排序方式: 共有21条查询结果,搜索用时 31 毫秒
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采用电子束蒸发法在玻璃衬底上制备了具有较高结晶度和优异透光性能的CdS多晶薄膜,对制备样品的结构和光学性质进行了表征。结果表明,制备薄膜属于六方相多晶结构,沿(002)晶向择优取向生长。此外,随着衬底温度的升高,样品结晶质量先提高后降低,与薄膜厚度变化有关。紫外-可见透过谱显示,随着衬底温度的升高,薄膜的光吸收边趋于陡直,但光学带隙呈现波动变化,分布在2.389-2.448 eV之间。对样品进行光致发光谱测试表明,CdS薄膜发光锋展宽严重,仅在1.60 eV附近有一个微弱的红光发射。论文对上述实验结果进行了分析和讨论。 相似文献
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一、概述平衡吊是一种机床加工中的吊装设备。它适用于各种生产车间(机械加工、锻造、热处理及装配等)和汽车拖拉机修造厂车间的吊运装配等作业,具有动作灵活,可靠,操作方便,吊运准确度高等特点,而且具有某些机械手的特性。因此,随着工农业生产的发展,平衡吊越来越被广泛地采用。但是目前在平衡吊的设计中,特别是对平衡吊的四连杆平衡架的设计大多采用类比法和作图法。本文介绍的机算机BASIC程序就是对平衡吊工作臂架(四连杆平衡架)的优化设计。其主要目的是使其结构尺寸、工作区 相似文献
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采用电子束蒸发工艺在普通玻璃衬底上制备了PbI_2多晶薄膜,研究了不同衬底温度对薄膜结构、表面形貌及紫外-可见光谱的影响.XRD结构表征显示,不同衬底温度下沉积的PbI_2薄膜均属六方结构,低温下呈现(002)方向的c轴择优生长,但随着衬底温度的升高,择优生长弱化;SEM形貌分析结果表明,PbI_2薄膜的晶粒尺寸随着衬底温度的升高而增大,同时晶粒间应力造成的突起减少,薄膜表面致密度和平整度提高;UV光谱测试结果表明,不同衬底温度下制备PbI_2薄膜透过光谱的吸收限均在515nm附近,且呈现陡直的吸收边.计算发现,薄膜禁带宽度约为2.42 eV,随着衬底温度升高而略微增大,显示结晶质量提高.Abstract: Polycrystalline lead iodide (PbI_2) thin films were deposited on glass substrates by electron beam evaporation method.The influence of different substrate temperatures on the structure,surface morphology and optical transmittance of the films was studied.XRD analysis shows the PbI_2 films deposited at different temperatures possess hexagonal structure,with a preferred growth orientation of (002) at low temperature,but this preferred growth characteristic vanishes when the substrate temperature increases.SEM micrograph reveals the grain size of PbI_2 thin films increases with the rising substrate temperature,meanwhile,the surface bulges resulted from the strain between grains decrease,making the surface of the films more compact and uniform.UV transmittance shows the steep absorption edge is at 515 nm for all samples grown under different substrate temperatures and the corresponding band gap is about 2.42 eV. 相似文献
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Highly crystalline and transparent cadmium sulphide(CdS) films were deposited on glass substrate by electron beam evaporation technique.The structural and optical properties of the films were investigated.The X-ray diffraction analysis revealed that the CdS films have a hexagonal structure and exhibit preferred orientation along the(002) plane.Meanwhile,the crystalline quality of samples increased first and then decreased as the substrate temperature improved,which is attributed to the variation in film thickness.UV-vis spectra of CdS films indicate that the absorption edge becomes steeper and the band gap present fluctuation changes in the range of 2.389-2.448 eV as the substrate temperature increased.The photoluminescence peak of the CdS films was found to be broadened seriously and there only emerges a red emission band at 1.60 eV.The above results were analyzed and discussed. 相似文献
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