Quick Answer: Why Is Germanium A Semiconductor?

Is Diamond a semiconductor?

Diamond is a wide-bandgap semiconductor (Egap = 5.47 eV) with tremendous potential as an electronic device material in both active devices, such as high-frequency field-effect transistors (FETs) and high-power switches, and passive devices, such as Schottky diodes..

Is germanium a semiconductor?

It is a lustrous, hard-brittle, grayish-white metalloid in the carbon group, chemically similar to its group neighbours silicon and tin. Pure germanium is a semiconductor with an appearance similar to elemental silicon.

Why silicon is better semiconductor than germanium?

At room temperature, Silicon crystal has fewer free electrons than Germanium crystal. This implies that silicon will have much smaller Collector cut off current than Germanium. … The structure of Germanium crystals will be destroyed at higher temperature. However, Silicon crystals are not easily damaged by excess heat.

What are 3 uses for germanium?

The largest use of germanium is in the semiconductor industry. When doped with small amounts of arsenic, gallium, indium, antimony or phosphorus, germanium is used to make transistors for use in electronic devices. Germanium is also used to create alloys and as a phosphor in fluorescent lamps.

Is germanium man made or natural?

Germanium is not found as the free element in nature. Germanium is found in germanite, argyrodite, and some zinc ores. It is also present in coal and its presence in coal insures reserves for many years.

Does germanium react with water?

Reaction of germanium with water The surface of lumps of germanium is protected by a very thin layer of germanium dioxide, GeO2. … This oxide layer renders germanium more or less inert to water.

Why is silicon so important?

Plants use silicon to strengthen their cell walls. The element appears to be an important nutrient that helps confer resistance to disease, according to a 1994 paper in the journal Proceedings of the National Academy of Sciences. Silicon Valley gets its name from the silicon used in computer chips.

Is Si a semiconductor?

The material most frequently used in semiconductors is Silicon (chemical symbol = Si). … Each Silicon atom is combined with four neighboring silicon atoms by four bonds. Silicon, a very common element, is used as the raw material of semiconductors because of its stable structure.

What is the use of germanium?

This is now the major use for this element. Germanium is also used as an alloying agent (adding 1% germanium to silver stops it from tarnishing), in fluorescent lamps and as a catalyst. Both germanium and germanium oxide are transparent to infrared radiation and so are used in infrared spectroscopes.

Why is germanium named after Germany?

The name “germanium” comes from the Latin name for Germany, named for Winkler’s home country, according to the Jefferson Lab. According to Chemicool, the abundance of germanium in the Earth’s crust is about 1.5 parts per million by weight, and the abundance in the solar system is about 200 parts per billion by weight.

What is arsenic used for?

Arsenic is used as a doping agent in semiconductors (gallium arsenide) for solid-state devices. It is also used in bronzing, pyrotechnics and for hardening shot. Arsenic compounds can be used to make special glass and preserve wood.

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.

Why silicon is a semiconductor?

Silicon. A silicon atom has 14 electrons around the nucleus, and of these, there are 4 valence electrons on the outermost orbital. When this is made into a single crystal, it can be used as a material for semiconductor products.

Is germanium harmful to humans?

Germanium is LIKELY UNSAFE when taken by mouth in elemental form and in the form of certain compounds such as germanium oxide. There have been more than 30 reports of kidney failure and death linked with use of these forms of germanium. It builds up in the body and can damage vital organs such as the kidneys.

What color is arsenic?

Arsenic is a silver-gray or white metallic solid element found in nature. Arsenic combines with other elements to form organic and inorganic compounds.

Why germanium is not used in solar cells?

Germanium is never used by itself as a solar cell because the efficiency is much lower than silicon, a cheaper alternative. … The room temperature band gaps of germanium, silicon and gallium arsenide are superimposed. Both Si and GaAs make good single junction cells but silicon is far cheaper than GaAs.

Is germanium a rare earth element?

Rare earth elements are also expected to play a big part in the future. … Cerium, the most common, is similar in abundance to copper and more abundant than lead, tin, cadmium, boron, tantalum, germanium and numerous other commonly used elements. Even so, rare earth elements are in short supply.

Why germanium is not used in 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.