GaAsSb bandgap, surface fermi level, and surface state density studied by photoreflectance modulation spectroscopy

2012 ◽  
Vol 100 (22) ◽  
pp. 222104 ◽  
Author(s):  
J. S. Hwang ◽  
J. T. Tsai ◽  
I. C. Su ◽  
H. C. Lin ◽  
Y. T. Lu ◽  
...  
Keyword(s):  
Fermi Level ◽  
Surface State ◽  
State Density ◽  
Modulation Spectroscopy ◽  
Surface State Density ◽  
Surface Fermi Level

Strong surface Fermi level pinning and surface state density in GaAs0.65Sb0.35 surface intrinsic-n+ structure

2009 ◽  
Vol 95 (14) ◽  
pp. 141914 ◽  
Author(s):  
K. I. Lin ◽  
H. C. Lin ◽  
J. T. Tsai ◽  
C. S. Cheng ◽  
Y. T. Lu ◽  
...  
Keyword(s):  
Fermi Level ◽  
Surface State ◽  
State Density ◽  
Surface State Density ◽  
Fermi Level Pinning ◽  
Strong Surface ◽  
Surface Fermi Level

Studies of Surface State Densities of Semiconductors by Room-Temperature Photoreflectance

1999 ◽  
Vol 573 ◽  
Author(s):  
J. S. Hwan ◽  
G. S. Chang
Keyword(s):  
Fermi Level ◽  
Barrier Height ◽  
Surface State ◽  
Transport Theory ◽  
Thermionic Emission ◽  
State Density ◽  
Surface Barrier ◽  
Novel Approach ◽  
State Densities ◽  
Surface Fermi Level

ABSTRACTIn this study, we develop a novel approach to determine the surface Fermi level and the surface state densities of semiconductors. The built-in electric field and thus the surface barrier height are evaluated from the Franz-Keldysh oscillations in the PR spectra. Based on the thermionic-emission theory and current-transport theory, the surface state density as well as the pinning position of the surface Fermi level can be determined from the dependence of the surface barrier height on the pump beam intensity. Even though this method is significantly simpler, easier to perform, and time efficient compared with other approaches, the results obtained agree with the literature.

scholarly journals Fermi-level pinning in methylammonium lead iodide perovskites

Nanoscale ◽  
2019 ◽  
Vol 11 (36) ◽  
pp. 16828-16836 ◽  
Author(s):  
Thibaut Gallet ◽  
David Grabowski ◽  
Thomas Kirchartz ◽  
Alex Redinger
Keyword(s):  
Fermi Level ◽  
Surface State ◽  
State Density ◽  
Scanning Tunnelling Microscopy ◽  
Lead Iodide ◽  
Surface State Density ◽  
Fermi Level Pinning ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy ◽  
Methylammonium Lead Iodide

Scanning tunnelling microscopy measurements reveal grain dependent changes in surface state density and workfunctions on polycrystalline CH3NH3PbI3 absorbers.

Surface state density decrease in nanostructured polycrystalline SnO2: modelling and experimental evidence

2004 ◽  
Vol 100 (1-2) ◽  
pp. 283-286 ◽  
Author(s):  
C. Malagù ◽  
M.C. Carotta ◽  
H. Fissan ◽  
V. Guidi ◽  
M.K. Kennedy ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Surface State ◽  
State Density ◽  
Surface State Density ◽  
Density Decrease

Correlation between Photoluminescence and Surface-State Density on GaAs Surfaces Subjected to Various Surface Treatments

1988 ◽  
Vol 27 (Part 2, No. 11) ◽  
pp. L2177-L2179 ◽  
Author(s):  
Hideki Hasegawa ◽  
Toshiya Saitoh ◽  
Seiichi Konishi ◽  
Hirotatsu Ishii ◽  
Hideo Ohno
Keyword(s):  
Surface State ◽  
State Density ◽  
Surface Treatments ◽  
Surface State Density
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