Effect of In Situ Annealing Treatment on the Mobility and Morphology of TIPS-Pentacene-Based Organic Field-Effect Transistors

Fang, Yang; Wang, Xiaolin; Fan, Hongwei; Tang, Ying; Jian-jun, Yang; Yu, Junsheng

doi:10.1186/s11671-017-2238-y

Cited by 7 publications

(5 citation statements)

References 40 publications

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“…This suggestion agrees with the assignment of the spectral red shifts observed here (SI, Section S2) as an accumulation of excitons at low-energy defect sites such as those at grain boundaries. A significant proportion of TIPS-Pn thin-film systems reported in the literature are polycrystalline in nature, ,,,− and may therefore experience this phenomenon. Additionally, even for films that achieve large-scale crystalline alignment, the relative orientation of these slip-stacking directions to the device architecture must also be considered.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic Triplet Exciton Diffusion in Crystalline Functionalized Pentacene

2020

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Exciton multiplication through singlet fission (SF) offers scope for next-generation photovoltaic devices to exceed the Shockley–Queisser limit. Organic SF chromophores typically exhibit significant structural anisotropy in their crystal packing, which can impact exciton transport and influence the design of SF-enhanced devices. An improved understanding of the link between structural anisotropy and exciton diffusion is therefore crucial for developing SF-based photovoltaics. Here, we use femtosecond transient absorption spectroscopy to quantify the anisotropic triplet mobility in 6,13-(triisopropylsilylethynyl)pentacene (TIPS-Pn), a prototypical SF chromophore. Bimolecular triplet–triplet annihilation (TTA) in crystalline TIPS-Pn is well-described by a kinetic model that assumes isotropic, three-dimensional triplet exciton diffusion, but with best-fit parameters that do not correspond to any physical parameters of the material. Kinetic models that assume either one-dimensional or anisotropic three-dimensional exciton diffusion describe the annihilation equally well but yield more physically realistic fit parameters, suggesting that triplet diffusion on the subnanosecond time scale occurs mostly along a single axis of the material. These findings highlight the need to treat parameters obtained from fits of experimental data with models of isotropic diffusion with caution for systems with anisotropic packing such as TIPS-Pn. Diffusion coefficients calculated by density functional theory predict that triplet exciton diffusion occurs predominantly along the crystallographic a-axis, with migration in any other direction through the crystal slower by over an order of magnitude. This anisotropic diffusion suggests that fast, directional exciton transport in layers or films of TIPS-Pn may be achieved by control of the chromophore morphology.

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Section: Resultsmentioning

confidence: 99%

Anisotropic Triplet Exciton Diffusion in Crystalline Functionalized Pentacene

2020

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“…Small structural change in active organic molecule leads alteration in thin‐film morphology and optoelectronic properties of active organic material. The processing condition of active organic layer also affects the morphology and crystallization of organic layer which affects the transport and retention of charge carriers . π‐Conjugated triazole derivatives were used to fabricate organic memory devices .…”

Section: Resultsmentioning

confidence: 99%

“…The processing condition of active organic layer also affects the morphology and crystallization of organic layer which affects the transport and retention of charge carriers. [4,67] π-Conjugated triazole derivatives were used to fabricate organic memory devices. [30] The triazole derivatives have shown distinct thin-film morphology which leads to different memory characteristics such as dynamic random access memory (DRAM), write once read many times (WORM) and flash memory with different V set / V reset voltages.…”

Section: Comparative Analysis Of Different Organic-switching Layer-ba...mentioning

confidence: 99%

“…Organic electronics is one of the emerging field of advanced electronics. [1,2,3,4] Organic material offers molecular structuredependent optoelectronic properties with low-cost fabrication, high scalability and novel self-assembly properties over inorganic materials. [5,6] From the past few decades, several applications of organic material-based electronic devices have been developed by worldwide researchers such as light-emitting diodes, [7] flexible electronic displays, [8] sensors [9] and solar cell devices.…”

Section: Introductionmentioning

confidence: 99%

“…Organic electronics is one of the emerging field of advanced electronics . Organic material offers molecular structure‐dependent optoelectronic properties with low‐cost fabrication, high scalability and novel self‐assembly properties over inorganic materials .…”

Section: Introductionmentioning

confidence: 99%

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Benzoselenadiazole‐Based Conjugated Molecules: Active Switching Layers with Nanofibrous Morphology for Nonvolatile Organic Resistive Memory Devices

Jadhav

Kumar

et al. 2020

ChemPlusChem

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In this work, two symmetrical donor-acceptor-donor (D-A-D) type benzoselenadiazole (BSeD)-based π-conjugated molecules were synthesized and employed as an active switching layer for non-volatile data storage applications. BSeD-based derivatives with different donor units attached through common vinylene linkers showed different electrical and optical properties. 4,7-Di ((E)-styryl)benzo[c][2,1,3]selenadiazole (DSBSeD) and 4,7-bis((E)-4-methoxystyryl)benzo[c][2,1,3]selenadiazole (DMBSeD) are sandwiched between gallium-doped ZnO (GZO) and metal aluminum electrodes respectively through solution-processed spin-coating method. The solution-processed nanofibrous switching layer containing the DMBSeD-based memory device showed reliable memory characteristics in terms of write and erase operations with low SET voltage than the randomaggregated DSBSeD-based device. The nanofibrous molecular morphology of switching layer overcomes the interfacial hole transport energy barrier at the interface of the DMBSeD thinfilm and the bottom GZO electrode. The memory device GZO/ DMBSeD/Al based on nanofibrous switching layers shows switching characteristics at compliance current of 10 mA with V set = 0.79 V and V reset = À 0.55 V. This work will be beneficial for the rational design of advanced next-generation organic memory devices by controlling the nanostructured morphology of active organic switching layer for enhanced charge-transfer phenomenon.[a] R.

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Small‐Molecule‐Based Organic Field‐Effect Transistor for Nonvolatile Memory and Artificial Synapse

Ling

et al. 2019

Adv Funct Materials

231

200

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With the incorporation of tailorable organic electronic materials as channel and storage materials, organic field‐effect transistor (OFET)‐based memory has become one of the most promising data storage technologies for hosting a variety of emerging memory applications, such as sensory memory, storage memory, and neuromorphic computing. Here, the recent state‐of‐the‐art progresses in the use of small molecules for OFET nonvolatile memory and artificial synapses are comprehensively reviewed, focusing on the characteristic features of small molecules in versatile functional roles (channel, storage, modifier, and dopant). Techniques for optimizing the storage capacity, speed, and reliability of nonvolatile memory devices are addressed in detail. Insight into the use of small molecules in artificial synapses constructed on OFET memory is also obtained in this emerging field. Finally, the strategies of molecular design for improving memory performance in view of small molecules as storage mediums are discussed systematically, and challenges are addressed to shed light on the future development of this vital research field.

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Effect of In Situ Annealing Treatment on the Mobility and Morphology of TIPS-Pentacene-Based Organic Field-Effect Transistors

Cited by 7 publications

References 40 publications

Anisotropic Triplet Exciton Diffusion in Crystalline Functionalized Pentacene

Anisotropic Triplet Exciton Diffusion in Crystalline Functionalized Pentacene

Benzoselenadiazole‐Based Conjugated Molecules: Active Switching Layers with Nanofibrous Morphology for Nonvolatile Organic Resistive Memory Devices

Small‐Molecule‐Based Organic Field‐Effect Transistor for Nonvolatile Memory and Artificial Synapse

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