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Major factors affecting the dielectric properties and reliability of solid stated reacted BaTiO3 powders for capacitor 影响电容器用固态反应BaTiO3粉末介电性能和可靠性的主要因素
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-23 DOI: 10.1080/21870764.2022.2114671
Seong Hyeok Choi, Yoon-Seok Lee, Hun Kwak, H. Jung, Min-Kee Kim, S. Cho, J. Yoon, JiYeoun. Choi, Min Seong Kim, Ji Hyeon Kim, I. Jo, Yangdo Kim, Moonhee Choi
ABSTRACT In this study, solid-state BaTiO3 was successfully synthesized after the disintegration of the starting materials (BaCO3 and TiO2) under various conditions. By analyzing the microstructure, tetragonality, crystallinity, and particle size distribution of the synthesized powder, the factors that affected the properties of the BaTiO3 solid-state synthetic powder were successfully identified. Furthermore, the changes in the dielectric constants (temperature characteristic coefficients) of the sintered specimens were investigated using each powder, according to the dielectric characteristics, high-temperature resistance, and temperature, to identify the direct and indirect relationships between the disintegration conditions, synthetic powders, and sintered specimens. Finally, optimal conditions for the uniform solid-state synthesis of BaTiO3 powder for multilayer ceramic capacitor production were derived.
本研究以BaCO3和TiO2为原料,在不同条件下进行分解,成功合成了固态BaTiO3。通过对合成粉体的微观结构、四方性、结晶度和粒度分布的分析,确定了影响BaTiO3固态合成粉体性能的因素。此外,根据各粉末的介电特性、耐高温性和温度,研究了烧结试样的介电常数(温度特征系数)的变化,以确定崩解条件、合成粉末和烧结试样之间的直接和间接关系。最后,导出了制备多层陶瓷电容器用BaTiO3粉末的最佳工艺条件。
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引用次数: 2
Development of beta-carotene-loaded poly(lactic acid)/hydroxyapatite core-shell nanoparticles for osteoblast differentiation 用于成骨细胞分化的β -胡萝卜素负载聚乳酸/羟基磷灰石核壳纳米颗粒的开发
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-23 DOI: 10.1080/21870764.2022.2127262
S. Lee, Y. Sugimoto, Katsuya Kato, T. Miyajima, M. Sakurai, F. Nagata
ABSTRACT Beta-carotene (BC) is a nutrient in vegetables and a precursor of vitamin A. BC has been reported to have anticarcinogenic, antiaging, and antioxidation properties and prevents heart diseases. Recently, BC has gained significant attention due to stimulating effect on osteoblast differentiation. Poly(lactic acid)/hydroxyapatite (PLA/HAp) core-shell nanoparticles have been reported earlier with a load capacity of 250% for water-insoluble substances, using a surfactant-free emulsification method. In this work, PLA/HAp core-shell nanoparticles loaded with BC were prepared, and osteoblast differentiation behavior was evaluated. BC was successfully loaded into PLA/HAp core-shell nanoparticles with diameters of approximately 30 nm. BC/loaded PLA/HAp core-shell nanoparticles stimulated osteoblast differentiation by upregulating collagen type I, osteopontin, and osteocalcin expression. In addition, the gene expression levels of these osteoblasts were significantly larger than those stimulated by PLA/HAp core-shell nanoparticles without BC and cultured in a differential medium (with ascorbic acid and β-glycerophosphate). PLA/HAp core-shell nanoparticles showed satisfactory cytocompatibility because they were attached to the osteoblasts. Consequently, BC was effectively delivered to osteoblasts by nanoparticles. These results suggested that BC-loaded PLA/HAp core-shell nanoparticles could enhance bone formation. Graphical Abstract
β -胡萝卜素(BC)是蔬菜中的一种营养物质,是维生素a的前体。据报道,BC具有抗癌、抗衰老和抗氧化的特性,可以预防心脏病。近年来,BC因其对成骨细胞分化的刺激作用而备受关注。聚(乳酸)/羟基磷灰石(PLA/HAp)核壳纳米颗粒采用无表面活性剂的乳化方法,对水不溶性物质的负载能力为250%。本研究制备了载BC的聚乳酸/羟基磷灰石核壳纳米颗粒,并对其成骨细胞分化行为进行了评价。BC成功加载到直径约为30 nm的PLA/HAp核壳纳米颗粒中。BC/负载PLA/HAp核壳纳米颗粒通过上调I型胶原、骨桥蛋白和骨钙素的表达来刺激成骨细胞分化。此外,这些成骨细胞的基因表达水平显著高于不含BC的PLA/HAp核壳纳米颗粒和在差异培养基(含抗坏血酸和β-甘油磷酸盐)中培养的成骨细胞。聚乳酸/羟基磷灰石核壳纳米颗粒与成骨细胞相结合,具有良好的细胞相容性。因此,BC通过纳米颗粒有效地递送到成骨细胞。这些结果表明,bc负载的PLA/HAp核壳纳米颗粒可以促进骨的形成。图形抽象
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引用次数: 1
Effect of Al(OH)3 addition on densification mechanism and properties of reaction-sintered mullite-corundum composite ceramics Al(OH)3对反应烧结莫来石-刚玉复合陶瓷致密化机理及性能的影响
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-21 DOI: 10.1080/21870764.2022.2114145
Zhenying Liu, N. Xie, Hanxin Zhang, Shouwu Huang, Chongmei Wu, Shuhuan He, Jinbo Zhu, Yin Liu
ABSTRACT Mullite composite ceramics were fabricated by using mullite powder from waste coal gangue and Al(OH)3 as starting materials. The effects of sintering temperature and Al(OH)3 content on phase composition, microstructure, and mechanical properties of the ceramics were systematically investigated. Results show that the bulk density and flexural strength of composite ceramics increase as the temperature increases from 1480°C to 1560°C. The composite ceramics exhibit optimal performances with addition of 10 wt.% Al(OH)3 at 1560°C, a bulk density of 2.43 g/cm3 and a flexural strength of 124.28 MPa, respectively. Moreover, additional Al(OH)3 promotes a reaction between SiO2 and Al2O3 and forms more mullite phase. The increase in mullite content endows the composite ceramics with high mechanical properties. Scanning electron microscope images indicate that the mullite particles exhibit an interlocking structure, while the corundum phase is “pinned” within the mullite interlocking structure, contributing to the mechanical properties of composite ceramics.
摘要以废弃煤矸石和Al(OH)3为原料,制备了莫来石复合陶瓷。系统地研究了烧结温度和Al(OH)3含量对陶瓷相组成、微观结构和力学性能的影响。结果表明,复合陶瓷的体积密度和弯曲强度随着温度从1480°C升高到1560°C而增加。在1560°C下添加10wt.%Al(OH)3,体积密度为2.43g/cm3,弯曲强度为124.28MPa,复合陶瓷表现出最佳性能。此外,额外的Al(OH)3促进SiO2和Al2O3之间的反应并形成更多的莫来石相。莫来石含量的增加使复合陶瓷具有较高的力学性能。扫描电子显微镜图像表明,莫来石颗粒呈现出互锁结构,而刚玉相被“钉扎”在莫来石互锁结构中,有助于复合陶瓷的力学性能。
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引用次数: 2
High-voltage insulation and dielectric properties of ceramic-glass composites 陶瓷-玻璃复合材料的高压绝缘和介电性能
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-20 DOI: 10.1080/21870764.2022.2123522
Ming-Yueh Hsieh, Wen-Shiush Chen, Cheng-Hsing Hsu, Cheng-Hsuan Wu
ABSTRACT This paper reveals the high-voltage insulation properties – namely the dielectric constant, dissipation factor, breakdown strength, and voltage – of epoxy resin samples of various thicknesses containing the microadditives albite, potassium feldspar, lithium glass, and zinc glass in different concentrations. 0.1 wt% KAlSi3O8 ceramic powders as fillers in 1 mm epoxy composites designed for insulation is taken as the choice for highest breakdown strength 36.6491 kV/mm. After that, 5 wt% Li-Bi-B-O glass at 35.4687 kV/mm, 10 wt% Zn-Bi-B-O glass at 35.0432 kV/mm, and 10 wt% NaAlSi3O8 at 33.6504 kV/mm. The increase of thickness more than 1 mm is not recommended in the practical application due to the decrease of breakdown strength. Multi-layer thin structure is recommended for insulation purpose.
摘要本文揭示了含有不同浓度的微添加剂钠长石、钾长石、锂玻璃和锌玻璃的不同厚度环氧树脂样品的高压绝缘性能,即介电常数、耗散因子、击穿强度和电压。选择0.1 wt%的KAlSi3O8陶瓷粉末作为1mm环氧树脂复合材料中的填料,设计用于绝缘,以获得最高击穿强度36.6491kV/mm。之后,在35.4687kV/mm下加入5wt%的Li-Bi-B-O玻璃,在35.0432kV/mm下添加10wt%的Zn-Bi-B-O玻璃,在33.6504kV/mm下放入10wt%的NaAlSi3O8。在实际应用中,由于击穿强度降低,不建议厚度增加超过1mm。出于绝缘目的,建议采用多层薄结构。
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引用次数: 2
Calcium phosphate cements comprising spherical porous calcium phosphate granules: synthesis, structure, and properties 球形多孔磷酸钙颗粒磷酸钙水泥的合成、结构和性能
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-16 DOI: 10.1080/21870764.2022.2123514
M. Kamitakahara, Kanau Asahara, H. Matsubara
ABSTRACT Calcium phosphate cements (CPCs) are used as artificial bone materials. The bone regeneration ability of CPCs can be improved by controlling their composition, porosity, and pore size. This study aims to design novel CPCs with high bone regeneration ability by controlling their microstructure. CPCs with macropores and micropores were prepared by incorporating spherical porous calcium phosphate granules composed of rod-shaped, calcium-deficient hydroxyapatite (CDHA) or plate-shaped octacalcium phosphate (OCP) particles. The granules were mixed with a binder (cement powder) composed primarily of α-tricalcium phosphate. The structure, morphology, compressive strength, porosity, specific surface area, pore size distribution, dissolution characteristics, and effects on cell viabilities were studied for the synthesized samples. The CPCs composed of porous granules had high porosity (~80%) and both macropores and micropores, which are expected to contribute to bone regeneration. The CPCs composed of porous granules showed a smaller specific surface area but a larger dissolution rate than the granule-free samples. The CPC composed of OCP granules showed a higher dissolution rate than the CPCs containing CDHA granules. In the cell culture experiments, the preosteoblasts proliferated on the CPCs, indicating that these CPCs could function as scaffolds for bone regeneration. Graphical Abstract
摘要磷酸钙骨水泥是一种人工骨材料。CPC的骨再生能力可以通过控制其组成、孔隙率和孔径来提高。本研究旨在通过控制其微观结构来设计具有高骨再生能力的新型CPC。通过掺入由杆状缺钙羟基磷灰石(CDHA)或板状磷酸八钙(OCP)颗粒组成的球形多孔磷酸钙颗粒,制备了具有大孔和微孔的CPC。将颗粒与主要由α-磷酸三钙组成的粘合剂(水泥粉)混合。研究了合成样品的结构、形貌、抗压强度、孔隙率、比表面积、孔径分布、溶解特性以及对细胞活力的影响。由多孔颗粒组成的CPC具有高孔隙率(~80%),同时具有大孔和微孔,有望有助于骨再生。由多孔颗粒组成的CPC显示出比表面积较小但溶解速率大于无颗粒样品。由OCP颗粒组成的CPC显示出比含有CDHA颗粒的CPC更高的溶解速率。在细胞培养实验中,前成骨细胞在CPC上增殖,表明这些CPC可以作为骨再生的支架。图形摘要
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引用次数: 1
Surface morphology engineering of metal oxide-transition metal dichalcogenide heterojunction 金属氧化物-过渡金属二硫族化合物异质结的表面形态工程
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-09-05 DOI: 10.1080/21870764.2022.2117892
Chang-Hwan Oh, R. S. Babu, Seung-il Kim, Dong-Park Lee, Gyuhyeon Sim, Do-Hyeon Lee, Yeonjin Je, Kim Chan Hwi, W. Jeong, G. Ryu, Jun Young Kim, S. Nam, Jae Hyun Lee, Jun‐Hong Park
ABSTRACT A tremendous effort has been made to develop 2D materials-based FETs for electronic applications due to their atomically thin structures. Typically, the electrical performance of the device can vary with the surface roughness and thickness of the channel layer. Therefore, a two-step surface engineering process is demonstrated to tailor the surface roughness and thickness of MoSe2 multilayers involving exposure of O2 plasma followed by dipping in (NH4)2S(aq) solution. The O2 plasma treatment generated an amorphous MoOx layer to form a MoOx/MoSe2 heterojunction, and the (NH4)2S(aq) treatment tailored the surface roughness of the heterojunction. The ON/OFF current ratio of MoSe2 FET is about 1.1 × 105 and 5.7 × 104 for bare and chemically etched MoSe2, respectively. The surface roughness of the chemically treated MoSe2 is higher than that of the bare, 4.2 ± 0.5 nm against 3.6 ± 0.5 nm. Conversely, a 1-hour exposure of the multilayer MoOx/MoSe2 heterostructure with the (NH4)2S(aq) solution removed the amorphous oxide layer and scaled down the thickness of MoSe2 from ~92.2 nm to ~38.9 nm. The preliminary study shows that this simple two-step strategy can obtain a higher surface-area-to-volume ratio and thickness engineering with acceptable variation in electrical properties.
摘要:由于其原子级薄的结构,开发用于电子应用的基于2D材料的FET已经付出了巨大的努力。通常,器件的电性能可以随着沟道层的表面粗糙度和厚度而变化。因此,证明了一种两步表面工程工艺来调整MoSe2多层膜的表面粗糙度和厚度,包括暴露O2等离子体,然后浸入(NH4)2S(aq)溶液。O2等离子体处理产生无定形MoOx层以形成MoOx/MoSe2异质结,并且(NH4)2S(aq)处理定制异质结的表面粗糙度。对于裸露的和化学蚀刻的MoSe2,MoSe2 FET的导通/截止电流比分别约为1.1×105和5.7×104。化学处理的MoSe2的表面粗糙度高于裸的,分别为4.2±0.5 nm和3.6±0.5 nm。相反,多层MoOx/MoSe2异质结构与(NH4)2S(aq)溶液的1小时暴露去除了非晶氧化物层,并将MoSe2的厚度从~92.2nm缩小到~38.9nm。初步研究表明,这种简单的两步策略可以在电学性能变化可接受的情况下获得更高的表面积体积比和厚度工程。
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引用次数: 1
Facile synthesis of zinc hydroxyfluoride nanobelt and effect of hexamethylenetetramine for growth direction 羟基氟化锌纳米带的简易合成及六亚甲基四胺对生长方向的影响
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-08-22 DOI: 10.1080/21870764.2022.2113963
Kim Kyusung, Chunyan Li, P. Choi, T. Itoh, Y. Masuda
ABSTRACT Control of nanomaterial morphology has been investigated to utilize for the desired application. 1D nanomaterials are ideal for various applications because of their excellent carrier transportability and huge specific surface area. Due to their advantages, various methods have been developed to grow in a specific direction. Herein, we introduced a simple synthesis method of freestanding Zinc hydroxidefluoride (ZnOHF) nanobelt as 1D material without seed or substrate using aqueous solutions. The ZnOHF nanobelt was synthesized using zinc fluoride and hexamethylenetetramine (HMT) at 80°C for 3 h. Even though low synthesis temperature, ZnOHF demonstrated good crystallinity and a homogeneous nanobelt structure. The ZnOHF nanobelts were grown over several μm to <010> direction with less than 100 nm width. In addition, the growth direction of the nanobelt was controlled by the concentration of HMT. The width of the nanobelt was broader by a decrease in HMT concentration. It was considered that crystal nucleation and growth of ZnOHF could be influenced by OH− and NH4 + ions generated from HMT decomposition. GRAPHICAL ABSTRACT
摘要对纳米材料形态的控制进行了研究,以用于所需的应用。1D纳米材料由于其优异的载流子迁移性和巨大的比表面积而非常适合各种应用。由于它们的优势,人们开发了各种方法来朝着特定的方向发展。在此,我们介绍了一种使用水溶液在没有种子或基底的情况下合成作为1D材料的独立式水合氟化锌(ZnOHF)纳米带的简单方法。使用氟化锌和六亚甲基四胺(HMT)在80°C下合成ZnOHF纳米带3小时。即使合成温度较低,ZnOHF也表现出良好的结晶度和均匀的纳米带结构。ZnOHF纳米带沿宽度小于100nm的方向生长了几微米。此外,纳米带的生长方向由HMT的浓度控制。纳米带的宽度随着HMT浓度的降低而变宽。认为HMT分解产生的OH−和NH4+离子可能影响ZnOHF的晶体成核和生长。图形摘要
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引用次数: 3
Humidity effect on electrical performance and bias stability of solution-processed In2O3 thin film transistor 湿度对溶液法制备In2O3薄膜晶体管电性能和偏置稳定性的影响
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-07-03 DOI: 10.1080/21870764.2022.2112373
Yanan Ding, Yajie Ren, Zifan Wang, Haiyang Qiu, F. Shan, Guoxia Liu
ABSTRACT Relative humidity (RH) in storage environment has a great impact on the electrical performance of thin film transistors (TFTs), and the RH is critical for semiconductor manufacturing and device packaging. In this work, solution-processed indium oxide (In2O3) TFT is fabricated, and the electrical performance of the device is investigated after being exposed to various RH conditions. It is found that the threshold voltage (Vth) and the mobility of In2O3 TFT exhibit clear responses to the RH ranging from 23% to 85%. The inherent mechanism about the humidity effect on the electrical performance is elaborated, and this is due to the “donor effect” from the absorbed water molecules. In addition to the effect on Vth and mobility, RH also exhibits a significant effect on the electrical stability of the TFT. The experimental result indicates that the In2O3 TFT exposed to RH <50% exhibits excellent stability with an applied positive bias stressing for 2000s.
存储环境中的相对湿度(RH)对薄膜晶体管(TFTs)的电性能影响很大,对于半导体制造和器件封装至关重要。在这项工作中,制备了溶液处理的氧化铟(In2O3) TFT,并研究了该器件在不同RH条件下的电性能。研究发现,阈值电压(Vth)和In2O3 TFT的迁移率对相对湿度在23% ~ 85%范围内有明显的响应。阐述了湿度对电性能影响的内在机理,这是由于被吸收的水分子的“施主效应”。除了对Vth和迁移率的影响外,RH对TFT的电稳定性也有显著影响。实验结果表明,在RH <50%的条件下,在施加正偏置应力的情况下,In2O3 TFT具有良好的稳定性。
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引用次数: 3
Micro-toughness of ZrB2-based ceramics evaluated by ultra-shallow V-notch 超浅v形缺口评价zrb2基陶瓷的微韧性
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-07-03 DOI: 10.1080/21870764.2022.2104433
Xinyuan Zhao, Anzhe Wang, Dazhao Liu, Huimin Yin, Zhiwei Xia, Changhao Xu, Peng Zhou
ABSTRACT Because of the essential difference between micro-toughness and macro-toughness, the indiscriminate application of deep notch tests may result in serious errors of micro-toughness associated with shallow cracks or flaws in ceramics. Here, the micro-toughness values of ZrB2, ZrB2-SiC and ZrB2-SiC-Grapite ceramics were successfully measured through ultra-shallow sharp V-notches (depth less than 40 μm, the ratio of notch depth to sample height less than 0.01) produced by nanosecond laser on the surface of bending bars for the first time. Results indicated that the micro-toughness values obtained from these three typical ceramics were significantly lower than the macro-toughness values measured from deep notches. Furthermore, conflicts may arise when comparing the micro- with macro-toughness between different materials, such as the macro-toughness of ZrB2-SiC-G was larger than that of ZrB2-SiC, while a contrary result was obtained for micro-toughness. Compared with the indentation method, improved accuracy of micro-toughness measurement could be obtained by this method.
由于微韧性与宏观韧性的本质区别,不加选择地应用深缺口测试可能会导致陶瓷微韧性与浅裂纹或缺陷相关的严重误差。本文首次利用纳秒激光在弯曲棒表面制备了ZrB2、ZrB2- sic和ZrB2- sic -石墨陶瓷的超浅锐v形缺口(深度小于40 μm,缺口深度与样品高度之比小于0.01),成功地测量了ZrB2、ZrB2- sic和ZrB2- sic -石墨陶瓷的微韧性值。结果表明,这三种典型陶瓷的微韧性值明显低于深缺口测量的宏观韧性值。此外,在比较不同材料的微观韧性和宏观韧性时,可能会出现冲突,如ZrB2-SiC- g的宏观韧性大于ZrB2-SiC,而微观韧性则相反。与压痕法相比,该方法可以提高微韧性测量的精度。
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引用次数: 0
Performance improvement of thin-film transistors with In2O3 channel engineering In2O3沟道工程对薄膜晶体管性能的改善
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2022-07-03 DOI: 10.1080/21870764.2022.2101597
Chengzhe Han, Junjie Wang, Guoxia Liu, F. Shan
ABSTRACT Thin-film transistors (TFTs) with bilayer channels were used to improve the field-effect mobility and bias stress stability of the TFTs. Homogeneous structures were fabricated by the combination of a carrier deficient layer made of In2O3 thin film annealed in oxygen atmosphere (InO:O) and an electron injection layer made of In2O3 thin film annealed in air (InO:A). Compared with the InO:A/InO:A TFT with only air annealing, the field-effect mobility of InO:O/ InO:A TFT with two-step annealing process was improved from 0.04 to 5.11 cm2/Vs, the on/off current ratio was ameliorated from 4.6 × 105 to 7.6 × 107 A, while the VTH is decreased from 12.5 to 4.7 V under the positive bias stressing (PBS). It is confirmed that the excessive oxygen vacancies are produced by annealing the thin film in the air. The electrical performance of the InO:O/InO:A TFTs with two-step annealing process is greatly improved due to the formation of a low defect state and high carrier concentration electron transport layer, through the combination of the carrier transport layer and the carrier injection layer. These optimized electrical properties indicate an important step toward achieving transparent, high performance, and low-temperature metal oxides TFTs.
摘要采用具有双层沟道的薄膜晶体管(TFT)来提高TFT的场效应迁移率和偏置应力稳定性。通过由在氧气气氛中退火的In2O3薄膜制成的载流子缺陷层(InO:O)和由在空气中退火的in 2O3薄膜制成(InO:a)的电子注入层的组合来制造均匀结构。与仅空气退火的InO:A/InO:A TFT相比,两步退火工艺的InO:O/InO:A薄膜晶体管的场效应迁移率从0.04提高到5.11cm2/Vs,导通/关断电流比从4.6×105提高到7.6×107A,而在正偏压应力(PBS)下VTH从12.5降低到4.7V。证实了过量的氧空位是通过在空气中对薄膜进行退火而产生的。通过载流子传输层和载流子注入层的结合,形成了低缺陷态和高载流子浓度的电子传输层,大大提高了采用两步退火工艺的InO:O/InO:A TFT的电学性能。这些优化的电性能表明,实现透明、高性能和低温金属氧化物TFT迈出了重要一步。
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引用次数: 2
期刊
Journal of Asian Ceramic Societies
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