Raman and Ft‐Ir Study on Structure and Its Stability of Hydrogenated Amorphous Germanium‐Nitrogen Alloys

1996 ◽  
Vol 446 ◽  
Author(s):  
Jun Xu ◽  
Kunji Chen ◽  
Duan Feng ◽  
Seiichi Miyazaki ◽  
Masataka Hirose
Keyword(s):  
Thermal Stability ◽  
Fourier Transform ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Amorphous Germanium ◽  
Ft Ir ◽  
Ir Study ◽  
Hydrogenated Amorphous ◽  
Hydrogenated Amorphous Germanium ◽  
Infrared Techniques

AbstractA series of hydrogenated amorphous germanium‐nitrogen (a‐GeN:H) alloys have been synthesized by plasma enhanced chemical vapor deposition. The structure and its thermal stability have been investigated by means of Raman Scattering and Fourier Transform Infrared techniques. It was found that the structure is changed from Ge‐Ge‐like to Ge‐N‐like when the nitrogen content x in a‐Ge1‐xNx:H is larger than 0.3. Some a‐GeN:H alloys were annealed for 30min at different temperature and it is shown that the film structural stability is significantly improved compared with pure a‐Ge:H film.

Hydrogen Stability in Hydrogenated Amorphous Germanium

1990 ◽  
Vol 192 ◽  
Author(s):  
W. Beyer ◽  
J. Herion ◽  
H. Wagner ◽  
U. Zastrow
Keyword(s):  
Thermal Stability ◽  
Fermi Level ◽  
Hydrogen Evolution ◽  
Film Structure ◽  
Amorphous Germanium ◽  
Germanium Films ◽  
Hydrogenated Amorphous ◽  
Hydrogenated Amorphous Germanium ◽  
Thermal Stability Of

ABSTRACTThe thermal stability of hydrogen in hydrogenated amorphous germanium films was studied by hydrogen evolution and by deuterium and hydrogen inter-diffusion experiments. Similar to a-Si:H, the hydrogen stability in a-Ge:H is found to depend strongly on the film structure and on the position of the Fermi level.

Uncooled microbolometers with hydrogenated amorphous germanium-silicon films: Different device configurations and improvements on the thermosensing films

2012 ◽  
Vol 1437 ◽  
Author(s):  
Mario Moreno ◽  
Alfonso Torres ◽  
Roberto Ambrosio ◽  
Pedro Rosales ◽  
Andrey Kosarev ◽  
...  
Keyword(s):  
Defect Density ◽  
Chemical Vapor ◽  
Performance Characteristics ◽  
Thermal Coefficient ◽  
Amorphous Germanium ◽  
Boron Doped ◽  
Thermal Coefficient Of Resistance ◽  
Germanium Silicon ◽  
Hydrogenated Amorphous ◽  
Hydrogenated Amorphous Germanium

ABSTRACTWe report our main results on the development of un-cooled microbolometers based on hydrogenated amorphous Germanium-Silicon (a-GexSiy:H) thermo-sensing films deposited by Plasma Enhanced Chemical Vapor Deposition (PECVD). Our research has been conducted to improve both, the structure of the devices (pixels) and the performance characteristics of the amorphous Germanium-Silicon thermosensing films.Our motivation is to produce microbolometers with much better performance characteristics (larger thermal coefficient of resistance, larger conductivity and better stability) than those available in commercial microbolometer arrays, based on boron doped hydrogenated amorphous silicon (a-Si:H,B).As part of our latest research, we also report the study of what we believe is the next generation of thermosensing films based on Silicon and Geranium amorphous films with embedded nanocrystals in the amorphous matrix (polymorphous films). Those materials have several advantages over amorphous, as a lower defect density, better stability and better transport properties.

Comparative studies of the influence of hydrogen incorporation on the electronic properties of a-Ge:H films prepared by two different techniques

2000 ◽  
Vol 77 (9) ◽  
pp. 659-666
Author(s):  
Y Bouizem ◽  
J D Sib ◽  
L Chahed ◽  
M L Thèye
Keyword(s):  
Optical Absorption ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Localized States ◽  
Optical Absorption Spectra ◽  
Defect States ◽  
Hydrogen Incorporation ◽  
Gap States ◽  
Hydrogenated Amorphous ◽  
Hydrogenated Amorphous Germanium

We present the results of a detailed investigation of hydrogen incorporation and optical absorption in the 0.6-1.3 eV range for two series of hydrogenated amorphous germanium films (a-Ge:H) deposited by reactive sputtering (series A) and by plasma-enhanced chemical vapor deposition from germane (series B). Our results clearly show that the series A samples are characterized by a larger bonded hydrogen concentration (CH), a more rapid gap variation with increasing CH, a smaller refractive index, and a lower density than the series B samples. We also compare in detail the energy distribution of the localized states in the pseudo-gap and the deep-defect states density as deduced from a decomposition of the optical absorption spectra based on a theoretical model for the gap states density in amorphous tetracoordinated semiconductors.PACS No.: 71.90

Effects of Preparation and Thermal Stability on Hydrogenated Amorphous Carbon Films by Microwave Plasma Chemical Vapor Deposition

2014 ◽  
Vol 1048 ◽  
pp. 378-382
Author(s):  
Hai Ying Xu ◽  
Cai Xia Kan ◽  
Feng Ming Pan ◽  
Chang Zong Miao
Keyword(s):  
Thermal Stability ◽  
Chemical Vapor Deposition ◽  
Amorphous Carbon ◽  
Vapor Deposition ◽  
Microwave Plasma ◽  
Chemical Vapor ◽  
Plasma Chemical ◽  
Hydrogenated Amorphous Carbon ◽  
Plasma Chemical Vapor Deposition ◽  
Hydrogenated Amorphous

Hydrogenated amorphous carbon (a-C:H) films were prepared by microwave plasma chemical vapor deposition (MW-PCVD) technique with a mixture of acetylene and hydrogen. The morphology of three-phase a-C:H films, such as graphite-like, diamond-like and polymer-like were modulated by microwave power, deposition pressure, and flow ratios. Meanwhile, annealing does not seem to change the surface morphology or the film structure. The phase transitions are not found during the different annealing temperatures, showing that a-C:H films have a good thermal stability.

Growth of Carbon Fibers from Copper Dendrite Nanostructures Catalyzed Decomposition of Acetylene

2012 ◽  
Vol 465 ◽  
pp. 101-107 ◽  
Author(s):  
Cong Zhang ◽  
Fang Lin Du
Keyword(s):  
Thermal Stability ◽  
Fourier Transform ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Growth Time ◽  
Catalyst Morphology ◽  
The Impact ◽  
Thermal Stability Of

Carbon nanofibers with novel morphology are successfully synthesized by the chemical vapor deposition of acetylene with dendritic copper nanocrystals on Cu electrode as a catalyst. Growth mechanism of sandwich-like and multi-branched carbon fibers is discussed, and the impact of catalyst morphology and growth time on the structure of the carbon nanofibers is investigated. The organic groups and the thermal stability of the as-prepared carbon nanofibers are revealed by Fourier transform infrared spectrum (IR) and thermogravimetric (TG) analysis.

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