DETERMINATION OF THE AMBIPOLAR DIFFUSION LENGTH BY THE STEADY STATE PHOTOCARRIER GRATING TECHNIQUE

1989 ◽  
pp. 871-883 ◽  
Author(s):  
K. Weiser ◽  
D. Ritter
Keyword(s):  
Steady State ◽  
Diffusion Length ◽  
Ambipolar Diffusion

A General Analysis of Steady State Photocarrier Grating Technique for the Determination of Ambipolar Diffusion Length

1990 ◽  
Vol 192 ◽  
Author(s):  
Yuan-Min Li
Keyword(s):  
Steady State ◽  
Electric Field ◽  
Dielectric Relaxation ◽  
General Formula ◽  
Applied Electric Field ◽  
Diffusion Length ◽  
Ambipolar Diffusion ◽  
General Analysis

ABSTRACTA general photoconductivity formula is derived for the case of a semiconductor steady state photocarrier grating (SSPG)1. It is shown that, under the condition of weak applied electric field, the ambipolar diffusion length can be determined by the SSPG technique1without the lifetime-regime restriction2,3 if the lifetime of photocarriers is known. The general formula presented here is reduced to the simple lifetime-regime formula1–3 under the condition of fast dielectric relaxation.

A-Si:H Ambipolar Diffusion Length and Effective Lifetime Measured by Flying Spot Technique (FST)

1991 ◽  
Vol 219 ◽  
Author(s):  
M. Vieira ◽  
R. Martins ◽  
E. Fortunato ◽  
F. Soares ◽  
L. Guimaraes
Keyword(s):  
Laser Beam ◽  
Transient Analysis ◽  
Diffusion Length ◽  
Transport Equations ◽  
Ambipolar Diffusion ◽  
Schottky Barriers ◽  
Effective Lifetime ◽  
Asymmetrical Distribution ◽  
Flying Spot

ABSTRACTThe determination of the ambipolar diffusion length, L*, and the effective lifetime, τ*, in p/i and a-Si:H Schottky barriers (ITO/p/a-Si:H/Al-Si; Cr/a-Si:H/Cr/Ag) have been determined by Flying Spot Technique, FST. This technique consists in the transient analysis of the photocurrent/photopotential induced by a laser beam that moves perpendicularly to the structure with a constant motion ratio, at different velocities. Taking into account the competition between the diffusion/drift velocities of the excess carriers and the velocity of the flying spot, it is possible to solve the transport equations and to compute separately L* and τ*, from the asymmetrical distribution responses.

scholarly journals Direct determination of the ambipolar diffusion length in GaAs/AlGaAs heterostructures by cathodoluminescence

1989 ◽  
Vol 55 (16) ◽  
pp. 1647-1649 ◽  
Author(s):  
H. A. Zarem ◽  
P. C. Sercel ◽  
J. A. Lebens ◽  
L. E. Eng ◽  
A. Yariv ◽  
...  
Keyword(s):  
Diffusion Length ◽  
Direct Determination ◽  
Ambipolar Diffusion

scholarly journals Direct determination of the ambipolar diffusion length in strained InxGa1−xAs/InP quantum wells by cathodoluminescence

1993 ◽  
Vol 62 (19) ◽  
pp. 2411-2412 ◽  
Author(s):  
Robert B. Lee ◽  
Kerry J. Vahala ◽  
Chung‐En Zah ◽  
Rajaram Bhat
Keyword(s):  
Quantum Wells ◽  
Diffusion Length ◽  
Direct Determination ◽  
Ambipolar Diffusion

Ambipolar diffusion length in a-Si:H(F) and a-Si,Ge:H,F measured with the steady-state photocarrier grating technique

2002 ◽  
Author(s):  
J.Z. Liu ◽  
X. Li ◽  
P. Roca i Cabarrocas ◽  
J.P. Conde ◽  
A. Maruyama ◽  
...  
Keyword(s):  
Steady State ◽  
Diffusion Length ◽  
Ambipolar Diffusion

STEADY-STATE DETERMINATION OF FUEL-BOND NITROGEN IN DIESEL AND INDUSTRIAL GAS OIL

Clean Air ◽  
2007 ◽  
Vol 8 (4) ◽  
pp. 359-371
Author(s):  
A. Medeiros ◽  
R. Edenhofer ◽  
K. Lucka ◽  
H. Kohne
Keyword(s):  
Steady State ◽  
Gas Oil ◽  
State Determination

Calcium Budgets for Catchments as Interpreted by Strontium Isotopes

1989 ◽  
Vol 20 (2) ◽  
pp. 85-96 ◽  
Author(s):  
Gunnar Jacks ◽  
Göran Åberg ◽  
P. Joseph Hamilton
Keyword(s):  
Steady State ◽  
Forest Ecosystem ◽  
Coniferous Forest ◽  
Strontium Isotopes ◽  
Runoff Water ◽  
Weathering Rate ◽  
Weathering Rates ◽  
Exchangeable Calcium

Strontium isotopes in precipitation, soil and runoff water can be used to establish a ratio of wet plus dry deposited Sr to Sr released by weathering. This ratio is especially enhanced in areas with old acid Proterozoic rocks (0.6-2.5 Ga) and Archean rocks (>2.5 Ga). Since Sr and Ca behave in an analogous way in the coniferous forest ecosystem the results for Sr can be used for the determination of Ca. If the deposition of calcium can be calculated reasonably accurately the weathering rate can also be estimated. Five catchments have been investigated using this approach. Three of them seem to be close to a steady state, wherein the losses and gains of calcium to the system are equal. In the two southern-most catchments there seems to be an ongoing loss of exchangeable calcium. The loss by runoff occurs with sulphate being the dominant anion. Weathering rates of 1.5 to 4.8 kg Ca/ha year have been estimated.

A Graphical Method for Storage Coefficient Determination from Quasi-Steady State Flow Data

1996 ◽  
Vol 27 (4) ◽  
pp. 247-254 ◽  
Author(s):  
Zekâi Şen
Keyword(s):  
Steady State ◽  
Graphical Method ◽  
Pumping Test ◽  
Quasi Steady State ◽  
Flow Data ◽  
Steady State Flow ◽  
Storage Coefficient ◽  
State Flow ◽  
Aquifer Test

A simple, approximate but practical graphical method is proposed for estimating the storage coefficient independently from the transmissivity value, provided that quasi-steady state flow data are available from a pumping test. In the past, quasi-steady state flow distance-drawdown data have been used for the determination of transmissivity only. The method is applicable to confined and leaky aquifers. The application of the method has been performed for various aquifer test data available in the groundwater literature. The results are within the practical limits of approximation compared with the unsteady state flow solutions.

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