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A p-n junction (or a metal-semiconductor junction) with rectifying behaviour is an electronic device which allows a one-way only current flow (between the two semiconductor regions, or between the metal and the semiconductor). An ohmic contact in a metal-semiconductor junction is realized by lowering the potential barrier (allowing electrons to easily migrate into the metal) and by increasing the doping levels in the semiconductor (more than 10^18 cm^-3): this way the potential barrier, that should stop electrons from migrating into the semiconductor, is confined in a very small region making it possible for electrons with low energy to pass through it (tunneling effect). This means that in a ohmic contact current can flow both ways; such a device apparently works like a resistor with a low resistance, hence the "ohmic contact" name.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoideal metal semiconductor contacts are ohmic when the charge introduced in semiconductor is aligning the fermi levels is provided by majority carriers.
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Is diode ohmic or non-ohmic conductor?
Diode is a non-ohmic conductor since in diodes current-voltage relation ship does't obey Ohm's law....the relationship between current and voltage is nonlinear here,...
Why are ohmic materials useful?
because ohmic materials such as resistors can be placed in ur bedroom for safe sex
Are fixed resistors ohmic?
yes
What are non ohmic devices give an example?
non ohmic devices are diodes, LED's, Thermistors, LDR(light dependent resistors, cells in series.
What is the shape of graph of voltage versus current for an ohmic material?
Linear.
What is the difference between an ohmic resistor and a non-ohmic resistor?
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.
What is the difference between resistor and metrosil?
Resistors are ohmic and fixed whereas metrosils are non ohmic and variable - version of a varistor.
What is the difference between ohmic and non ohmic elements?
An 'ohmic' resistor is one which obeys Ohm's Law. For Ohm's Law to apply, the resistance of a circuit must be constant over the range of incremental voltages applied to it. If the resistance changes over an incremental range of voltages, then it is said to be 'non-ohmic', and it does not obey Ohm's Law.
Differentiate between ohmic and non ohmic substances?
which law follow non ohmic substances
Is Thermistor ohmic or non-ohmic?
no.....thermistors are not ohmic.
Is diode ohmic or non-ohmic conductor?
Diode is a non-ohmic conductor since in diodes current-voltage relation ship does't obey Ohm's law....the relationship between current and voltage is nonlinear here,...
Is vacuum tube ohmic or non-ohmic and why?
Vacuum tubes are non-ohmic devices
What is the definition of an ohmic conductor?
An ohmic resistor is a resistor that obeys Ohm's law, and a non-ohmic one dose not. All resistors resistance will begin to change as there temperature changes, and often we need a resistor with a steady resistance, thus some resistors, which we refer to as ohmic, will disperse the heat being generated and therefore it will keep a steady resistance. Resistors that do not disperse their heat will have varying resistances and therefore are non ohmic. Ohms law, named after the German physicist Georg Ohm, states that the current through a conductor, between two points, is directly proportional to the potential difference (voltage) across the two points, and inversely proportional to the resistance between them. ~Ben Frilay-Cox
What are ohmic and non - ohmic conductors?
ohmic conductor does obey ohm 's law. non ohmic conductor does not obey ohm's law.
Why the resistant in ohmic devices is constant and in non ohmic not constant?
the resistant in ohmic devices is constant because it depend on temperature ..and temperature is constant independent of polarity of potential difference...btin non ohmic the tempt increase with voltage which increase due to the heat increase beacue of power dispition....collision of electrons increases find more resistenc for passing so resistence increases
What are the quantities involved in Ohm's law?
-- Voltage between two points-- Resistance of the conducting path between the same two points-- Current that flows between the two pointsAnswerThere are two quantities involved with Ohm's Law: potential difference and current. For a circuit to obey Ohm's Law, the ratio of potential difference must be constant. Not many circuits obey Ohm's Law. Those that do, are called 'linear' or 'ohmic' circuits; those that don't are termed 'non-linear' or 'non-ohmic'.
Example of non -ohmic and ohmic materials?
iron,gold
