Crystals: Growth Methods and Characterization

1991 ◽  
pp. 559-576
Author(s):  
A. Scacco
Keyword(s):  
Growth Methods

scholarly journals Non-isothermal phase-field simulations of laser-written in-plane SiGe heterostructures for photonic applications

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ozan Aktas ◽  
Yuji Yamamoto ◽  
Mehmet Kaynak ◽  
Anna C. Peacock
Keyword(s):  
Quantum Wells ◽  
Phase Field ◽  
Silicon Germanium ◽  
Phase Segregation ◽  
Layer By Layer ◽  
Beam Position ◽  
Graded Index ◽  
Semiconductor Alloy ◽  
Scan Speed ◽  
Growth Methods

AbstractAdvanced solid-state devices, including lasers and modulators, require semiconductor heterostructures for nanoscale engineering of the electronic bandgap and refractive index. However, existing epitaxial growth methods are limited to fabrication of vertical heterostructures grown layer by layer. Here, we report the use of finite-element-method-based phase-field modelling with thermocapillary convection to investigate laser inscription of in-plane heterostructures within silicon-germanium films. The modelling is supported by experimental work using epitaxially-grown Si0.5Ge0.5 layers. The phase-field simulations reveal that various in-plane heterostructures with single or periodic interfaces can be fabricated by controlling phase segregation through modulation of the scan speed, power, and beam position. Optical simulations are used to demonstrate the potential for two devices: graded-index waveguides with Ge-rich (>70%) cores, and waveguide Bragg gratings with nanoscale periods (100–500 nm). Periodic heterostructure formation via sub-millisecond modulation of the laser parameters opens a route for post-growth fabrication of in-plane quantum wells and superlattices in semiconductor alloy films.

Effects of Crystal Growth Methods on Deep-Level Defects and Electrical Properties of CdZnTe:In Crystals

2014 ◽  
Vol 44 (1) ◽  
pp. 518-523 ◽  
Author(s):  
Lingyan Xu ◽  
Wanqi Jie ◽  
Boru Zhou ◽  
Xu Fu ◽  
Gangqiang Zha ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Electrical Properties ◽  
Deep Level ◽  
Growth Methods

Opportunities for organocatalysis in polymer synthesis via step-growth methods

2019 ◽  
Vol 90 ◽  
pp. 164-210 ◽  
Author(s):  
Amaury Bossion ◽  
Katherine V. Heifferon ◽  
Leire Meabe ◽  
Nicolas Zivic ◽  
Daniel Taton ◽  
...  
Keyword(s):  
Polymer Synthesis ◽  
Step Growth ◽  
Growth Methods

scholarly journals Organic Cocrystals: Recent Advances and Perspectives for Electronic and Magnetic Applications

2021 ◽  
Vol 9 ◽  
Author(s):  
Mengjia Jiang ◽  
Chun Zhen ◽  
Shuyu Li ◽  
Xiaotao Zhang ◽  
Wenping Hu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Research Interest ◽  
Comprehensive Understanding ◽  
Electronic And Magnetic Properties ◽  
Recent Advances ◽  
Magnetic Applications ◽  
Application Fields ◽  
Growth Methods

Cocrystal engineering is an advanced supramolecular strategy that has attracted a lot of research interest. Many studies on cocrystals in various application fields have been reported, with a particular focus on the optoelectronics field. However, few articles have combined and summarized the electronic and magnetic properties of cocrystals. In this review, we first introduce the growth methods that serve as the basis for realizing the different properties of cocrystals. Thereafter, we present an overview of cocrystal applications in electronic and magnetic fields. Some functional devices based on cocrystals are also introduced. We hope that this review will provide researchers with a more comprehensive understanding of the latest progress and prospects of cocrystals in electronic and magnetic fields.

Hole gas accumulation in Si/Ge core–shell and Si/Ge/Si core–double shell nanowires

Nanoscale ◽  
2018 ◽  
Vol 10 (45) ◽  
pp. 21062-21068 ◽  
Author(s):  
Xiaolong Zhang ◽  
Wipakorn Jevasuwan ◽  
Ken C. Pradel ◽  
Thiyagu Subramani ◽  
Toshiaki Takei ◽  
...  
Keyword(s):  
Hole Mobility ◽  
Core Shell ◽  
High Electron ◽  
Electron Hole ◽  
Vapor Liquid Solid ◽  
Selective Doping ◽  
Sharp Interfaces ◽  
Growth Methods ◽  
Vapor Liquid Solid Growth ◽  
Shell Nanowires

p-Si/i-Ge core–shell and p-Si/i-Ge/p-Si core–double shell nanowires are fabricated using CVD with vapor–liquid–solid growth methods. Selective doping and sharp interfaces between the Si core and the Ge shell are achieved, which can provide a feasible design for realizing high electron (hole) mobility transistors.

scholarly journals Tele-Oncology: A Validation Study of Choroidal and Iris Nevi

2018 ◽  
Vol 5 (4) ◽  
pp. 298-302 ◽  
Author(s):  
Kelsey Roelofs ◽  
Ezekiel Weis
Keyword(s):  
Positive Predictive Value ◽  
Standardized Tests ◽  
Clinical Examination ◽  
Validation Study ◽  
Predictive Value ◽  
Primary Study ◽  
Standard Testing ◽  
Common Diagnosis ◽  
Sensitivity Specificity ◽  
Growth Methods

Background/Aims: To evaluate teleophthalmological assessment of choroidal and iris nevi (tele-oncology) compared to traditional in-person clinical evaluation for detection of either axial or basal growth. Methods: This is a validation study. All 97 eyes of 99 patients were evaluated with an in-person ocular oncology visit utilizing standard testing, and subsequently had a tele-oncology evaluation with the standardized tests. The tele-oncology reviewer was blinded to the in-person examination findings. The primary study outcome was detection of nevus growth on tele-oncology compared to in-person clinical examination. Results: Patients had a mean age of 61 years and the majority had nevi located in the choroid (n = 87; 88%). The most common diagnosis was a low-risk nevus (n = 38; 44%). By tele-oncology assessment, 11 eyes showed growth. Ten of these patients had growth confirmed on in-person clinical examination. Resultantly, tele-oncology assessment of choroidal and iris nevi growth had a sensitivity of 100%, specificity of 99%, positive predictive value (PPV) of 91%, and negative predictive value (NPV) of 100%. Conclusions: The results of this study suggest that tele-oncology is a safe platform for monitoring choroidal and iris nevi for growth, with excellent sensitivity, specificity, PPV, and NPV.

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