Yazar "Yumusak, Cigdem" seçeneğine göre listele

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    1,7-diazaperylene in Organic Field Effect Transistors
    (Wiley-V C H Verlag Gmbh, 2022) Yumusak, Cigdem; Mayr, Felix; Wielend, Dominik; Kahraman, Bilge; Kanbur, Yasin; Langhals, Heinz; Irimia-Vladu, Mihai
    A thorough material characterization of 1,7-diazaperylene via multiple investigation techniques (cyclic voltammetry, photoluminescence, photoluminescence excitation, impedance spectroscopy) was performed to understand its applicability in organic electronic devices. The recorded data of this perylene derivative was placed in conjunction with the respective data of the parent perylene molecule, and the behavior of this novel compound in organic electronic devices (planar diodes and field effect transistors explained). Although no photovoltaic effect behavior was recorded in planar diodes where 1,7-diazaperylene was employed both as a donor as well as an acceptor, the perylene derivatives proves functional as dielectric layer in organic field effect transistors.
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    High temperature-stability of organic thin-film transistors based on quinacridone pigments
    (Elsevier Science Bv, 2019) Kanbur, Yasin; Coskun, Halime; Glowacki, Eric Daniel; Irimia-Vladu, Mihai; Sariciftci, Niyazi Serdar; Yumusak, Cigdem
    Robust organic thin-film transistors (OTFTs) with high temperature stability allow device integration with mass production methods like thermoforming and injection molding, and enable operation in extreme environment applications. Herein we elaborate a series of materials to make suitable gate dielectric and active semiconductor layers for high temperature stable OTFTs. We employ an anodized aluminum oxide layer passivated with cross-linked low-density polyethylene (LD-PE) to form a temperature-stable gate capacitor. As the semiconductor, we use quinacridone, an industrial organic colorant pigment produced on a mass scale. Evaporated MoOx/Ag source and drain electrodes complete the devices. Here we evaluate the performance of the OTFTs healing them in air from 100 degrees C in 25 degrees C increments up to 225 degrees C, holding each temperature for a period of 30 minutes. We find large differences in stability between quinacridone and its dimethylated derivative, with the former showing the best performance with only a factor of 2 decline in mobility after healing at 225 degrees C, and unaffected on/off ratio and threshold voltage. The approach presented here shows how industriallys calable fabrication of thermally robust OTFTs can be rationalized.
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    Kraft Lignin: From Pulping Waste to Bio-Based Dielectric Polymer for Organic Field-Effect Transistors
    (Wiley-V C H Verlag Gmbh, 2022) D'Orsi, Rosarita; Irimia, Cristian Vlad; Lucejko, Jeannette J.; Kahraman, Bilge; Kanbur, Yasin; Yumusak, Cigdem; Bednorz, Mateusz
    Lignin is an abundant biopolymer deriving from industrial pulping processes of lignocellulosic biomass. Despite the huge amount of yearly produced lignin waste, it finds scarce application as a fine material and is usually destined to be combusted in thermochemical plants to feed, with low efficiency, other industrial processes. So far, the use of lignin in materials science is limited by the scarce knowledge of its molecular structure and properties, depending also on its isolation method. However, lignin represents an intriguing feedstock of organic material. Here, the structural and chemical-physical characteristics of two kraft lignins, L1 and L2, are analyzed. First, several molecular characterization techniques, such as attenuated total reflectance Fourier transform infrared spectroscopy, elemental analyses, gel permeation chromatography, evolved gas analysis-mass spectrometry, UV-vis,P- 31- and C-13- nuclear magnetic resonance spectroscopies are applied to get insights into their different structures and their degree of molecular degradation. Then, their efficient application as gate dielectric materials is demonstrated for organic field-effect transistors, finding the increased capacity of L1 with respect to L2 in triggering functional and efficient devices with both p-type and n-type organic semiconductor molecules.
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    N,N?-Substituted quinacridones for organic electronic device applications
    (Royal Soc Chemistry, 2023) Saadi, Donia; Mayr, Felix; Yumusak, Cigdem; Wielend, Dominik; Cobet, Munise; Kahraman, Bilge; Irimia, Cristian Vlad
    N,N '-Substituted quinacridones are a novel class of commercially available quinacridones for organic electronics which are reported here. In this study, we performed in-depth investigations of the material properties of these molecules i.e. their optical and charge transport properties, infrared-active vibrations (FTIR), electrochemical reduction and oxidation properties, thin film forming and processability, and finally performance in organic field effect transistor devices. We show that substitution plays a critical role in the charge transport properties, with methyl substituted amine being the most favorable, followed by di-phenyl and finally di-butyl.
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    N,N?-Substituted quinacridones for organic electronic device applications (vol 4, pg 2214, 2023)
    (Royal Soc Chemistry, 2024) Saadi, Donia; Mayr, Felix; Yumusak, Cigdem; Wielend, Dominik; Cobet, Munise; Kahraman, Bilge; Irimia, Cristian Vlad
    Correction for 'N,N ' -Substituted quinacridones for organic electronic device applications' by Donia Saadi et al., Mater. Adv., 2023, 4, 2214-2225, https://doi.org/10.1039/D2MA01010K.
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    Pinaceae Fir Resins as Natural Dielectrics for Low Voltage Operating, Hysteresis-Free Organic Field Effect Transistors
    (Wiley-V C H Verlag Gmbh, 2022) Ivic, Jelena; Petritz, Andreas; Irimia, Cristian Vlad; Kahraman, Bilge; Kanbur, Yasin; Bednorz, Mateusz; Yumusak, Cigdem
    Natural dielectrics are emerging nowadays as a niche selection of materials for applications targeting biocompatibility and biodegradability for electronics and sensors within the overall effort of scientific community to achieve sustainable development and to build environmental consciousness. The two natural resins analyzed in this study, silver fir and Rocky mountain fir demonstrate robust dielectric properties and excellent film forming capabilities, while being trap free dielectrics in high-performance organic field effect transistors (OFETs) operating at voltages as low as 1 V. Immense research possibilities are demonstrated through the avenue of inorganic nanofillers insertions in the natural resins film, that opens the door for fabrication of very low voltage OFETs with high dielectric constant insulating layers.
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    Stability of Selected Hydrogen Bonded Semiconductors in Organic Electronic Devices
    (Amer Chemical Soc, 2019) Irimia-Vladu, Mihai; Kanbur, Yasin; Camaioni, Fausta; Coppola, Maria Elisabetta; Yumusak, Cigdem; Irimia, Cristian Vlad; Vlad, Angela
    The electronics era is flourishing and morphing itself into Internet of Everything, IoE. At the same time, questions arise on the issue of electronic materials employed: especially their natural availability and low-cost fabrication, their functional stability in devices, and finally their desired biodegradation at the end of their life cycle. Hydrogen bonded pigments and natural dyes like indigo, anthraquinone and acridone are not only biodegradable and of bio-origin but also have functionality robustness and offer versatility in designing electronics and sensors components. With this Perspective, we intend to coalesce all the scattered reports on the above-mentioned classes of hydrogen bonded semiconductors, spanning across several disciplines and many active research groups. The article will comprise both published and unpublished results, on stability during aging, upon electrical, chemical and thermal stress, and will finish with an outlook section related to biological degradation and biological stability of selected hydrogen bonded molecules employed as semiconductors in organic electronic devices. We demonstrate that when the purity, the long-range order and the strength of chemical bonds, are considered, then the Hydrogen bonded organic semiconductors are the privileged class of materials having the potential to compete with inorganic semiconductors. As an experimental historical study of stability, we fabricated and characterized organic transistors from a material batch synthesized in 1932 and compared the results to a fresh material batch.