Non-Equilibrium Carrier Dynamics in a-Si:H/a-SiC:H Multilayers

1992 ◽  
Vol 258 ◽  
Author(s):  
M. Petrauskas ◽  
J. Kolenda ◽  
A. Galeckas ◽  
R. Schwarz ◽  
F. Wang ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Quantum Well ◽  
Layer Thickness ◽  
Carrier Dynamics ◽  
Interface Roughness ◽  
Scattering Process ◽  
Transient Grating ◽  
Lateral Mobility ◽  
Quantum Well Structures ◽  
Free Carriers

ABSTRACTFor a series of a-Si:H/a-SiC:H quantum well structures and superlattices the diffusion coefficient for the lateral ambipolar motion of optically excited free carriers was measured using the transient grating technique. A significant dependence of the diffusion coefficient on the well layer thickness was found. With decreasing quantum well thickness the lateral mobility decreases. These observations may be explained assuming that scattering due to interface roughness is the dominant scattering process.

Transient grating studies of excitonic optical nonlinearities in GaAs/AlGaAs multiple-quantum-well structures

1989 ◽  
Vol 6 (4) ◽  
pp. 567 ◽  
Author(s):  
A. Miller ◽  
K. Woodbridge ◽  
R. J. Manning ◽  
P. K. Milsom ◽  
D. C. Hutchings ◽  
...  
Keyword(s):  
Quantum Well ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
Optical Nonlinearities ◽  
Transient Grating ◽  
Quantum Well Structures

Characterization and Griwth of Oicanic Multiple Qanm Well Structures

1990 ◽  
Vol 198 ◽  
Author(s):  
F.F. So ◽  
S.R. Forrest ◽  
Y.Q. Shi ◽  
W.H. Steier
Keyword(s):  
Quantum Well ◽  
Layer Thickness ◽  
Organic Semiconductors ◽  
Multiple Quantum Well ◽  
Energy Shift ◽  
Blue Shift ◽  
Multiple Quantum ◽  
Quantum Well Structures ◽  
Singlet Exciton ◽  
Molecular Beam Deposition

ABSTRACTMultiple quantum well structures consisting of alternating layers of two crystalline organic semiconductors, namely, 3,4,9,10 perylenetetracarboxylic dianhydride (PTCDA) and 3,4,7,8 naphthalenetetracarboxylic dianhydride (NTCDA), have been grown by organic molecular beam deposition. The layer thickness was varied from 10 to 200 Å. Birefringence measurements indicate that there is a strong structural ordering in all PrCDA layers, although the PrCDA and NTCDA crystal structures are incommensurate. From optical absorption measurements, it is found there is a blue shift in the lowest energy PICDA singlet exciton line with decreasing layer thickness. A model based on exciton quantum confinement is proposed to explain the energy shift. We have measured the low temperature photoluminescence spectra of organic quantum well structures, and found a slight red shift in the spectra with decreasing well width. These results are also discussed.

Sign in / Sign up

Export Citation Format

Share Document