journal article·2015-03-18

High Performance of Low Band Gap Polymer-Based Ambipolar Transistor Using Single-Layer Graphene Electrodes

Jong Yong Choi, Woonggi Kang, Boseok Kang, Wonsuk Cha, Seon Kyoung Son, Youngwoon Yoon, Hyunjung Kim, Youngjong Kang, Min Jae Ko, Hae Jung Son, Kilwon Cho, Jeong Ho Cho, BongSoo Kim

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Abstract

Bottom-contact bottom-gate organic field-effect transistors (OFETs) are fabricated using a low band gap pDTTDPP-DT polymer as a channel material and single-layer graphene (SLG) or Au source/drain electrodes. The SLG-based ambipolar OFETs significantly outperform the Au-based ambipolar OFETs, and thermal annealing effectively improves the carrier mobilities of the pDTTDPP-DT films. The difference is attributed to the following facts: (i) the thermally annealed pDTTDPP-DT chains on the SLG assume more crystalline features with an edge-on orientation as compared to the polymer chains on the Au, (ii) the morphological features of the thermally annealed pDTTDPP-DT films on the SLG electrodes are closer to the features of those on the gate dielectric layer, and (iii) the SLG electrode provides a flatter, more hydrophobic surface that is favorable for the polymer crystallization than the Au. In addition, the preferred carrier transport in each electrode-based OFET is associated with the HOMO/LUMO alignment relative to the Fermi level of the employed electrode. All of these experimental results consistently explain why the carrier mobilities of the SLG-based OFET are more than 10 times higher than those of the Au-based OTFT. This work demonstrates the strong dependence of ambipolar carrier transport on the source/drain electrode and annealing temperature.
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Research context

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

Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Hwarangno14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea

Department of Chemistry, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea

SKKU Advanced Institute of Nanotechnology (SAINT), School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan, Suwon-si, Gyeonggi-do 440-746, Republic of Korea

Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Gyeong-buk 790-784, Republic of Korea

Department of Physics, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 121-742, Republic of Korea

Green School (School of Energy and Environment), Korea University, 1, Anam-dong 5-ga, Seongbuk-gu, Seoul 136-701, Republic of Korea

Nanomaterials Science and Engineering, Korea University of Science & Technology, Daejeon 305-350, Republic of Korea

Department of Science Education, Ewha Womans University, Seoul 120-750, Republic of Korea

Funding

National Research Foundation of Korea · Ministry of Trade, Industry and Energy · Korea Institute of Science and Technology · Small and Medium Business Administration · Ministry of Science, ICT and Future Planning

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