0
Some examples of indirect bandgap materials include silicon, germanium, and gallium arsenide. These materials have a bandgap structure in which electrons have different momentum in the conduction band compared to the valence band, making optical transitions less likely.
Add your answer:
Earn +20 pts
Is germanium sulfide direct bandgap material or indirect?
Germanium sulfide is known as an indirect bandgap material, as the minimum energy required for an electron transition between the valence and conduction bands occurs at different momentum points in the Brillouin zone.
What is the bandgap of germanium?
The bandgap of germanium is approximately 0.67 electronvolts (eV) at room temperature. This means that germanium is a semiconductor material with properties that are intermediate between conductors and insulators.
Why germanium is not used as LED material?
Germanium is not commonly used as an LED material because it has an indirect bandgap, making it less efficient for light emission. Materials with direct bandgaps, like gallium nitride and gallium arsenide, are better suited for LED applications as they allow for more efficient conversion of electrical energy into light.
Difference between direct material and indirect material?
Direct materials are raw materials that are directly used in the production process and can be easily traced to a specific product. Indirect materials are not directly used in production but are necessary for the business to operate, such as cleaning supplies or maintenance tools.
What property do you use to classify materials into three states?
The property used to classify materials into three states (solid, liquid, gas) is their intermolecular forces. Solids have strong forces holding particles together in a fixed arrangement, liquids have weaker forces allowing for particles to move past each other, and gases have very weak forces allowing for particles to move freely.
Why we can't use silicon and germanium in laser diode?
Silicon and germanium are indirect bandgap materials, which means they are not efficient in emitting light when an electric current passes through them. Laser diodes require direct bandgap materials such as gallium arsenide or indium phosphide, which are more efficient in converting electrical energy into light.
Is germanium sulfide direct bandgap material or indirect?
Germanium sulfide is known as an indirect bandgap material, as the minimum energy required for an electron transition between the valence and conduction bands occurs at different momentum points in the Brillouin zone.
Why si and ge does not emit light?
Silicon (Si) and Germanium (Ge) do not emit light because they are indirect bandgap materials. This means that when they are excited, most of the electrons and holes recombine through phonon-mediated transitions, resulting in the release of heat instead of light. In contrast, direct bandgap materials, such as gallium arsenide (GaAs), release light when electrons and holes recombine.
Are indirect labor and materials part of Factory Overhead?
Would overhead include indirect materials and indirect labor?
Are indirect materials variable or fixed cost?
Indirect
What is the difference of indirect materials and direct materials?
One is indirect and one is direct!
What is type 1 and type 2 semiconductors?
Type 1 Semiconductors: The bandgap of one semiconductor is completely contained in the bandgap of the other one. In double heterostructure design carriers will be confined in the smaller bandgap material. this structure is used to form barrier/quantum well in Multi quantum well lasers and LEds Type II: like Type I The bandgap of the two materials overlap but the changes in the conduction and valence bands change sign. this type of materials do not use for light emiiting application as carriers can not be confined.
Can Raw materials be direct or indirect?
raw material are indirect material
Why efficiency of solar photovoltaic cell is not 100 percent?
Because semiconductors such as silicon are indirect bandgap semiconductors, so some of the light energy is wasted as lattice vibrations (phonons).
Prime cost and conversion cost?
Prime cost = direct materials + direct laborwhile conversion cost = direct labor + factory overhead( which includes indirect materials, indirect labor and other indirect costs
Is indirect materials factory a fixed or variable cost?
no
What is difference between direct purchase and indirect purchase?
The difference between direct purchase and indirect purchase is in what is purchased. Relating to raw materials, direct purchase is materials that go directly on a product and indirect is materials used to produce the product. Direct purchase can refer to purchasing products directly from manufacturers and indirect is purchasing through a middle person.
