Visualization of halide perovskite crystal growth processes by in situ heating WAXS measurements

2021 ◽  
Author(s):  
Yuiga Nakamura ◽  
Naoyuki Shibayama ◽  
Kunihisa Sugimoto
Keyword(s):  
Crystal Growth ◽  
Growth Processes ◽  
Perovskite Crystal ◽  
Crystallization Dynamics ◽  
In Situ Heating ◽  
Halide Perovskite

We observed the crystallization dynamics of halide perovskite crystals (CH3NH3PbI3) by in situ heating WAXS measurements.

In situ kinetic investigations during aluminium nitride purification and crystal growth processes by capillary coupled mass spectrometry

2011 ◽  
Vol 526 (1-2) ◽  
pp. 213-221 ◽  
Author(s):  
C. Guguschev ◽  
E. Moukhina ◽  
J. Wollweber ◽  
A. Dittmar ◽  
K. Böttcher ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Crystal Growth ◽  
Aluminium Nitride ◽  
Growth Processes ◽  
Kinetic Investigations

In Situ Heating Device for Real Time X-Ray Topography on Crystal Growth from the Melt

1984 ◽  
Vol 23 (Part 2, No. 8) ◽  
pp. L632-L634 ◽  
Author(s):  
Tatsumasa Kobayashi ◽  
Toru Imura
Keyword(s):  
Crystal Growth ◽  
Real Time ◽  
X Ray ◽  
Heating Device ◽  
In Situ Heating

High-Resolution Dynamic Analysis of the Phase Transformation in Ge2Sb2Te5 Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 1199-1202
Author(s):  
Se Ahn Song ◽  
Wei Zhang ◽  
Hong Sik Jeong ◽  
Jin Gyu Kim ◽  
Youn Joong Kim
Keyword(s):  
Phase Transformation ◽  
Crystal Growth ◽  
High Resolution ◽  
Large Scale ◽  
Voltage Electron ◽  
Transmission Electron ◽  
In Situ Heating ◽  
First Time ◽  
Crystal Growth Behavior

Phase transformation and crystal growth behavior of Ge2Sb2Te5 were investigated systematically by means of in situ heating (from room temperature to 500 oC) of amorphous Ge2Sb2Te5 alloy in a high voltage electron microscope with real-time monitoring. Large-scale crystallization occurred to amorphous Ge2Sb2Te5 around 200 oC. Large crystal growth developed on heating from 200 oC to 400 oC, and single crystalline grains grew up to 150 nm. Eventually the onset of partial melting of thin Ge2Sb2Te5 foil was at 500 oC and liquid Ge2Sb2Te5 was observed for the first time by high-resolution transmission electron microscopy. Hexagonal Ge2Sb2Te5 phase remains after a subsequent cooling.

IN-SITU DIAGNOSIS AND CONTROL OF CRYSTAL GROWTH PROCESS BY MEANS OF ELECTRIC POTENTIALS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4373-4379
Author(s):  
E. G. TSVETKOV ◽  
V. I. TYURIKOV
Keyword(s):  
Crystal Growth ◽  
Crystallization Rate ◽  
Growth Period ◽  
Double Electric Layer ◽  
Temperature Phase ◽  
Growth Processes ◽  
Electric Potentials ◽  
The Difference ◽  
Current Monitoring

The paper discussed a possibility of using new approaches for in-situ diagnosis growth processes of large crystals as well as solving some specific problems of controlling them. They are based on the current monitoring of changes in the differences of electric potential between growing crystals and crystallization medium. It is obvious that this monitoring reflects such important crystallization processes as accumulation of charge at the crystal interface and electric screening of it, growth of concentration of subphase formation at the interface (later, inclusions), current change in the mass crystallization rate, etc. This change in the rate suggests a new concept of automation of crystal growth processes, based on minimization of the difference in the current and initially predetermined change in Δϕ through inversely-related adjustment of the temperature of crystallization medium. We have experimentally substantiated the possibility of using various outer electric potentials for modification of processes in a double electric layer at the interface and extension of growth period under fairly favorable conditions. The system of low-temperature phase of barium metaborate crystal and molten solution as crystallization medium was taken for a model one.

scholarly journals Controlling Metal Halide Perovskite Crystal Growth via Microcontact Printed Hydrophobic‐Hydrophilic Templates

2021 ◽  
pp. 2100121
Author(s):  
Zekarias Teklu Gebremichael ◽  
Shahidul Alam ◽  
Nicola Cefarin ◽  
Alessandro Pozzato ◽  
Teketel Yohannes ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Metal Halide ◽  
Metal Halide Perovskite ◽  
Perovskite Crystal ◽  
Halide Perovskite

scholarly journals Crystal Growth Behaviors of Silicon during Melt Growth Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Kozo Fujiwara
Keyword(s):  
Solar Cells ◽  
Crystal Growth ◽  
Growth Mechanisms ◽  
Morphological Transformation ◽  
Growth Processes ◽  
Melt Growth ◽  
Fine Control ◽  
Faceted Dendrite

It is imperative to improve the crystal quality of Si multicrystal ingots grown by casting because they are widely used for solar cells in the present and will probably expand their use in the future. Fine control of macro- and microstructures, grain size, grain orientation, grain boundaries, dislocation/subgrain boundaries, and impurities, in a Si multicrystal ingot, is therefore necessary. Understanding crystal growth mechanisms in melt growth processes is thus crucial for developing a good technology for producing high-quality Si multicrystal ingots for solar cells. In this review, crystal growth mechanisms involving the morphological transformation of the crystal-melt interface, grain boundary formation, parallel-twin formation, and faceted dendrite growth are discussed on the basis of the experimental results of in situ observations.

Influence of ion-milling on the T2 phase in Al-2.5%Li-2.5%Cu alloy

1989 ◽  
Vol 47 ◽  
pp. 288-289
Author(s):  
J. R. Reed ◽  
D. J. Michel ◽  
P. R. Howell
Keyword(s):  
Thin Foil ◽  
Icosahedral Symmetry ◽  
Ion Milling ◽  
Cu Alloy ◽  
Thin Foils ◽  
Heat Treated ◽  
Aluminum Solid Solution ◽  
In Situ Heating ◽  
The Stability

The Al6Li3Cu (T2) phase, which exhibits five-fold or icosahedral symmetry, forms through solid state precipitation in dilute Al-Li-Cu alloys. Recent studies have reported that the T2 phase transforms either during TEM examination of thin foils or following ion-milling of thin foil specimens. Related studies have shown that T2 phase transforms to a microcrystalline array of the TB phase and a dilute aluminum solid solution during in-situ heating in the TEM. The purpose of this paper is to report results from an investigation of the influence of ion-milling on the stability of the T2 phase in dilute Al-Li-Cu alloy.The 3-mm diameter TEM disc specimens were prepared from a specially melted Al-2.5%Li-2.5%Cu alloy produced by conventional procedures. The TEM specimens were solution heat treated 1 h at 550°C and aged 1000 h at 190°C in air to develop the microstructure. The disc specimens were electropolished to achieve electron transparency using a 20:80 (vol. percent) nitric acid: methanol solution at -60°C.

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