Interband optical absorption in amorphous semiconductors

1984 ◽  
Author(s):  
Morrel H. Cohen ◽  
Costas M. Soukoulis ◽  
E. N. Economou
Keyword(s):  
Optical Absorption ◽  
Amorphous Semiconductors

Optical absorption in amorphous semiconductors

1985 ◽  
Vol 77-78 ◽  
pp. 171-174 ◽  
Author(s):  
M.H. Cohen ◽  
C.M. Soukoulis ◽  
E.N. Economou
Keyword(s):  
Optical Absorption ◽  
Amorphous Semiconductors

On the Origin of the Urbach Rule and the Urbach Focus

2013 ◽  
Vol 1536 ◽  
pp. 139-145 ◽  
Author(s):  
J. A. Guerra ◽  
L. Montañez ◽  
F. De Zela ◽  
A. Winnacker ◽  
R. Weingärtner
Keyword(s):  
Optical Absorption ◽  
Amorphous Semiconductors ◽  
Absorption Process ◽  
Exponential Tail ◽  
Simple Derivation ◽  
Exponential Tails ◽  
Average Transition ◽  
Theoretical Results ◽  
Experimental Absorption ◽  
Phonon Model

ABSTRACTA simple derivation of sub-bandgap exponential tails and fundamental absorption equations ruling the optical absorption of amorphous semiconductors are presented following the frozen phonon model. We use the Kubo-Greenwood formula to describe the average transition rate for the optical absorption process. Asymptotic analysis leads to the commonly observed exponential tail as well as the Tauc expression for the fundamental absorption. We test our theoretical results with experimental absorption coefficients of amorphous Si:H, SiC:H, AlN and SiN. The validity of the Urbach focus concept is evaluated.

Semiclassical density-of-states and optical-absorption analysis of amorphous semiconductors

1995 ◽  
Vol 51 (7) ◽  
pp. 4143-4149 ◽  
Author(s):  
Stephen K. O’Leary ◽  
Stefan Zukotynski ◽  
John M. Perz
Keyword(s):  
Optical Absorption ◽  
Density Of States ◽  
Amorphous Semiconductors ◽  
Absorption Analysis

Periodic Structure Formation During Laser Direct-Writing of Palladium Acetate Films: An Optically Regulated Mechanism

1987 ◽  
Vol 101 ◽  
Author(s):  
L. Baufay ◽  
M. E. Gross
Keyword(s):  
Optical Absorption ◽  
Periodic Structure ◽  
Reaction Rate ◽  
Amorphous Semiconductors ◽  
Palladium Acetate ◽  
Complex Relationship ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wide Range ◽  
Micron Size

ABSTRACTLaser direct-writing of micron-size metallic features from Pd acetate film precursors is achieved using a scanned cw Ar+ laser. Marked periodic structure is observed in these features under a wide range of exposure conditions. A model based on laser reflectivity and transmittance measurements has been developed to describe the formation of the periodic structure. The model takes into account a complex relationship between optical absorption, laser-induced heating and reaction rate. The decomposition of Pd acetate to metal is endothermic and, therefore, this system differs fundamentally from the “explosive” crystallisation of amorphous semiconductors.

Theoretical studies of optical absorption in amorphous semiconductors

1987 ◽  
Vol 20 (1) ◽  
pp. 121-143 ◽  
Author(s):  
U Dersch ◽  
M Grunewald ◽  
H Overhof ◽  
P Thomas
Keyword(s):  
Optical Absorption ◽  
Amorphous Semiconductors ◽  
Theoretical Studies
Sign in / Sign up

Export Citation Format

Share Document