共查询到19条相似文献,搜索用时 171 毫秒
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溶胶-凝胶法制备钛酸锶钡薄膜 总被引:2,自引:0,他引:2
采用溶胶-凝胶(Sol-Gel)法制备钛酸锶钡(BST)薄膜,采用快速热处理(RTA)对薄膜进行烧结。利用DSC、XRD、SEM等技术分析了钛酸锶钡凝胶的热解过程,以及不同溶胶浓度下薄膜的晶粒、晶相、介温特性。实验表明:低浓度的溶胶(0.05mol/L)所制备的薄膜具有较大的介电反常,其晶相具有(111)取向性;而用0.3mol/L的溶胶制备的BST薄膜,晶粒没有(111)取向;用0.05mol/L溶胶制备,使BST薄膜的介温特性得到很大的改善,介温变化率dε(ε·dT)在11°C左右可达6%。 相似文献
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BST薄膜的磁增强反应离子刻蚀研究 总被引:1,自引:1,他引:0
分别以CF4/Ar和CF4/Ar/O2作为刻蚀气体,采用磁增强反应离子刻蚀(MERIE)技术对sol-gel法制备的BST薄膜进行刻蚀。结果表明,刻蚀速率与刻蚀气体的混合比率呈现非单调特性。当CF4/Ar的气体流量比R(CF4:Ar)为10:40时,刻蚀速率达到极大值。当CF4/Ar/O2的气体流量比R(CF4:Ar:O2)为9:36:5时,刻蚀速率达到最大值,最大刻蚀速率为8.47nm/min。原子力显微镜(AFM)分析表明,刻蚀后的薄膜表面粗糙度变大。对刻蚀后的薄膜再进行适当的热处理,可以去除部分残留物。 相似文献
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高度(100)取向的BST薄膜及其高介电调谐率 总被引:2,自引:0,他引:2
用脉冲激光沉积法制备(Ba1-xSrx)TiO3(x=0.35,0.50简称BST35和BST50)介电薄膜。在650℃原位退火10min,获得高度(100)取向柱状生长的晶粒。BST35薄膜的平均晶粒尺寸为50nm,BST50薄膜的晶粒尺寸为150~200nm。在室温和1MHz条件下,BST35的最大εr和调谐率分别达到810和76%,其介电调谐率高于国内外同类文献报道的数据;BST50的εr和调谐率最大分别达到875和63%。薄膜为(100)取向生长,因为薄膜沿平面c轴极化而产生应力,在电场作用下,而获得高介电调谐率。 相似文献
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溶胶-凝胶法制备外延Ba1-xSrxTiO3薄膜及其结构与性能研究 总被引:5,自引:0,他引:5
应用溶胶-凝胶技术在Pt/MgO(100)衬底上成功地制备了Ba0.65Sr0.35TiO3外延薄膜.XRD和SEM分析结果表明该薄膜在O2气氛中650℃热处理1h后,其(001)面是沿着Pt(100)和MgO(100)面外延取向生长的;薄膜表面均匀致密,厚度为260nm,平均晶粒大小为48.5nm.当测试频率为10kHz时,BST薄膜的介电常数和损耗因子分别为480和0.02.介电常数-温度关系测试结果表明sol-gel工艺制备的Ba0.65Sr0.35TiO3薄膜其居里温度在35℃左右,且在该温度下Ba0.65Sr0.35TiO3薄膜存在扩散铁电相变特征.当外加偏置电压为3V时,BST薄膜的漏电流密度为1.5×10-7A/cm2.该薄膜可作为制备新型非制冷红外焦平面阵列和先进非制冷红外热像仪的优选材料. 相似文献
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Su Hwan Oh Chul-Wook Lee Ji-Myon Lee Ki Soo Kim Hyunsung Ko Sahnggi Park Moon-Ho Park 《Photonics Technology Letters, IEEE》2003,15(10):1339-1341
We optimized the etching process for butt coupling to improve the reproducibility and the uniformity of the process for the integrated GaInAsP multiquantum-well laser with a butt-coupled waveguide. Three different ways of etching process were tested, which are reactive ion etching (RIE), RIE followed by a small amount (50 nm thick) of selective wet etching, and RIE followed by an adequate amount (125 nm thick) of selective wet etching. RIE followed by an adequate amount of selective wet etching showed the superior properties to the common expectation on RIE only, giving the measured coupling efficiency 96/spl plusmn/1.7% versus 34/spl plusmn/8%. The high coupling efficiency and the very small variation across a quarter of a 2-in wafer demonstrate that RIE coupled with an adequate amount of selective wet etching can also replace the conventional process for butt coupling, RIE followed by HBr-based nonselective wet etching, to fabricate high-quality integrated photonic devices. 相似文献
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Epitaxial Ba0.6Sr0.4TiO3 (BST) thin films were deposited on LaAlO3 (LAO) substrates with the conductive metallic oxide La0.5Sr0.5CoO3 (LSCO) film as a bottom electrode by pulsed laser deposition (PLD). Xray relationship of BST/LSCO/LAO was [001] BST//[001]LSCO//[001] LAO. The atomic force microscope (AFM)revealed a smooth and crackfree surface of BST films on LSCOcoated LAO substrate with the average grain size of 120 nm and the RMS of 1.564 nm for BST films.Pt/BST/LSCO capacitor was fabricated to perform CapacitanceVoltage measurement indicating good insulating characteristics. For epitaxial BST film, the dielectric constant and dielectric loss were determined as 471 and 0.03, respectively. The tunabilty was 79.59% and the leakage current was 2.63×107 A/crm2 under an applied filed of 200 kV/cm. Furthermore, it was found that epitaxial BST (60/40) films demonstrate wellbehaved ferroelectric properties with the remnate polarization of 6.085 μC/cm2 and the coercive field of 72 kV/cm. The different electric properties from bulk BST (60/40)materials with intrinsic paraelectric characteristic are attributed to the interface effects. 相似文献
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Zuci Quan Tianjin Zhang Tao Guo Ruikun Pan Juan Jiang 《Microelectronic Engineering》2007,84(4):631-637
Sol-gel-derived Ba0.65Sr0.35TiO3 (BST) thin films were etched in CF4/Ar/O2 plasma using magnetically enhanced reactive ion etching technology. The maximum etch rate of BST film is 8.47 nm/min when CF4/Ar/O2 gas mixing ratio is equal to 9/36/5. X-ray photoelectron spectroscopy analysis indicates the accumulation of fluorine-containing by-products on the etched surface due to their poor volatility, resulting in (Ba,Sr)-rich and (Ti,O)-deficient etched surface. Compared to the unetched counterparts, the etched Ba 3d5/2, Ba 3d3/2, Sr 3d5/2, Sr 3d3/2, Ti 2p3/2, Ti 2p1/2 and O 1s photoelectron peaks shift towards higher binding energy regions by amounts of 1.31, 1.30, 0.60, 0.79, 0.09, 0.46 and 0.50 eV, respectively. X-ray diffraction (XRD) analysis reveals that intensities of the etched BST (1 0 0), (1 1 0), (2 0 0) and (2 1 1) peaks are lowered and broadened. Raman spectra confirm that the Raman peaks of the etched film shift towards lower wave number regions with the values of 7, 6, 4 and 4 cm−1, and the corresponding phonon lifetimes are longer than those of the unetched film because of the plasma-induced damage. When the etched films are postannealed at 650 °C for 20 min under an O2 ambience, the chemical shifts of Ba 3d, Sr 3d, Ti 2p and O 1s peaks, the variations for atomic concentrations of Ba, Sr, Ti and O, and the Raman redshifts are reduced, while the corresponding XRD peak intensities increase. It is conceivable that the plasma-induced damage of the etched film could be partially recovered during the postannealing process. 相似文献
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Structural and Electrical Characters of Ba0.6Sr0.4TiO3/La0.5Sr0.5CoO3 Thin Films by Plus Laser Deposition
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Epitaxial Ba0.6Sr0.4TiO3 (BST) thin films were deposited on LaAlO3 (LAO) substrates with the conductive metallic oxide La0.5Sr0.5CoO3 (LSCO) film as a bottom electrode by pulsed laser deposition (PLD). X-ray diffraction ~2 and Ф scan showed that the epitaxial relationship of BST/LSCO/LAO was [001] BST//[001] LSCO//[001] LAO. The atomic force microscope (AFM) revealed a smooth and crack-free surface of BST films on LSCO-coated LAO substrate with the average grain size of 120 nm and the RMS of 1.564 nm for BST films. Pt/BST/LSCO capacitor was fabricated to perform CapacitanceVoltage measurement indicating good insulating characteristics. For epitaxial BST film, the dielectric constant and dielectric loss were determined as 471 and 0.03, respectively. The tunabilty was 79.59% and the leakage current was 2.6310-7 A/cm2 under an applied filed of 200 kV/cm. Furthermore, it was found that epitaxial BST (60/40) films demonstrate well-behaved ferroelectric properties with the remnate polarization of 6.085 C/cm2 and the coercive field of 72 kV/cm. The different electric properties from bulk BST (60/40) materials with intrinsic paraelectric characteristic are attributed to the interface effects. 相似文献
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利用氩离子束镀膜技术和硅平面工艺在经过干氧氧化的硅衬底上制备一层钛酸锶钡薄膜 ,并在氧气中进行不同条件的退火处理 ,然后蒸铝及利用光刻技术制作铝电极而形成 MIOS电容结构 ,研究其物理及电学特性。结果表明 ,氧退火条件对衬底的钛酸锶钡薄膜的物理及电学特性有较为明显的影响。 相似文献
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Gwan-Ha Kim 《Microelectronic Engineering》2007,84(1):187-191
In this work, we investigated etching characteristics of BST thin films and higher selectivity of BST over Si using inductive coupled O2/Cl2/Ar plasma (ICP) system. The maximum etch rate of BST thin films and selectivity of BST over Si were 61.5 nm/min at a O2 addition of 1 sccm, 9.52 at a O2 addition of 4 sccm into the Cl2(30%)/Ar(70%) plasma, respectively. Plasma diagnostics was performed by Langmuir probe (LP), optical emission spectroscopy (OES) and quadrupole mass spectrometry (QMS). These results confirm that the increased etch rates at O2 addition of 1 sccm is the result of the enhanced chemical reaction between BST and Cl radicals and an ion bombardment effect. 相似文献