scholarly journals Characterization of inhomogeneous weakly absorbing thin films by photothermal deflection spectroscopy, applications to hydrogenated amorphous silicon films

1994 ◽  
Vol 04 (C7) ◽  
pp. C7-121-C7-124
Author(s):  
L. Chahed ◽  
J. M. Frigerio ◽  
F. Jérémie ◽  
M. L. Thèye
Keyword(s):  
Thin Films ◽  
Amorphous Silicon ◽  
Hydrogenated Amorphous Silicon ◽  
Silicon Films ◽  
Photothermal Deflection Spectroscopy ◽  
Photothermal Deflection ◽  
Hydrogenated Amorphous

Laser crystallization and structural characterization of hydrogenated amorphous silicon thin films

1999 ◽  
Vol 85 (11) ◽  
pp. 7914-7918 ◽  
Author(s):  
D. Toet ◽  
P. M. Smith ◽  
T. W. Sigmon ◽  
T. Takehara ◽  
C. C. Tsai ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Silicon ◽  
Structural Characterization ◽  
Hydrogenated Amorphous Silicon ◽  
Laser Crystallization ◽  
Silicon Thin Films ◽  
Hydrogenated Amorphous

Defects in Hydrogenated Amorphous Silicon Carbide Alloys using Electron Spin Resonance and Photothermal Deflection Spectroscopy

2009 ◽  
Vol 1153 ◽  
Author(s):  
Brian J. Simonds ◽  
Feng Zhu ◽  
Josh Gallon ◽  
Jian Hu ◽  
Arun Madan ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Electron Spin Resonance ◽  
Amorphous Silicon ◽  
Electron Spin ◽  
Carbon Concentration ◽  
Hydrogenated Amorphous Silicon ◽  
Photothermal Deflection Spectroscopy ◽  
Spin Resonance ◽  
Photothermal Deflection ◽  
Hydrogenated Amorphous

AbstractHydrogenated amorphous silicon carbide alloys are being investigated as a possible top photoelectrode in photoelectrochemical cells used for hydrogen production through water splitting. In order to be used as such, it is important that the effects of carbon concentration on bonding, and thus on the electronic and optical properties, is well understood. Electron spin resonance experiments were performed under varying experimental conditions to study the defect concentrations. The dominant defects are silicon dangling bonds. At room temperature, the spin densities varied between 1016 and 1018 spins/cm3 depending on the carbon concentration. Photothermal deflection spectroscopy, which is an extremely sensitive measurement of low levels of absorption in thin films, was performed to investigate the slope of the Urbach tail. These slopes are 78 meV for films containing the lowest carbon concentration and 98 meV for those containing the highest carbon concentration.

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