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substrate effect ON HYDROGENATED MICROCRYSTALLINE SILICON FILMS DEPOSITED WITH VHF-PECVD TECHNIQUE

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Acta Metallurgica Sinica(English Letters) 2006年第4期19卷 295-300页

作者： H.D. Yang Department of Electronic Engineering Jinan University Guangzhou 510632 China

Raman spectra and scanning electron microscope （SEM） techniques were used to determine the structural properties of microcrb＇stalline silicon （μc-Si：H） films deposited on different substrates with the very high frequency plasma-enhanced chemical vapor deposition （VHF-PECVD） technique. Using the Raman spectra, the values of crystalline volume fraction Xc and average grain size d are 86%, 12.3nm; 65%, 5.45nm; and 38%, 4.05nm, for single crystalline silicon wafer, coming 7059 glass, and general optical glass substrates, respectively. The SEM images further demonstrate the substrate effect on the film surface roughness. For the single crystalline silicon wafer and Coming 7059 glass, the surfaces of the μc-Si：H films are fairly smooth because of the homogenous growth or h＇ttle lattice mismatch. But for general optical glass, the surface of the μ-Si： H film is very rough, thus the growing surface roughness affects the crystallization process and determines the average grain size of the deposited material. Moreover, with the measurements of thickness, photo and dark conductivity, photosensitivity and activation energy, the substrate effect on the deposition rate, optical and electrical properties of the μc-Si：H thin films have also been investigated. On the basis of the above results, it can be concluded that the substrates affect the initial growing layers acting as a seed for the formation of a crystalline-like material and then the deposition rates, optical and electrical properties are also strongly influenced, hence, deposition parameter optimization is the key method that can be used to obtain a good initial growing layer, to realize the deposition of μc-Si：H films with device-grade quality on cheap substrates such as general glass.

关键词： hydrogenated microcrystalline silicon film VHF-PECVD (very high frequency plasma-enhanced chemical vapor deposition) substrate effect

Characterization of interface adhesion of dissimilar materials by a pressured blister test analyzed model considering substrate effect

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Characterization of interface adhesion of dissimilar materia...

effects of surface energy and substrate on modulus determination of biological films by conical indentation

第十二届全国物理力学学术会议

作者： L.-M.Jiang Y.-C.Zhou Faculty of Materials and Optoelectronic Physics Key Laboratory of Low Dimensional Materials and Application TechnologyXiangtan University College of Packing and Printing Hunan University of Technology

The pressurized blister test is a very convenient technique to measure the adhesion energy between the thin film and the *** this paper,the interface adhesion energy considering the substrate effect for an elastic film/substrate system was studied by the blister test. A theory based on the elastic plate with elastically restrained edges was proposed to evaluate the interface adhesion energy between the thin film and *** interface adhesion energy was much smaller than that obtained by neglecting the substrate effect for a steady state of crack growth,while the interface adhesion energy was much larger than that obtained by neglecting the substrate effect for an unsteady state of crack *** mixed-mode angle for bending deformation is obtained,and the ranges of the interface adhesion energy are obtained.

关键词： substrate effect interface adhesion thin film/substrate system

来源： cnki会议评论

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cnki会议

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Science China(Technological Sciences) 2024年第6期67卷 1757-1764页

作者： DING Yue LI Cheng-Ya NIU XinRui WANG Gang-Feng Department of Engineering Mechanics SVLXi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering City University of Hong KongHong Kong SAR999077China

Micro-/nano-indentation has become prevalent in evaluating the mechanical characteristics of biological samples,such as cells and ***,the existing contact models describing conical indentation ignore the joint effects of surface energy and substrate,and consequently cannot accurately extract the Young's modulus of biological samples deposited on *** finite element methods,we examine the conical indentation of biological films on substrates while taking surface energy into *** on the dimensional analysis,the explicit relationship between load and indentation depth is achieved for films with their moduli varying from 0.001 to 100 times that of the *** the classical Sneddon's model was employed to analyze the load-depth data,the measured modulus could reach 18 times the real modulus for films on harder substrates,but only 4%of the real modulus for films on softer ***,in micro-/nano-indentations,neglecting the contribution of surface energy would result in an overestimation of the Young's modulus of films depending on the contact *** analytical expression provided here can be utilized to precisely deduce the mechanical characteristics of biological films deposited on substrate from the load and indentation depth data of a conical indentation.

关键词： biological film surface effect substrate effect indentation

The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2

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Nano Research 2014年第4期7卷 561-571页

作者： Michele Buscema Gary A. Steele Herre S. J. van der Zant &ndres Castellanos-Gomez Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands

We quantitatively study the Raman and photoluminescence （PL） emission from single-layer molybdenum disulfide （MoS2） on dielectric （SiO2, hexagonal boron nitride, mica and the polymeric dielectric Gel-Film） and conducting substrates （Au and few-layer graphene）. We find that the substrate can affect the Raman and PL emission in a twofold manner. First, the absorption and emission intensities are strongly modulated by the constructive/destructive interference within the different substrates. Second, the position of the Alg Raman mode peak and the spectral weight between neutral and charged excitons in the PL spectra are modified by the substrate. We attribute this effect to substrate-induced changes in the doping level and in the decay rates of the excitonic transitions. Our results provide a method to quantitatively study the Raman and PL emission from MoSa-based vertical heterostructures and represent the first step in ad hoc tuning the PL emission of 1L MoS2 by selecting the proper substrate.

关键词： molybdenum disulfide van der Waalsheterostructures Raman microscopy photoluminescenceenhancement photoluminescencequenching substrate effect

substrate matters:The influences of substrate layers on the performances of thin-film composite reverse osmosis membranes

维普期刊数据库评论

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Chinese Journal of Chemical Engineering 2017年第11期25卷 1676-1684页

作者： Jie Li,Mingjie Wei YongWang State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced MaterialsCollege of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

Thin-film composite(TFC) reverse osmosis(RO) membranes are playing the dominating role in *** efforts have been put in the studies on the polyamide selective layers. However, the effect of the substrate layers is far less concerned. In this review, we summarize the works that consider the impacts of the substrates, including pore sizes, surface hydrophilicity, on the processes of interfacial polymerization and consequently on the morphologies of the active layers and on final RO performances of the composite membranes. All the works indicate that the pore sizes and surface hydrophilicity of the substrate evidently influence the RO performances of the composite membranes. Unfortunately, we find that the observations and understandings on the substrate effect are frequently varied from case to case because of the lack of substrates with uniform pores and surface chemistries. We suggest using track-etched membranes or anodized alumina membranes having relatively uniform pores and functionalizable pore walls as model substrates to elucidate the substrate ***, we argue that homoporous membranes derived from block copolymers have the potential to be used as substrates for the large-scale production of high-performances TFC RO membranes.

关键词： Reverse osmosis Thin-film composite Interfacial polymerization Homoporous membranes substrate effect

Interface energetics and engineering of organic heterostructures in organic photovoltaic cells

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Science China Chemistry 2016年第4期59卷 422-435页

作者： Yan-Qing Li Qian-Kun Wang Qing-Dong Ou Jian-Xin Tang Institute of Functional Nano & Soft Materials Collaborative Innovation Center of Suzhou Nano Science and TechnologyJiangsu Key Laboratory for Carbon-based Functional Materials & Devices Soochow University

The reliable information about interface energetics of organic materials, especially the energy level alignment at organic heterostructures is of pronounced importance for unraveling the photon harvesting and charge separation process in organic photovoltaic(OPV) cells. This article provides an overview of interface energetics at typical planar and mixed donor-acceptor heterostructures, perovskite/organic hybrid interfaces, and their contact interfaces with charge collection layers. The substrate effect on energy level offsets at organic heterostructures and the processes that control and limit the OPV operation are presented. Recent efforts on interface engineering with electrical doping are also discussed.

关键词： organic photovoltaic cell organic heterostructure energy level alignment substrate effect interface engineering

Growth mechanism and modification of electronic and magnetic properties of silicene

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Chinese Physics B 2015年第8期24卷 77-86页

作者：柳洪盛韩楠楠赵纪军 Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Dalian University of Technology)Ministry of Education

Silicene, a monolayer of silicon atoms arranged in a honeycomb lattice, has been undergoing rapid development in recent years due to its superior electronic properties and its compatibility with mature silicon-based semiconductor technology. The successful synthesis of silicene on several substrates provides a solid foundation for the use of silicene in future microelectronic devices. In this review, we discuss the growth mechanism of silicene on an Ag(111) surface, which is crucial for achieving high quality silicene. Several critical issues related to the electronic properties of silicene are also summarized, including the point defect effect, substrate effect, intercalation of alkali metal, and alloying with transition metals.

关键词： silicene growth mechanism electronic properties substrate effect

ANALYSIS OF NANOBRIDGE TESTS

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Acta Mechanica Solida Sinica 2010年第4期23卷 283-296页

作者： Wing Kin Chan Jianrong Li Yong Wang Shengyao Zhang Tongyi Zhang (Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China) Department of Mechanical Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

This paper analyzes nanobridge tests with consideration of adhesive contact deformation, which occurs between a probe tip and a tested nanobeam, and deformation of a substrate or template that supports the tested *** displacement-load relation, including adhesive contact deformation and substrate deformation, is presented here for small deformation of *** analytic results are confirmed by finite element *** adhesive contact deformation and substrate deformation are not considered in the analysis of nanobridge test data, they might lead to lower values of Young＇s modulus of tested nanobeams.

关键词： nanobridge tests size-dependency adhesion contact compliance surface effect substrate effect finite element

Scaling relationships of elastic-perfectly plastic film/coating materials from small scale sharp indentation

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Science China(Technological Sciences) 2021年第6期64卷 1302-1310页

作者： WANG ZhaoXin WANG JiRu WANG Wen Yang NIU YiHan LI Cong ZONG XiangYu ZHANG JianHai ZHAO HongWei Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025China School of Mechanical&Aerospace Engineering Jilin UniversityChangchun 130025China

The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a wide range of film/coating materials with different ratios in term of the Young’s modulus and yield strength were examined, namely different values of Ef/Esand Yf/*** on these scaling relationships, the substrate effects on indentation response and deformed surface profile of residual imprint are given. Furthermore, the scaling relationship among the work of indentation, reduced elastic modulus and hardness has been found. It is found that the ratio of the indentation hardness to measurement of substrate elastic modulus could be used to characterize the wear resistance of film/coating materials. In addition, a novel method to acquire the intrinsic hardness and elastic modulus of film/coating materials is proposed combined with the well-known 10% critical indentation depth rule, which avoids the error caused by estimating the contact area. This work could be contributed for characterizing the mechanical properties of film/coating materials at micro-and nanoscale.

关键词： scaling relationships substrate effect dimensional analysis finite element modeling film/coating materials indentation