Large Scale Pattern Graphene Electrode for High Performance in Transparent Organic Single Crystal Field-Effect Transistors

Liu, Wei; Jackson, Biyun Li; Zhu, Jing; Miao, Congqin; Choon-Heui, Chung; Park, Young Ju; Sun, Kang; Woo, J.C.S.; Xie, Ya‐Hong

doi:10.1021/nn100728p

Cited by 124 publications

(86 citation statements)

References 28 publications

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“…[ 3 , 12 ] Several reports have demonstrated organic thin fi lm transistors (OTFT) using CVD-grown graphene as source and drain electrodes. [13][14][15][16][17][18] However, in these studies, fabricating reliable junctions while maintaining clean interface between the channel and electrodes remains as a challenge. Although photolithography with subsequent dry and wet etching processes have been shown to work with graphene, these processes are not compatible with organic devices due to the harsh patterning conditions.…”

Section: Doi: 101002/adma201101570mentioning

confidence: 99%

Inking Elastomeric Stamps with Micro‐Patterned, Single Layer Graphene to Create High‐Performance OFETs

et al. 2011

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Section: Doi: 101002/adma201101570mentioning

confidence: 99%

Inking Elastomeric Stamps with Micro‐Patterned, Single Layer Graphene to Create High‐Performance OFETs

et al. 2011

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“…In addition, planarization of the photonic integrated circuit enables reliable transfer of wafer-scale graphene with a low probability of rupture, or potentially even growth directly on the entire chip. Therefore, the CMOS-processing compatibility of waveguide-integrated graphene photodetectors appears possible in the near term through (1) the use of chemical vapour deposition grown graphene, either transferred or selectively grown on the waveguide chip 27 , and (2) deposition of CMOS-compatible metal to replace gold in the titanium/gold contacts. This waveguide-based graphene photodetector, with the combined advantages of a compact footprint, zero-bias operation and ultrafast responsivity over a broad spectral range, opens the door to high-performance, CMOS-compatible graphene optoelectronic devices in photonic integrated circuits.…”

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confidence: 99%

Chip-integrated ultrafast graphene photodetector with high responsivity

et al. 2013

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Graphene-based photodetectors have attracted strong interest for their exceptional physical properties, which include an ultrafast response 1-3 across a broad spectrum 4 , a strong electronelectron interaction 5 and photocarrier multiplication [6][7][8] . However, the weak optical absorption of graphene 2,3 limits its photoresponsivity. To address this, graphene has been integrated into nanocavities 9 , microcavities 10 and plasmon resonators 11,12 , but these approaches restrict photodetection to narrow bands. Hybrid graphene-quantum dot architectures can greatly improve responsivity 13 , but at the cost of response speed. Here, we demonstrate a waveguide-integrated graphene photodetector that simultaneously exhibits high responsivity, high speed and broad spectral bandwidth. Using a metal-doped graphene junction coupled evanescently to the waveguide, the detector achieves a photoresponsivity exceeding 0.1 A W 21 together with a nearly uniform response between 1,450 and 1,590 nm. Under zero-bias operation, we demonstrate response rates exceeding 20 GHz and an instrumentation-limited 12 Gbit s 21 optical data link.Graphene demonstrates ultrafast carrier dynamics for both electrons and holes, and it has been shown that a weak internal electric field allows high-speed and efficient photocarrier separation 2,3,14 . Moreover, graphene's two-dimensional nature appears to enable the generation of multiple electron-hole pairs for every highenergy photon excitation 6-8 . This carrier multiplication process is equivalent to inherent gain in graphene photodetection, which exists even without external bias, unlike traditional avalanche detection 15 . Despite these attractive features, the low optical absorption in graphene results in low photoresponsivity in vertical-incidence photodetector designs.Recently it has been revealed that coupling graphene to a bus waveguide can enhance light absorption over a broadband spectrum 16,17 . Here, we show that, by integrating a graphene photodetector onto a silicon-on-insulator (SOI) bus waveguide, it is possible to greatly enhance graphene absorption and the corresponding photodetection efficiency without sacrificing the high speed and broad spectral bandwidth. In our device, presented in Fig. 1a, a silicon waveguide is backfilled with SiO 2 and then planarized to provide a smooth surface for the deposition of graphene. A thin SiO 2 layer ( 10 nm) deposited on the planarized chip electrically isolates the graphene layer from the underlying silicon structures. The optical waveguide mode couples to the graphene layer through the evanescent field, leading to optical absorption and the generation of photocarriers. Two metal electrodes located on opposite sides of the waveguide collect the photocurrent. One of these electrodes is positioned 100 nm from the edge of the waveguide to create a lateral metal-doped junction that overlaps with the waveguide mode. The junction is close enough to the waveguide to efficiently separate the photoexcited electron-hole pairs at zero bias, but the meta...

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“…5.5d. In particular, monolayer graphene can also act as the electrode in OFETs and photodetectors [8,[22][23][24]. Cao et al [23] fabricated a new class of high-performance photoresponsive molecular FETs using the Langmuir-Blodgett (L-B) monolayers of copper phthalocyanine (CuPc) and 2D ballistically conductive single-layer graphene as planar contacts (Fig.…”

Section: Transistorsmentioning

confidence: 99%

Application of Graphene-Based Transparent Conductors (TCs)

Zheng

Kim

2015

Graphene for Transparent Conductors

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As graphene has several potential advantages over indium tin oxide (ITO) including weight, robustness , flexibility, chemical stability, and cost, many applications, such as touch panels, displays, solar cells, organic light-emitting diode, transistors and other new areas, have been demonstrated [1]. Although the application of graphene for transparent conductors (TCs) is still in its early stage and the performances of some devices presented in this book are in a preoptimized state, the unique functional characteristics can make graphene a strong candidate to replace the currently commercially dominant TC materials [2]. These devices, with their functional, structural, and mechanical requirements, where graphene has been considered to apply are discussed in this chapter. Touch ScreenA touch screen is an electronic visual display that detects the presence and location of a touch [2]. A variety of touch-screen technologies, such as resistive, surface acoustic wave, capacitive, surface capacitance, projected capacitance, has been developed [3]. The most commonly used touch screens are the resistive and capacitive types, which require a sheet resistance of ~ 300-1500 Ω/sq at a transparency of ~ 86-90 % [4]. Graphene has several advantages including flexibility, wear resistance, chemical durability, and low toxicity (Fig. 5.1a-b) compared to the traditional ITO. Based on the successful fabrication of graphene films, with outstanding sheet resistance and transparency, and a large size of tens of centimeters, Bae et al.[5] incorporated them into touch-screen panel devices (Fig. 5.1b). It is revealed that the touch-screen display made from graphene outperformed that of ITO in terms of the applied strain. The former touch screen could handle twice as much strain as conventional ITO-based devices (Fig. 5.1c) [5]. The graphene-based panel resisted up to 6 % strain, which is limited mainly by the silver electrode and not by graphene itself, while the ITO-based touch panel easily broke at just 2-3 % strain.

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Large Scale Pattern Graphene Electrode for High Performance in Transparent Organic Single Crystal Field-Effect Transistors

Cited by 124 publications

References 28 publications

Inking Elastomeric Stamps with Micro‐Patterned, Single Layer Graphene to Create High‐Performance OFETs

Inking Elastomeric Stamps with Micro‐Patterned, Single Layer Graphene to Create High‐Performance OFETs

Chip-integrated ultrafast graphene photodetector with high responsivity

Application of Graphene-Based Transparent Conductors (TCs)

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