Growth of a porous NiCoO2 nanowire network for transparent-to-brownish grey electrochromic smart windows with wide-band optical modulation

2021 ◽  
Author(s):  
Pengyang Lei ◽  
Jinhui Wang ◽  
Ping Zhang ◽  
Shiyou Liu ◽  
Siyu Zhang ◽  
...  
Keyword(s):  
Wide Band ◽  
Optical Modulation ◽  
Smart Windows ◽  
Nanowire Network ◽  
Conductive Substrate

A uniform porous NiCoO2 nanowire film was successfully grown on a transparent conductive substrate for transparent-to-brownish grey electrochromic smart windows with wide-band optical modulation.

A facile way for scalable fabrication of silver nanowire network electrodes for high-performance and foldable smart windows

2020 ◽  
Vol 8 (17) ◽  
pp. 8620-8628
Author(s):  
Shengyun Huang ◽  
Qingzhe Zhang ◽  
Fan Yang ◽  
Deepak Thrithamarassery Gangadharan ◽  
Pandeng Li ◽  
...  
Keyword(s):  
High Performance ◽  
Switching Time ◽  
Silver Nanowire ◽  
Optical Modulation ◽  
Smart Windows ◽  
Nanowire Network

Ag NW TCE based SPDs show high performance (optical modulation 60.2%; switching time 21 s) and excellent flexibility (folded 180°).

Al3+ intercalation/de-intercalation-enabled dual-band electrochromic smart windows with a high optical modulation, quick response and long cycle life

2018 ◽  
Vol 11 (10) ◽  
pp. 2884-2892 ◽  
Author(s):  
Shengliang Zhang ◽  
Sheng Cao ◽  
Tianran Zhang ◽  
Adrian Fisher ◽  
Jim Yang Lee
Keyword(s):  
Fast Response ◽  
Cycle Life ◽  
Dual Band ◽  
Optical Modulation ◽  
Quick Response ◽  
Smart Window ◽  
Smart Windows ◽  
Long Cycle ◽  
Long Cycle Life

An Al3+ intercalation/de-intercalation-enabled dual-band electrochromic smart window featuring simultaneously a high optical modulation, fast response and long cycle life.

scholarly journals Electrochromic Devices Based on Porous Tungsten Oxide Thin Films

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Y. Djaoued ◽  
S. Balaji ◽  
R. Brüning
Keyword(s):  
Thin Films ◽  
Transition Metal Oxides ◽  
Structural Phase ◽  
Phase Changes ◽  
Optical Modulation ◽  
Electrochromic Devices ◽  
Smart Windows ◽  
Porous Thin Films ◽  
Recent Developments ◽  
Ion Intercalation

Recent developments in the synthesis of transition metal oxides in the form of porous thin films have opened up opportunities in the construction of electrochromic devices with enhanced properties. In this paper, synthesis, characterization and electrochromic applications of porous WO3thin films with different nanocrystalline phases, such as hexagonal, monoclinic, and orthorhombic, are presented. Asymmetric electrochromic devices have been constructed based on these porous WO3thin films. XRD measurements of the intercalation/deintercalation of Li+into/from the WO3layer of the device as a function of applied coloration/bleaching voltages show systematic changes in the lattice parameters associated with structural phase transitions in LixWO3. Micro-Raman studies show systematic crystalline phase changes in the spectra of WO3layers during Li+ion intercalation and deintercalation, which agree with the XRD data. These devices exhibit interesting optical modulation (up to ~70%) due to intercalation/deintercalation of Li ions into/from the WO3layer of the devices as a function of applied coloration/bleaching voltages. The obtained optical modulation of the electrochromic devices indicates that, they are suitable for applications in electrochromic smart windows.

scholarly journals Enhanced Electrochromic Properties by Improvement of Crystallinity for Sputtered WO3 Film

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 577
Author(s):  
Zhu-jie Xia ◽  
Hong-li Wang ◽  
Yi-fan Su ◽  
Peng Tang ◽  
Ming-jiang Dai ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Amorphous State ◽  
Xrd Analysis ◽  
Optical Modulation ◽  
Modulation Amplitude ◽  
Cyclic Stability ◽  
Smart Windows ◽  
Electrochromic Properties ◽  
Wo3 Thin Films

Tungsten oxide (WO3) is widely used as a functional material for “smart windows” due to its excellent electrochromic properties, however it is difficult to overcome the conflict between its optical modulation and cyclic stability. In this work, WO3 thin films with different crystal structures were prepared by DC reactive magnetron sputtering method. The effects of substrate temperature on the structure, composition, and electrochromic properties of WO3 films were investigated. The results show that the crystallinity of the WO3 film increases with increasing deposition temperature, indicating that temperature plays an important role in controlling the structure of the WO3 film. For WO3 thin films formed at a substrate temperature of 573 K, the film is in an amorphous state to a crystalline transition state. From X-ray diffraction (XRD) analysis, the thin film showed a weak WO3 crystallization peak, which was in the composite structure of amorphous and nanocrystalline. Which has the best electrochromic properties, with modulation amplitude of 73.1% and bleached state with a coloration efficiency of 42.9 cm2/C at a wavelength of 550 nm. Even after 1500 cycles, the optical modulation still contains 65.4%, delivering the best cyclic stability.

Liquid crystal–Based flexible smart windows on roll-to-roll slot die–Coated Ag nanowire network films

2018 ◽  
Vol 765 ◽  
pp. 1090-1098 ◽  
Author(s):  
Dong-Ju Kim ◽  
Do Yun Hwang ◽  
Jin-Yeong Park ◽  
Han-Ki Kim
Keyword(s):  
Liquid Crystal ◽  
Smart Windows ◽  
Nanowire Network ◽  
Roll To Roll ◽  
Slot Die ◽  
Ag Nanowire

Seven-colour photometry at the Geneva Observatory

1966 ◽  
Vol 24 ◽  
pp. 262-266 ◽  
Author(s):  
M. Golay
Keyword(s):  
Wide Band ◽  
Electric System ◽  
Band Type

During the last 5 years, we have developed a seven-colour photometry at the Geneva Observatory. Our multicolour photo-electric system is of a wide-band type; the bandwidth being about 500Å for four filters. The three others are similar to theUBVsystem. In Table 1 we give the filter combinations used in our photometry (1).

TEM and cathodoluminescence of precipitates in II-VI semiconductors

1988 ◽  
Vol 46 ◽  
pp. 488-489
Author(s):  
Joanna L. Batstone
Keyword(s):  
Crystal Growth ◽  
Band Gap ◽  
Local Strain ◽  
Wide Band ◽  
Optoelectronic Device ◽  
Wide Band Gap ◽  
Bulk Crystal Growth ◽  
Transmission Electron ◽  
Device Applications ◽  
Stoichiometry Control

Interest in II-VI semiconductors centres around optoelectronic device applications. The wide band gap II-VI semiconductors such as ZnS, ZnSe and ZnTe have been used in lasers and electroluminescent displays yielding room temperature blue luminescence. The narrow gap II-VI semiconductors such as CdTe and HgxCd1-x Te are currently used for infrared detectors, where the band gap can be varied continuously by changing the alloy composition x.Two major sources of precipitation can be identified in II-VI materials; (i) dopant introduction leading to local variations in concentration and subsequent precipitation and (ii) Te precipitation in ZnTe, CdTe and HgCdTe due to native point defects which arise from problems associated with stoichiometry control during crystal growth. Precipitation is observed in both bulk crystal growth and epitaxial growth and is frequently associated with segregation and precipitation at dislocations and grain boundaries. Precipitation has been observed using transmission electron microscopy (TEM) which is sensitive to local strain fields around inclusions.

Electron microscopic characterization of diamond thin films and substrates for diamond heteroepitaxial growth

1989 ◽  
Vol 47 ◽  
pp. 592-593
Author(s):  
J.B. Posthill ◽  
R.P. Burns ◽  
R.A. Rudder ◽  
Y.H. Lee ◽  
R.J. Markunas ◽  
...  
Keyword(s):  
Thin Films ◽  
Wide Band ◽  
Deposition Process ◽  
Heteroepitaxial Growth ◽  
Electron Microscopic ◽  
Wide Band Gap ◽  
Lattice Matching ◽  
Different Types ◽  
Diamond Thin Films

Because of diamond’s wide band gap, high thermal conductivity, high breakdown voltage and high radiation resistance, there is a growing interest in developing diamond-based devices for several new and demanding electronic applications. In developing this technology, there are several new challenges to be overcome. Much of our effort has been directed at developing a diamond deposition process that will permit controlled, epitaxial growth. Also, because of cost and size considerations, it is mandatory that a non-native substrate be developed for heteroepitaxial nucleation and growth of diamond thin films. To this end, we are currently investigating the use of Ni single crystals on which different types of epitaxial metals are grown by molecular beam epitaxy (MBE) for lattice matching to diamond as well as surface chemistry modification. This contribution reports briefly on our microscopic observations that are integral to these endeavors.

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