The role of structural order and stiffness in the simultaneous enhancement of optical contrast and thermal stability in phase change materials

2019 ◽  
Vol 7 (14) ◽  
pp. 4132-4142 ◽  
Author(s):  
Qian Li ◽  
Kaicheng Xu ◽  
Xiaoyi Wang ◽  
Haihua Huang ◽  
Liang Ma ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Photonic Devices ◽  
Optical Contrast ◽  
The Past ◽  
Structural Order ◽  
Perfect Absorbers

In the past several years, phase change materials (PCMs) have been widely applied in energy-saving non-volatile photonic devices, such as active perfect absorbers, nanopixel displays and all-photonic memories.

The Role of Si and Sb in the Si-Sb-Te Phase-change Material

2011 ◽  
Vol 1295 ◽  
Author(s):  
Liangcai Wu ◽  
Xilin Zhou ◽  
Zhitang Song ◽  
Henan Ni ◽  
Feng Rao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phase Change ◽  
Phase Change Materials ◽  
Crystallization Process ◽  
Cmos Technology ◽  
Data Retention ◽  
Si Content ◽  
Device Properties ◽  
Change Material

ABSTRACTSb-rich Si-Sb-Te phase change materials with different Si contents were proposed and fabricated, and the role of Si and Sb in the Si-Sb-Te alloys was discussed. The resistance-temperature and retention properties of the Sb-rich Si-Sb-Te alloys were studied. Devices based on the Sb-rich Si-Sb-Te alloys were fabricated by a 0.18 μm CMOS technology and device properties were studied by pulsed mode resistance-voltage (R-V) measurements. Experimental results show that the crystallization temperature and data retention ability of the Sb-rich Si-Sb-Te alloys were obviously improved with increasing Si content, but the electrical properties degenerate if too much Si was added. Sb is helpful to promote the crystallization process, but excessive Sb decreases the thermal stability. So, in order to obtain practicable Sb-rich Si-Sb-Te phase change materials, suitable Si and Sb contents are required to balance the device performances between electrical switching property and thermal stability or data retention ability.

Inorganic Phase Change Materials in Building Energy Saving

2011 ◽  
Vol 71-78 ◽  
pp. 2606-2609
Author(s):  
Xue Lu Li ◽  
Lei Zhang ◽  
Shi Qiang Wang ◽  
Ya Fei Guo ◽  
Tian Long Deng
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Building Energy ◽  
The Past ◽  
The Future ◽  
Building Energy Saving

The applications of inorganic phase change materials (PCMs) in building energy saving have been investigated within the past decades. In this paper, the contents of operative principles of applying inorganic PCMs in buildings, incorporation methods, and its applications in building energy saving in the fields of PCM wallboards, floors, and roofs and so on were summarized in details. Finally, some problems and new trends in the future are also discussed.

scholarly journals Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Fluids ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 275
Author(s):  
Ahmed J. Hamad
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Air Temperature ◽  
Temperature Control ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Heating System ◽  
Air Heating ◽  
Room Model ◽  
Model Temperature

One essential utilization of phase change materials as energy storage materials is energy saving and temperature control in air conditioning and indirect solar air drying systems. This study presents an experimental investigation evaluating the characteristics and energy savings of multiple phase change materials subjected to internal flow in an air heating system during charging and discharging cycles. The experimental tests were conducted using a test rig consisting of two main parts, an air supply duct and a room model equipped with phase change materials (PCMs) placed in rectangular aluminum panels. Analysis of the results was based on three test cases: PCM1 (Paraffin wax) placed in the air duct was used alone in the first case; PCM2 (RT–42) placed in the room model was used alone in the second case; and in the third case, the two PCMs (PCM1 and PCM2) were used at the same time. The results revealed a significant improvement in the energy savings and room model temperature control for the air heating system incorporated with multiple PCMs compared with that of a single PCM. Complete melting during the charging cycle occurred at temperatures in the range of 57–60 °C for PCM1 and 38–43 °C for PCM2, respectively, thereby validating the reported PCMs’ melting–solidification results. Multiple PCMs maintained the room air temperature at the desired range of 35–45.2 °C in the air heating applications by minimizing the air temperature fluctuations. The augmentation in discharging time and improvement in the room model temperature using multiple PCMs were about 28.4% higher than those without the use of PCMs. The total energy saving using two PCMs was higher by about 29.5% and 46.7% compared with the use of PCM1 and PCM2, respectively. It can be concluded that multiple PCMs have revealed higher energy savings and thermal stability for the air heating system considered in the current study.

New techniques for the energy saving of sustainable buildings by using phase change materials

2021 ◽  
Vol 41 ◽  
pp. 102418
Author(s):  
Ashraf Mohamed Heniegal ◽  
Omar Mohamed Omar Ibrahim ◽  
Nour Bassim Frahat ◽  
Mohamed Amin
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Phase Change Materials ◽  
Sustainable Buildings ◽  
New Techniques

scholarly journals Phase Change Metasurfaces by Continuous or Quasi-Continuous Atoms for Active Optoelectronic Integration

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1272
Author(s):  
Zhihua Fan ◽  
Qinling Deng ◽  
Xiaoyu Ma ◽  
Shaolin Zhou
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Complementary Metal Oxide Semiconductor ◽  
Photonic Devices ◽  
Oxide Semiconductor ◽  
Cmos Process ◽  
Nanophotonic Devices ◽  
Optoelectronic Integration ◽  
Hybrid Devices ◽  
Micro Electromechanical System

In recent decades, metasurfaces have emerged as an exotic and appealing group of nanophotonic devices for versatile wave regulation with deep subwavelength thickness facilitating compact integration. However, the ability to dynamically control the wave–matter interaction with external stimulus is highly desirable especially in such scenarios as integrated photonics and optoelectronics, since their performance in amplitude and phase control settle down once manufactured. Currently, available routes to construct active photonic devices include micro-electromechanical system (MEMS), semiconductors, liquid crystal, and phase change materials (PCMs)-integrated hybrid devices, etc. For the sake of compact integration and good compatibility with the mainstream complementary metal oxide semiconductor (CMOS) process for nanofabrication and device integration, the PCMs-based scheme stands out as a viable and promising candidate. Therefore, this review focuses on recent progresses on phase change metasurfaces with dynamic wave control (amplitude and phase or wavefront), and especially outlines those with continuous or quasi-continuous atoms in favor of optoelectronic integration.

scholarly journals The role of phase change materials for the sustainable energy

2016 ◽  
Vol 10 ◽  
pp. 00068 ◽  
Author(s):  
Marta Kuta ◽  
Dominika Matuszewska ◽  
Tadeusz Michał Wójcik
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Sustainable Energy

Phase Change Materials - From Structures to Kinetics

2006 ◽  
Vol 918 ◽  
Author(s):  
Matthias Wuttig ◽  
Wojciech Welnic ◽  
Ralf Detemple ◽  
Henning Dieker ◽  
Johannes Kalb ◽  
...  
Keyword(s):  
Phase Change ◽  
Crystalline State ◽  
Phase Change Materials ◽  
Amorphous State ◽  
Structural Difference ◽  
Fast Time ◽  
Optical Contrast ◽  
Fast Time Scale ◽  
Kinetics Of ◽  
Structure Properties

AbstractPhase change materials possess a unique combination of properties which include a pronounced property contrast between the amorphous and crystalline state, i.e. a high electrical and optical contrast. In particular the latter observation is indicative for a considerable structural difference between the amorphous and crystalline state. At the same time the crystallization of the amorphous state proceeds on a fast time scale. This raises the question how structure, properties and kinetics are related in phase change alloys. It will be demonstrated that only a small group of covalent semiconductors with octahedral-like coordination has the required property combination. This is related to their thermodynamic properties which govern the kinetics of crystallization.

scholarly journals Photonic Devices: Plasmonic Metasurfaces for Switchable Photonic Spin-Orbit Interactions Based on Phase Change Materials (Adv. Sci. 10/2018)

2018 ◽  
Vol 5 (10) ◽  
pp. 1870063
Author(s):  
Ming Zhang ◽  
Mingbo Pu ◽  
Fei Zhang ◽  
Yinghui Guo ◽  
Qiong He ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Photonic Devices ◽  
Spin Orbit ◽  
Spin Orbit Interactions
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