Organic single crystal field-effect transistors: advances and perspectives

Jiang, Lang; Dong, Huanli; Hu, Wenping

doi:10.1039/b925875b

Cited by 155 publications

(80 citation statements)

References 117 publications

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“…1, 2 Within the past decade special emphasis was given to crystalline tetracene (Tc), which has been used as the active semiconductor in developing novel organic electronic devices including ambipolar organic light emitting transistors (OLETs), 3 organic field-effect transistors (OFETs), [4][5][6][7] and organic solar cells (OSCs). 8,9 In order to understand the fundamental electronic properties and their dynamics upon photo-excitation steady state absorption, [10][11][12] emission, 10,[13][14][15][16] photoemission, 17 and transient absorption [18][19][20][21][22][23][24][25] spectroscopy studies on both Tc crystals and Tc polycrystalline thin films have been used.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast dynamics of excitons in tetracene single crystals

Birech

Schwoerer

Schmeiler

et al. 2014

The Journal of Chemical Physics

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Articles you may be interested inUltrafast exciton dynamics in free standing 200 nm thin tetracene single crystals were studied at room temperature by femtosecond transient absorption spectroscopy in the visible spectral range. The complex spectrally overlapping transient absorption traces of single crystals were systematically deconvoluted. From this, the ultrafast dynamics of the ground, excited, and transition states were identified including singlet exciton fission into two triplet excitons. Fission is generated through both, direct fission of higher singlet states S n on a sub-picosecond timescale, and thermally activated fission of the singlet exciton S 1 on a 40 ps timescale. The high energy Davydov component of the S 1 exciton is proposed to undergo fission on a sub-picoseconds timescale. At high density of triplet excitons their mutual annihilation (triplet-triplet annihilation) occurs on a <10 ps timescale.

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Section: Introductionmentioning

confidence: 99%

Ultrafast dynamics of excitons in tetracene single crystals

Birech

Schwoerer

Schmeiler

et al. 2014

The Journal of Chemical Physics

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“…In contrast to thin films, single crystals with perfect molecular order are free of grain boundaries on relevant length scales and ideally suited for the investigation of the intrinsic properties of organic semiconductors to correlate charge transport with respect to molecular arrangement 16,17 . In addition, phase transitions between different polymorphs can be followed by single-crystal X-ray structure analysis [18][19][20][21] .…”

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confidence: 99%

Single-crystal field-effect transistors of new Cl2-NDI polymorph processed by sublimation in air

et al. 2015

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Physical properties of active materials built up from small molecules are dictated by their molecular packing in the solid state. Here we demonstrate for the first time the growth of n-channel single-crystal field-effect transistors and organic thin-film transistors by sublimation of 2,6-dichloro-naphthalene diimide in air. Under these conditions, a new polymorph with two-dimensional brick-wall packing mode (b-phase) is obtained that is distinguished from the previously reported herringbone packing motif obtained from solution (a-phase). We are able to fabricate single-crystal field-effect transistors with electron mobilities in air of up to 8.6 cm 2 V À 1 s À 1 (a-phase) and up to 3.5 cm 2 V À 1 s À 1 (b-phase) on n-octadecyltriethoxysilane-modified substrates. On silicon dioxide, thin-film devices based on b-phase can be manufactured in air giving rise to electron mobilities of 0.37 cm 2 V À 1 s À 1 . The simple crystal and thin-film growth procedures by sublimation under ambient conditions avoid elaborate substrate modifications and costly vacuum equipment-based fabrication steps.

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“…Organic thin films are currently used in fabricating OFETs [310,311], LEDs [312], and photovoltaic organic solar cells (PVOSCs) [313] because of their light weight, flexibility, solubility, low-temperature processing, higher yields, and low cost of production based on various kinds of printing technologies that are especially tailored for large-scale productions [309]. In this context, high purity and low defect density organic single crystals offer an ideal platform [40,43,314,315] for studying structure-performance relationships [316], intrinsic [306] and anisotropic [21] charge carrier transport, and photoconductivities [317,318] that are put to use in device simulations and modeling studies [104,319]. Weak intermolecular interactions in OS make them very different from conventional in OS, as they possess relatively lower melting points and low sublimation temperatures, which make their crystal growth substantially different from those of inorganic semiconductors [308,309].…”

Section: Organic Single Crystalsmentioning

confidence: 99%

“…Knowing that a single-crystal semiconductor is an ideal platform for studying and exploiting the intrinsic charge carrier transport properties, extensive efforts were put in to grow crystalline OS [40][41][42][43] and successive improvements achieved in material crystallinity did show significant improvement in the charge carrier mobility. For example, very low values of the mobilities, measured in earlier samples, in the range of 0.001 to 0.1 cm 2 /Vs [44] were pushed to as high as 20 cm 2 /Vs in crystalline ruberene and pentacene samples at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Organic semiconductors for device applications: current trends and future prospects

Ahmad

2014

Journal of Polymer Engineering

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Abstract:With the rich experience of developing silicon devices over a period of the last six decades, it is easy to assess the suitability of a new material for device applications by examining charge carrier injection, transport, and extraction across a practically realizable architecture; surface passivation; and packaging and reliability issues besides the feasibility of preparing mechanically robust wafer/substrate of single-crystal or polycrystalline/ amorphous thin films. For material preparation, parameters such as purification of constituent materials, crystal growth, and thin-film deposition with minimum defects/ disorders are equally important. Further, it is relevant to know whether conventional semiconductor processes, already known, would be useable directly or would require completely new technologies. Having found a likely candidate after such a screening, it would be necessary to identify a specific area of application against an existing list of materials available with special reference to cost reduction considerations in large-scale production. Various families of organic semiconductors are reviewed here, especially with the objective of using them in niche areas of large-area electronic displays, flexible organic electronics, and organic photovoltaic solar cells. While doing so, it appears feasible to improve mobility and stability by adjusting π-conjugation and modifying the energy bandgap. Higher conductivity nanocomposites, formed by blending with chemically conjugated C-allotropes and metal nanoparticles, open exciting methods of designing flexible contact/interconnects for organic and flexible electronics as can be seen from the discussion included here.

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Organic single crystal field-effect transistors: advances and perspectives

Cited by 155 publications

References 117 publications

Ultrafast dynamics of excitons in tetracene single crystals

Ultrafast dynamics of excitons in tetracene single crystals

Single-crystal field-effect transistors of new Cl2-NDI polymorph processed by sublimation in air

Organic semiconductors for device applications: current trends and future prospects

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