Which Diode Is Better Silicon Or Germanium?

What is the difference between silicon and germanium diodes?

A Silicon Diode is a semiconductor that has both positive and negative charge polarity and can allow an electrical current to flow in one direction whilst restricting another.

Silicon Diodes have a forward voltage of approximately 0.7 volts whereas Germanium Diodes have a forward voltage of approximately 0.3 volts..

When compared to a germanium diode a silicon diode reverse saturation current is?

The reverse saturation current Io of the diode increases ap[proximately 7 percent / 0c for both germanium and silicon. Since (1.07)10 ~ 2, reverse saturation current approximately doubles for every 10oc rise in temperature.

How does zener diode works?

A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. … The Zener diode has a well-defined reverse-breakdown voltage, at which it starts conducting current, and continues operating continuously in the reverse-bias mode without getting damaged.

How does a Schottky diode work?

A typical diode combines p-type and n-type semiconductors to form a p-n junction. In a Schottky diode metal replaces the p-type semiconductor. This metal can range from platinum to tungsten, molybdenum, gold, etc. When metal is combined with an n-type semiconductor an m-s junction is formed.

Which diode is used for rectifier?

For power rectification applications, power diodes or Schottky diodes are normally used. For signal rectification small point contact diodes, signal diodes, or Schottky diodes may be used. The Schottky diode has the advantage that it only requires a forward voltage of around 0.2 – 0.3volts for forward conduction.

What is the advantage of using silicon chips in computers?

So in short, silicon is a highly pure, easy to use, and cheap semiconductor, perfect for the now huge computer chip industry. Answer 5: Silicon is used because it can be used as either an insulator (doesn’t allow electricity to flow) or a semiconductor (allows a little flow of electricity).

Why does leakage current increase with temperature?

At room temperatures of 25°C or 78°F, there is negligible amount of minority carriers present in a reverse bias diode. When the surrounding temperature rises, it causes significant increase in minority carrier creation and as a result it causes a corresponding increase in leakage current.

Why is silicon the best semiconductor?

Silicon is used for electronic devices because it is an element with very special properties. One of it’s most important properties is that it is a semiconductor. This means that it conducts electricity under some conditions and acts as an insulator under others. … It is even the most common element in the Earth’s crust.

Why is germanium not used for SCR?

Ability to withstand at high temperature: silicon crystals have capability to withstand at higher temperature compare to germanium crystals . So if leakage current is produced in SCR it heats up the device then silicon crystals can withstand but not germanium crystals.

What is a germanium diode?

Germanium diodes are made from germanium. They used to be used a lot in early electronics, such as radios, but they have largely been replaced by silicon diodes. Even though silicon diodes are more popular today, germanium diodes still offer some advantages that silicon diodes don’t.

Why is carbon Not a semiconductor?

Carbon is not used as semiconductor it has 4 valence electrons in it valence shell but the energy gap is very small it will conduct electricity even at room temperature ,the size of carbon is very small .

What are the advantages and disadvantages of semiconductor over other devices?

Unlike vacuum tubes, semiconductors are shock-proof. Moreover, they are smaller in size and occupy less space and consume less power. Compared to vacuum tubes, semiconductors are extremely sensitive to temperature and radiation. Semiconductors are cheaper than vacuum diodes and have an unlimited shelf life.

What current flows in reverse bias?

5.1. Reverse bias usually refers to how a diode is used in a circuit. If a diode is reverse biased, the voltage at the cathode is higher than that at the anode. Therefore, no current will flow until the electric field is so high that the diode breaks down.

What are the two most used semiconductor materials?

Some examples of semiconductors are silicon, germanium, gallium arsenide, and elements near the so-called “metalloid staircase” on the periodic table. After silicon, gallium arsenide is the second most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others.

What is diode leakage current?

The leakage current of diode is the current that the diode will leak when a reverse voltage is applied to it. … For all basic purposes, leakage current is very small, and, thus, is normally negligible.

Why leakage current is more for germanium diode?

Much of the leakage current is due to surface conduction, related to the lack of cleanliness of the semiconductor surface. Both leakage currents increase with increasing temperature, approaching a µA for small silicon diodes. For germanium, the leakage current is orders of magnitude higher.

What is silicon diode?

Silicon Diodes, LED’s and Boltzmann’s Constant A diode is a widely used two-terminal circuit element that minimizes current flow in one direction (reverse bias), while easily carrying current in the other direction (forward bias). A semiconductor material that changes abruptly from p-type to n-type has this property.

What are 5 uses silicon?

Silicon is one of the most useful elements to mankind. Most is used to make alloys including aluminium-silicon and ferro-silicon (iron-silicon). These are used to make dynamo and transformer plates, engine blocks, cylinder heads and machine tools and to deoxidise steel. Silicon is also used to make silicones.