Silicon Carbon Alloys Produced by VHF and Conventional PECVD. A Comparison of their Properties.

1994 ◽  
Vol 336 ◽  
Author(s):  
G. Crovini ◽  
F. Demichelis ◽  
C.F. Pirri ◽  
E. Tresso ◽  
J. Meier ◽  
...  
Keyword(s):  
High Frequency ◽  
Urbach Energy ◽  
Energy Gap ◽  
Very High Frequency ◽  
Hydrogen Dilution ◽  
Deposition Parameters ◽  
Silicon Carbon ◽  
Defect Densities ◽  
Very High

ABSTRACTThe Very High Frequency (70 MHz) PECVD has recently proven its ability to produce Amorphous silicon with high deposition rates (10 Å/s) without affecting the quality of the Material. A comparative study of the optoelectronic properties of undoped silicon carbon alloys produced by Very High Frequency and by conventional RF (13.56 MHz) is carried out. Conductivity, infrared absorption, optical transmission and deep defect densities via PDS and ESR have been Measured. Deposition parameters under study aie methane fraction and hydrogen dilution. In contrast to conventional PECVD, we observe for VHF depositions an increase of the deposition rate with the addition of Methane. Larger energy gap and smaller Urbach energy values seem to indicate a better incorporation of carbon in the VHF case. A study of the degradation induced by light is also presented.

Nanocrystalline Silicon Films Grown at High Pressure in Very High Frequency Plasma Enhanced Chemical Vapor Deposition System

2010 ◽  
Vol 663-665 ◽  
pp. 1171-1174 ◽  
Author(s):  
Yan Qing Guo ◽  
Rui Huang ◽  
Jie Song ◽  
Xiang Wang ◽  
Yi Xiong Zhang
Keyword(s):  
High Pressure ◽  
Vapor Deposition ◽  
High Frequency ◽  
Chemical Vapor ◽  
Nanocrystalline Silicon ◽  
Silicon Films ◽  
Very High Frequency ◽  
Hydrogen Dilution ◽  
Very High ◽  
Nanocrystalline Silicon Films

Nanocrystalline silicon films have been fabricated from SiH4 diluted with H2 in very high frequency (40.68 MHz) plasma enhanced chemical vapor deposition system at low temperatures (250oC). The influence of pressure on the structural properties of nanocrystalline silicon films has been investigated. The experimental results reveal that a very high hydrogen dilution is needed to crystallize the film grown at high pressure. If the hydrogen dilution is not high enough, the film could also be crystallized through lowering the pressure. Furthermore, the crystallinity and grain size increase with decreasing the pressure. These results could be attributed to the increase of ion bombardment energy and the higher atomic hydrogen flux toward the growing film surface at lower pressures.

Large Grain Size and High Deposition Rate for Microcrystalline Silicon Prepared by VHF-GD

1994 ◽  
Vol 358 ◽  
Author(s):  
P. Hapke ◽  
F. Finger ◽  
M. Luysberg ◽  
R. Carius ◽  
H. Wagner
Keyword(s):  
Grain Size ◽  
Deposition Rate ◽  
High Frequency ◽  
Excitation Frequency ◽  
Chemical Vapour ◽  
High Deposition Rate ◽  
Very High Frequency ◽  
Deposition Parameters ◽  
Plasma Excitation ◽  
Very High

ABSTRACTThe growth mechanism and material properties of -type µc-Si:H prepared with plasma enhanced chemical vapour deposition in the very high frequency range is investigated. By increasing the plasma excitation frequency the grain size, deposition rate and Hall mobility can be simultaneously increased without having to adjust other deposition parameters in particular the temperature. This effect is explained by an enhanced selective etching of amorphous tissue and grain boundary regions together with a sufficient supply of growth species at high frequency plasmas.

Structural, Optical and Electrical Properties of μc-SiC:H Thin Films Deposited by the VHF-GD

1994 ◽  
Vol 358 ◽  
Author(s):  
Roger Fluckiger ◽  
J. Meier ◽  
A. Shah ◽  
J. Pohl ◽  
M. Tzolov ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Gas Phase ◽  
High Frequency ◽  
Input Power ◽  
Optical And Electrical Properties ◽  
Very High Frequency ◽  
Deposition Parameters ◽  
Temperature And Pressure ◽  
The Individual ◽  
Very High

ABSTRACTIn the present paper the authors present new results on thin (μc-SiC:H films deposited at low temperatures by the Very High Frequency - Glow Discharge technique (VHF-GD) at 70 MHz. The individual effects of each of the deposition parameters (methane and diborane gas phase ratios, input power, deposition temperature and pressure) are investigated with respect to the structural, optical and electrical properties of the films; the goal being the growth of optimised, thin μc-SiC:H layers for use as highly conductive and high gap window layers in solar cells.

Development of p-type microcrystalline silicon carbon alloy films by the very high frequency plasma-enhanced chemical vapor deposition technique

2001 ◽  
Vol 16 (7) ◽  
pp. 2130-2135
Author(s):  
Tapati Jana ◽  
Arup Dasgupta ◽  
Swati Ray
Keyword(s):  
Substrate Temperature ◽  
High Frequency ◽  
Excitation Frequency ◽  
Deposition Technique ◽  
Very High Frequency ◽  
Silicon Carbon ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Plasma Excitation ◽  
Very High

We developed p-type μc-silicon carbon alloy thin films by the very high frequency plasma-enhanced chemical vapour deposition technique using a SiH4, H2, CH4, and B2H6 gas mixture at low power (55 mW/cm2) and low substrate temperatures (150–250 °C). Effects of substrate temperature and plasma excitation frequency on the optoelectronic and structural properties of the films were studied. A film with conductivity 5.75 Scm−1 and 1.93 eV optical gap (E04) was obtained at a low substrate temperature of 200 °C using 63.75 MHz plasma frequency. The crystalline volume fractions of the films were estimated from the Raman spectra. We observed that crystallinity in silicon carbon alloy films depends critically on plasma excitation frequency. When higher power (117 mW/cm2) at 180 °C with 66 MHz frequency was applied, the deposition rate of the film increased to 50.7 Å/min without any significant change in optoelectronic properties.

Preparation and Characterization of Highly Conductive (100 S/cm) Phosphorus Doped νc-Si:H Films Deposited Using the VHF-GD Technique

1989 ◽  
Vol 164 ◽  
Author(s):  
Kshem Prasad ◽  
F. Finger ◽  
H. Curtins ◽  
A. Shah ◽  
J. Bauman
Keyword(s):  
Excitation Frequency ◽  
Very High Frequency ◽  
Hydrogen Dilution ◽  
Deposition Parameters ◽  
Plasma Excitation ◽  
Phosphorus Doped ◽  
Power Densities ◽  
Very High ◽  
Doping Ratio

AbstractWe report on the preparation and characterization of phosphorus doped gc-Si:H films produced by the very high frequency glow discharge (VHF-GD) at a plasma excitation frequency of 70 MHz. We present a systematic study of the deposition parameters i.e. hydrogen dilution of silane, VHF power density, gas phase doping ratio and deposition temperature and their influences on the electrical and structural properties of the material. In contrast to 13.56 MHz GD the VHF plasma conditions favour microcrystalline formation at low power densities; the resulting conductivities are significantly higher than those obtained at 13.56 MHz.

Wide band-gap silicon-carbon alloys deposited by very high frequency plasma enhanced chemical vapor deposition

2004 ◽  
Vol 96 (7) ◽  
pp. 3987-3997 ◽  
Author(s):  
C. Summonte ◽  
R. Rizzoli ◽  
M. Bianconi ◽  
A. Desalvo ◽  
D. Iencinella ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
High Frequency ◽  
Chemical Vapor ◽  
Wide Band ◽  
Very High Frequency ◽  
Wide Band Gap ◽  
Silicon Carbon ◽  
High Frequency Plasma ◽  
Frequency Plasma ◽  
Very High
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