zefeng Chen, Jianbin Xu

ACS Applied Electronic Materials· Volume 2· Issue 9
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Source abstract

Abstract

Charge transport properties near the interface of organic material are one of the most fundamental research fronts of organic transistors. Although carrier mobility has been well studied in bulk single crystal organic semiconductors based on field effect transistors, the experimental result of mobility anisotropy is far from the theoretical one because of crystal cracks, step edge states, and other surface state issues. Here, highly ordered and molecularly thin N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C13) is adopted to study the anisotropic transport property. We find that the PTCDI-C13 film with monomolecular thickness exhibits a high mobility anisotropy ratio up to ∼28 at room temperature, which is highly consistent with the theoretical result and is 10 times higher than previously reported results of bulk single-crystal organic semiconductors. The carrier transport behavior in the single layer is attributed to the hopping mechanism with an activation energy kBT0 ≈ 33.6 meV. Our results corroborate the intrinsic charge transport properties of electroactive organic layered materials at the interfaces.
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Research context

Electronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Thin-Film Transistor Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, P. R. China

Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing 100872, China

Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China

Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, P. R. China

Funding

Research Grants Council, University Grants Committee · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Renmin University of China · Innovation and Technology Commission · National Natural Science Foundation of China · Chinese University of Hong Kong · Chinese Academy of Sciences

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