Superlattices and Microstructures最新文献_第7页

Microstructural evolution and ferroelectricity in HfO2 films HfO2薄膜的微观结构演变和铁电性

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.11

Dou Zhao, Zibin Chen, Xiaozhou Liao

{"title":"Microstructural evolution and ferroelectricity in HfO2 films","authors":"Dou Zhao, Zibin Chen, Xiaozhou Liao","doi":"10.20517/microstructures.2021.11","DOIUrl":"https://doi.org/10.20517/microstructures.2021.11","url":null,"abstract":"Ferroelectric (FE) materials, which typically adopt the perovskite structure with non-centrosymmetry and exhibit spontaneous polarization, are promising for applications in memory, electromechanical and energy storage devices. However, these advanced applications suffer from the intrinsic limitations of perovskite FEs, including poor complementary metal oxide semiconductor (CMOS) compatibility and environmental issues associated with lead. Hafnium oxide (HfO2), with stable bulk centrosymmetric phases, possesses robust ferroelectricity in nanoscale thin films due to the formation of non-centrosymmetric phases. Owing to its high CMOS compatibility and high scalability, HfO2 has attracted significant attention. In the last decade, significant efforts have been made to explore the origin of the ferroelectricity and factors that influence the FE properties in HfO2 films, particularly regarding the role of microstructure, which is vital in clarifying these issues. Although several comprehensive reviews of HfO2 films have been published, there is currently no review focused on the relationship between microstructure and FE properties. This review focuses on the microstructure-property relationships in FE polycrystalline and epitaxial HfO2 films. The crystallographic structures and characterization methods for HfO2 polymorphs are first discussed. For polycrystalline HfO2 films, the microstructure-FE properties relationships, driving force and kinetic pathway of phase transformations under growth parameters or external stimuli are reviewed. For epitaxial films, the lattice matching relations between HfO2 films and substrates and the corresponding impact on the FE properties are discussed. The FE properties between polycrystalline and epitaxial HfO2 films are compared based on their different microstructural characteristics. Finally, a future perspective is given for further investigating FE HfO2 films.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82121474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys cocrni基中熵合金力学性能综述

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.10

Ding Xu, Mingliang Wang, Tianxin Li, Xiang Wei, Yiping Lu

{"title":"A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys","authors":"Ding Xu, Mingliang Wang, Tianxin Li, Xiang Wei, Yiping Lu","doi":"10.20517/microstructures.2021.10","DOIUrl":"https://doi.org/10.20517/microstructures.2021.10","url":null,"abstract":"The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76391496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29

Influence of softening annealing on microstructural heredity and mechanical properties of medium-Mn steel 软化退火对中锰钢组织遗传和力学性能的影响

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.01

Fanglin Ding, Qinyi Guo, B. Hu, H. Luo

{"title":"Influence of softening annealing on microstructural heredity and mechanical properties of medium-Mn steel","authors":"Fanglin Ding, Qinyi Guo, B. Hu, H. Luo","doi":"10.20517/microstructures.2022.01","DOIUrl":"https://doi.org/10.20517/microstructures.2022.01","url":null,"abstract":"Softening annealing (SA) is often required for producing medium-Mn steels (MMS) as it lowers hardness so that they can be cold rolled to reduce thickness. The influences of different SA processes on the microstructural heredity during the processing route and the final tensile properties were studied. It was found that the SA process could either intensify or weaken the influence of the Mn segregation resulting from solidification on the subsequent microstructural evolution during the process, i.e., microstructural heredity. In the case when no SA was employed, both recrystallization and rapid growth of ferrite grains preceded the reverse austenitic transformation during the intercritical annealing (IA) in the Mn-lean regions, where very coarse ferrite grains were formed. This deteriorated ductility was due to the propagation of cracking along the boundary of the coarse-grained and fine-grained regions. In contrast, SA at a sufficiently high temperature could dissolve cementite, producing uniformly distributed austenite grains. They transformed to martensite during cold rolling but were reborn during IA. As a result, ultrafine austenite and ferrite grains were uniformly distributed, which improved ductility significantly. This study hints at a new approach to altering the microstructural heredity resulting from the heterogeneous Mn distribution in MMS.","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80603982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuning the bandgap of Cd1-xZnxS (x = 0~1) buffer layer and CIGS absorber layer for obtaining high efficiency 调整Cd1-xZnxS (x = 0~1)缓冲层和CIGS吸收层的带隙以获得高效率

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.1016/j.spmi.2021.107100

T. Hossain , M.K. Sobayel , F.T. Munna , S. Islam , H.I. Alkhammash , Khaled Althubeiti , S.M. Jahangir Alam , K. Techato , Md. Akhtaruzzaman , M.J. Rashid

{"title":"Tuning the bandgap of Cd1-xZnxS (x = 0~1) buffer layer and CIGS absorber layer for obtaining high efficiency","authors":"T. Hossain , M.K. Sobayel , F.T. Munna , S. Islam , H.I. Alkhammash , Khaled Althubeiti , S.M. Jahangir Alam , K. Techato , Md. Akhtaruzzaman , M.J. Rashid","doi":"10.1016/j.spmi.2021.107100","DOIUrl":"10.1016/j.spmi.2021.107100","url":null,"abstract":"<div>This numerical study deals with the CIGS solar cell considering Cd1-xZnxS buffer layer. The composition ‘x’ of the buffer layer is determined and its impact on the solar cell performance parameters is studied. The influence of the buffer layer thickness on quantum efficiency is also discussed. The tuned bandgap and optimized thickness of the Cd1-xZnxS buffer layer are then utilized to obtain the suitable bandgap of the CIGS absorber layer. The maximum power conversion zone is revealed in terms of the CIGS bandgap and the impact of this bandgap on spectral response as well as performance parameters are discussed. The Cd0.6Zn0.4S/CIGS interface is studied by varying the defect density from 1010 cm−3 to 1016 cm−3. The cell performances are also analyzed for the temperature ranging from 260 K to 350 K.</div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42747366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

K6Sn4F12I2•0.5H2O: a zero-dimensional alkali metal tin mixed halide compound exhibiting color change due to crystal water loss K6Sn4F12I2•0.5H2O:一种因结晶水损失而变色的零维碱金属锡混合卤化物化合物

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2021.07

P. Gong, S. Luo, Zheshuai Lin

引用次数: 0

Environmental embrittlement behavior of high-entropy alloys 高熵合金的环境脆化行为

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.26

引用次数: 1

An insight into growth transition in AlN epitaxial films produced by metal-organic chemical vapour deposition at different growth temperatures 金属-有机化学气相沉积制备的AlN外延膜在不同生长温度下的生长转变

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.1016/j.spmi.2021.107095

M.A.A.Z. Md Sahar , Z. Hassan , S.S. Ng , N.A. Hamzah , Y. Yusuf , N.N. Novikova , V.A. Yakovlev , S.A. Klimin

{"title":"An insight into growth transition in AlN epitaxial films produced by metal-organic chemical vapour deposition at different growth temperatures","authors":"M.A.A.Z. Md Sahar , Z. Hassan , S.S. Ng , N.A. Hamzah , Y. Yusuf , N.N. Novikova , V.A. Yakovlev , S.A. Klimin","doi":"10.1016/j.spmi.2021.107095","DOIUrl":"10.1016/j.spmi.2021.107095","url":null,"abstract":"<div>This work demonstrates a clear picture growth transition of aluminium nitride (AlN) films from the three-dimensional (3D) to the two-dimensional (2D) regime on the sapphire substrate at various temperatures using metal-organic chemical vapour deposition (MOCVD) under low reactor pressure. The high deposition rate of large 3D AlN islands that isolated each other change to 2D growth mode with a smoother surface as temperature increases from 800 °C to 1340 °C. From x-ray diffraction measurement, the AlN (100), AlN (002), and AlN (101) planes exhibit strong peak monocrystalline AlN (002) films as the temperature increase. It found that the AlN film grew at 1100 °C in the Frank–van der Merwe or 2D growth mode exhibits the highest crystalline quality with the threading dislocation density around 2.21 × 109 cm−2. In addition, the lattice vibrational parameters of the AlN films at 1100 °C shows the lowest phonon damping from IR spectra results. Thus, this study details the AlN epitaxial films growth transition, which is crucial for growing high crystalline quality AlN layer using the MOCVD technique.</div>","PeriodicalId":22044,"journal":{"name":"Superlattices and Microstructures","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44943586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Comprehensive review on electrical noise analysis of TFET structures TFET结构电噪声分析综述

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.1016/j.spmi.2021.107101

Sweta Chander, Sanjeet Kumar Sinha, Rekha Chaudhary

引用次数: 21

Recent advances in two-dimensional van der Waals magnets 二维范德华磁体的最新进展

IF 3.1 3区物理与天体物理

Superlattices and Microstructures Pub Date : 2022-01-01 DOI: 10.20517/microstructures.2022.02

Hang Xu, Shengjie Xu, Xun Xu, J. Zhuang, W. Hao, Yi Du

引用次数: 14

Retraction notice to “Structural, electronic, optical, elastic and thermal properties of CdSnP2 with the application in solar cell devices” [Superlattice. Microst. 85 (2015) 859–871] “CdSnP2的结构、电子、光学、弹性和热性质及其在太阳能电池器件中的应用”[超晶格]的撤回通知。Microst. 85 (2015) 859-871]