Analysis of the Bias Dependent Spectral Response of a-SiC:H p-i-n Photodiode

2002 ◽  
Vol 715 ◽  
Author(s):  
P. Louro ◽  
A. Fantoni ◽  
Yu. Vygranenko ◽  
M. Fernandes ◽  
M. Vieira
Keyword(s):  
Bias Voltage ◽  
Voltage Dependence ◽  
Spectral Response ◽  
Surface Recombination ◽  
Electrical Field ◽  
Field Reversal ◽  
Current Voltage ◽  
Voltage Dependent ◽  
And Inversion ◽  
Device Operation

AbstractThe bias voltage dependent spectral response (with and without steady state bias light) and the current voltage dependence has been simulated and compared to experimentally obtained values. Results show that in the heterostructures the bias voltage influences differently the field and the diffusion part of the photocurrent. The interchange between primary and secondary photocurrent (i. e. between generator and load device operation) is explained by the interaction of the field and the diffusion components of the photocurrent. A field reversal that depends on the light bias conditions (wavelength and intensity) explains the photocurrent reversal. The field reversal leads to the collapse of the diode regime (primary photocurrent) launches surface recombination at the p-i and i-n interfaces which is responsible for a double-injection regime (secondary photocurrent). Considerations about conduction band offsets, electrical field profiles and inversion layers will be taken into account to explain the optical and voltage bias dependence of the spectral response.

scholarly journals Characterization of receptors mediating the actions of dopamine on an identified inhibitory motoneurone of the cockroach

1991 ◽  
Vol 155 (1) ◽  
pp. 203-217 ◽  
Author(s):  
J. P. Davis ◽  
R. M. Pitman
Keyword(s):  
Periplaneta Americana ◽  
Voltage Dependence ◽  
Negative Resistance ◽  
Membrane Potentials ◽  
Dopaminergic Agonists ◽  
Current Voltage ◽  
Voltage Dependent ◽  
Inward Currents ◽  
Ly 171555 ◽  
Relationship Of

1. The effects of a number of dopaminergic agonists and antagonists upon the soma of a prothoracic inhibitory motoneurone of the cockroach (Periplaneta americana) have been recorded under voltage-clamp conditions. 2. Dopamine generates inward currents that are extremely voltage-dependent: currents increase rapidly at membrane potentials more negative than about −120 to −150 mV and also show a peak at membrane potentials of approximately −20 mV. As a result of this voltage-dependence, dopamine induces a region of negative resistance in the current-voltage relationship of the neurone. 3. The dopaminergic agonists apomorphine, bromocriptine, ergometrine and A-6,7-DTN mimic the action of dopamine on this neurone, all having a similar voltage-dependence to that of dopamine. The selective D-1 receptor agonist SK&F82526 and the D-2 agonist LY 171555, however, were both inactive on the preparation. 4. Responses to dopamine were suppressed by a number of D-1 and D-2 receptor antagonists, indicating that the pharmacological profile of the dopamine-sensitive receptor in this insect preparation is different from that of vertebrate dopamine receptors.

Analysis of voltage-dependent membrane currents in spatially extended neurons from point-clamp data

1993 ◽  
Vol 69 (1) ◽  
pp. 241-247 ◽  
Author(s):  
W. Muller ◽  
H. D. Lux
Keyword(s):  
Voltage Dependence ◽  
Outward Current ◽  
Resting Potential ◽  
Inward Current ◽  
Outward Currents ◽  
Current Voltage ◽  
Voltage Dependent ◽  
Spatially Extended ◽  
Model Cell ◽  
Space Constant

1. Numerical methods were used to evaluate voltage space-clamp performance in the investigation of a voltage-dependent inward current similar to the noninactivating Ca current. In addition, the cell is equipped with a repolarizing system, represented by leak and outwardly rectifying outward conductances. The electrotonically compact model cell is represented by a cable with an electrotonic length of 1 space constant under control conditions, but that becomes effectively only 0.33 space constants during a 90% reduction of the leak and outward conductance. The cable is perfectly voltage clamped at one end. 2. The apparent voltage dependence, activation, and inactivation of the clamp current depend on the distribution of the membrane slope conductance along the cable; this depends on 1) the distribution of the inward current along the cable and 2) the amplitude of the inward current relative to the amplitudes of the leak and voltage-dependent outward currents. 3. Under control conditions, the membrane voltage decays steeply with distance from the command voltage at the clamp site to almost resting potential for most of the rest of the cable. This is because the leak and outward current are dominant over the inward current. The inward current is activated primarily at the clamped part of the cable. Clamp currents are activated instantaneously. The clamp-current current-voltage (I-V) relation is less steep with depolarization because the membrane potential for locations away from the clamp site lags behind the clamp potential. 4. When the conductances for leak and outward current are reduced by 90%, these conductances lose their dominance. The membrane slope conductance now has a range with negative values.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Inactivation of monazomycin-induced voltage-dependent conductance in thin lipid membranes. II. Inactivation produced by monazomycin transport through the membrane.

1976 ◽  
Vol 67 (6) ◽  
pp. 731-748 ◽  
Author(s):  
R J Heyer ◽  
R U Muller ◽  
A Finkelstein
Keyword(s):  
Sodium Channels ◽  
Lipid Membranes ◽  
Voltage Dependence ◽  
The Other ◽  
Induced Voltage ◽  
Electrical Field ◽  
Oh Groups ◽  
Solution Interface ◽  
First Approximation ◽  
Voltage Dependent

At sufficiently large conductances, the voltage-dependent conductance induced in thin lipid membranes by monazomycin undergoes inactivation. This is a consequence of depletion of monazomycin from the membrane solution interface, as monazomycin crosses the membrane to the opposite (trans) side from which it was added. The flux of monazomycin is directly proportional to the monazomycin-induced conductance; at a given conductance it is independent of monazomycin concentration. We conclude that when monazomycin channels break up, some or all of the molecules making up a channel are deposited on the trans side. We present a model for the monazomycin channel: approximately five molecules, each spanning the membrane with its NH3+ on the trans side and an uncharged hydrophilic (probably sugar) group anchored to the cis side, form an aqueous channel lined by--OH groups. The voltage dependence arises from the flipping by the electrical field of molecules lying parallel to the cis surface into the "spanned state;" the subsequent aggregation of these molecules into channels is, to a first approximation, voltage independent. The channel breakup that deposits monomers on the trans side involves the collapsing of the channel in such a way that the uncharged hydrophilic groups remain in contact with the water in the channel as they close the channel from behind. We also discuss the possibility that inactivation of sodium channels in nerve involves the movement from one side of the membrane to the other of the molecules (or molecule) forming the channel.

Conductance and Capacitance Responses of Metal-Organic-Metal Structure Based Organic Semiconductor Thin Film

2017 ◽  
Vol 268 ◽  
pp. 264-268
Author(s):  
Hoh Hang Tak ◽  
Khairul Anuar Mohamad ◽  
Bablu Kumar Ghosh ◽  
Afishah Alias ◽  
Ismail Saad
Keyword(s):  
Thin Film ◽  
Bias Voltage ◽  
Voltage Dependence ◽  
Series Resistance ◽  
Low Frequency ◽  
Metal Structure ◽  
High Frequencies ◽  
Voltage Dependent ◽  
Metal Organic ◽  
Lcr Meter

In this work we have investigated the frequency and the bias voltage dependence of the electrical responses of organic structures based on poly (triarylamine) (PTAA) thin film using ITO/Organic/Al diode structure. The frequency-dependent and bias voltage-dependent conductance and capacitance were investigated using a precision LCR meter with wide frequency test (10 Hz – 100 kHz) and various bias voltages ranges (0.2 to 5.0 V), respectively. Investigation revealed that conductance was strongly dependent on the frequency and bias voltage-dependent. Conductance was inversely proportional to the capacitance among the frequency. Meanwhile, the capacitance and series resistance were dependent until a certain value at the low frequency region, but the capacitance and series resistance were independent at high frequencies.

Dependence of Na+-K+ pump current-voltage relationship on intracellular Na+, K+, and Cs+ in rabbit cardiac myocytes

2002 ◽  
Vol 283 (5) ◽  
pp. C1511-C1521 ◽  
Author(s):  
Peter S. Hansen ◽  
Kerrie A. Buhagiar ◽  
Benjamin Y. Kong ◽  
Ronald J. Clarke ◽  
David F. Gray ◽  
...  
Keyword(s):  
Voltage Dependence ◽  
Ventricular Myocytes ◽  
Pump Current ◽  
Inhibitory Effect ◽  
Negative Slope ◽  
Current Voltage ◽  
Patch Pipette ◽  
Voltage Dependent ◽  
Current Voltage Relationship ◽  
Voltage Relationship

To examine effects of cytosolic Na+, K+, and Cs+ on the voltage dependence of the Na+-K+ pump, we measured Na+-K+ pump current ( I p) of ventricular myocytes voltage-clamped at potentials ( V m) from −100 to +60 mV. Superfusates were designed to eliminate voltage dependence at extracellular pump sites. The cytosolic compartment of myocytes was perfused with patch pipette solutions with a Na+ concentration ([Na]pip) of 80 mM and a K+ concentration from 0 to 80 mM or with solutions containing Na+ in concentrations from 0.1 to 100 mM and K+ in a concentration of either 0 or 80 mM. When [Na]pip was 80 mM, K+ in pipette solutions had a voltage-dependent inhibitory effect on I pand induced a negative slope of the I p- V m relationship. Cs+ in pipette solutions had an effect on I p qualitatively similar to that of K+. Increases in I p with increases in [Na]pip were voltage dependent. The dielectric coefficient derived from [Na]pip- I p relationships at the different test potentials was 0.15 when pipette solutions included 80 mM K+ and 0.06 when pipette solutions were K+free.

Bias-Voltage-Dependent Subcircuit Model for Millimeter-Wave CMOS Circuit

2012 ◽  
Vol E95.C (6) ◽  
pp. 1077-1085 ◽  
Author(s):  
Kosuke KATAYAMA ◽  
Mizuki MOTOYOSHI ◽  
Kyoya TAKANO ◽  
Ryuichi FUJIMOTO ◽  
Minoru FUJISHIMA
Keyword(s):  
Millimeter Wave ◽  
Bias Voltage ◽  
Cmos Circuit ◽  
Voltage Dependent

Bias Voltage Dependence of Quasiparticle Recombination in STJ Detectors with Killed Electrode

2008 ◽  
Vol 151 (1-2) ◽  
pp. 287-291 ◽  
Author(s):  
V. A. Andrianov ◽  
L. V. Filippenko ◽  
V. P. Gorkov ◽  
V. P. Koshelets
Keyword(s):  
Bias Voltage ◽  
Voltage Dependence ◽  
Bias Voltage Dependence

Voltage dependence of conductance changes evoked by glycine release in the zebrafish brain

1995 ◽  
Vol 73 (6) ◽  
pp. 2404-2412 ◽  
Author(s):  
P. Legendre ◽  
H. Korn
Keyword(s):  
Voltage Dependence ◽  
Reversal Potential ◽  
Voltage Sensitivity ◽  
M Cell ◽  
Open Probability ◽  
Similar Time ◽  
Whole Cell ◽  
Glycine Release ◽  
Cell Recording ◽  
Voltage Dependent

1. The kinetics and mechanisms underlying the voltage dependence of inhibitory postsynaptic currents (IPSCs) recorded in the Mauthner cell (M cell) were investigated in the isolated medulla of 52-h-old zebrafish larvae, with the use of whole cell and outside-out patch-clamp recordings. 2. Spontaneous miniature IPSCs (mIPSCs) were recorded in the presence of 10(-6) M tetrodotoxin (TTX), 10 mM MgCl2, and 0.1 mM [CaCl2]o. Depolarizing the cell from -50 to +50 mV did not evoke any significant change in the distribution of mIPSC amplitudes, whereas synaptic currents were prolonged at positive voltages. The average decay time constant was increased twofold at +50 mV. 3. The voltage dependence of the kinetics of glycine-activated channels was first investigated during whole cell recording experiments. Currents evoked by voltage steps in the presence of glycine (50 microM) were compared with those obtained without glycine. The increase in chloride conductance (gCl-) evoked by glycine was time and voltage dependent. Inactivation and reactivation of the chloride current were observed during voltage pulses from 0 to -50 mV and from -50 to 0 mV, respectively, and they occurred with similar time constants (2-3 s). During glycine application, voltage-ramp analysis revealed a shift in the reversal potential (ECl-) occurring at all [Cl-]i tested. 4. The basis of the voltage sensitivity of glycine-evoked gCl- was first analyzed by measuring the relative changes in the total open probability (NPo) of glycine-activated channels with voltage.(ABSTRACT TRUNCATED AT 250 WORDS)

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