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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?
LEDs are made from binary semiconductors (e.g. gallium aluminum indium phosphide) not unary semiconductors (e.g. silicon, germanium) because they can be made transparent to light. Silicon & germanium are opaque.
Difference between direct material and indirect material?
Direct material are those material which are easily identified, conveniently measured and directly charged to the cost of production. It is also part of the finished product. Example of direct materials are Timber in cases of furniture making, Leather in case of shoe making, cotton in case of shirt making etc. Indirect Material are those materials which cannot be conveniently identified & allocated to the cost centre or cost unit. It does also not form part of the finished product. Example of indirect material are bottom in case of shirt making, Thread in case of shirt making, pin & paste in case of furniture making etc.
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.
