A band-to-band tunneling injection mechanism for charge carriers in composite wide bandgap field emission sources

2002 ◽  
Author(s):  
P.H. Cutler ◽  
N.M. Miskovsky ◽  
P.B. Lerner ◽  
M.S. Chung
Keyword(s):  
Field Emission ◽  
Wide Bandgap ◽  
Charge Carriers ◽  
Emission Sources ◽  
Band To Band Tunneling ◽  
Injection Mechanism ◽  
Tunneling Injection

Band-to-Band Tunneling Injection Insulated-Gate Bipolar Transistor with a Soft Reverse-Recovery Built-In Diode

2012 ◽  
Vol 33 (12) ◽  
pp. 1684-1686 ◽  
Author(s):  
Huaping Jiang ◽  
Jin Wei ◽  
Bo Zhang ◽  
Wanjun Chen ◽  
Ming Qiao ◽  
...  
Keyword(s):  
Bipolar Transistor ◽  
Insulated Gate Bipolar Transistor ◽  
Band To Band Tunneling ◽  
Tunneling Injection

Theory of injection photovoltages in organic insulators

1976 ◽  
Vol 29 (10) ◽  
pp. 2123 ◽  
Author(s):  
JS Bonham
Keyword(s):  
Light Intensity ◽  
Surface States ◽  
Threshold Value ◽  
High Light Intensity ◽  
Open Circuit ◽  
Charge Carriers ◽  
Single Carrier ◽  
Injection Mechanism ◽  
Wavelength Variation ◽  
Open Circuit Photovoltage

Development of an open-circuit photovoltage, U, in an organic insulator by photoinjection of charge carriers from the electrodes is treated theoretically. In the single-carrier case (both electrodes injecting the same carrier) it is shown that, in the absence of surface traps, U increases at a rate of 60 mV per decade of light intensity, II, above a threshold value of II. Photoinjection from the back (unilluminated) electrode by incompletely absorbed light causes U to become independent of ll at high light intensity. The same process may also cause U to change sign as the wavelength approaches an absorption minimum of the organic. Traps in the bulk of the insulator do not affect the single-carrier photovoltage, but traps at the surface may complicate the intensity dependence of U if they are involved in the injection mechanism. They may for example cause U to decrease and change sign at high n. Only shallow surface traps are considered. Possible effects of surface states are discussed briefly. The major assumption of this paper--neglect of all but injected charge carriers-breaks down in principle in the two-carrier case. However, if there are no sources of photovaltage in the bulk of the insulator the two-carrier case gives a stronger dependence of U on II, and no saturation or possibility of change of sign with wavelength variation. Predictions of the model are shown to agree with the results for a number of systems reported in the literature.

scholarly journals Photonic Crystals for Plasmonic Photocatalysis

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 827 ◽  
Author(s):  
Tharishinny Raja-Mogan ◽  
Bunsho Ohtani ◽  
Ewa Kowalska
Keyword(s):  
Photocatalytic Activity ◽  
Photonic Crystals ◽  
Localized Surface Plasmon Resonance ◽  
Wide Bandgap ◽  
Charge Carriers ◽  
Localized Surface Plasmon ◽  
Synthesis Methods ◽  
Inverse Opal ◽  
Red Edge ◽  
Bandgap Semiconductors

Noble metal (NM)-modified wide-bandgap semiconductors with activity under visible light (Vis) irradiation, due to localized surface plasmon resonance (LSPR), known as plasmonic photocatalysts, have been intensively studied over the last few years. Despite the novelty of the topic, a large number of reports have already been published, discussing the optimal properties, synthesis methods and mechanism clarification. It has been proposed that both efficient light harvesting and charge carriers’ migration are detrimental for high and stable activity under Vis irradiation. Accordingly, photonic crystals (PCs) with photonic bandgap (PBG) and slow photon effects seem to be highly attractive for efficient use of incident photons. Therefore, the study on PCs-based plasmonic photocatalysts has been conducted, mainly on titania inverse opal (IO) modified with nanoparticles (NPs) of NM. Although, the research is quite new and only several reports have been published, it might be concluded that the matching between LSPR and PBG (especially at red edge) by tuning of NMNPs size and IO-void diameter, respectively, is the most crucial for the photocatalytic activity.

Field emission sources for large area displays

1979 ◽  
Vol 4 (3) ◽  
pp. 372-373 ◽  
Author(s):  
Jules D. Levine
Keyword(s):  
Field Emission ◽  
Emission Sources ◽  
Large Area

Prototypes using metal, carbon fiber and composite field emission sources modulated by a laser beam

2001 ◽  
Vol 89 (1-3) ◽  
pp. 129-135 ◽  
Author(s):  
M.S. Mousa ◽  
M. Brugat ◽  
E.P. Sheshin ◽  
M.J. Hagmann
Keyword(s):  
Carbon Fiber ◽  
Laser Beam ◽  
Field Emission ◽  
Emission Sources ◽  
Composite Field
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