The velocity of the silicon electrons at room temperature for an electric field of 1 kV/cm is approximately 1.4 x 10 cm/s. Consider effective mass of electron is 0.26 times the rest mass and the free electron rest mass as 9.1×10³1 Kg. 1) Calculate the mobility of electrons. 2) Calculate the relaxation time (average time of particle collisions in semiconductor) of electrons. 3) Calculate the diffusion coefficient. 4) Will the mobility increase or decrease if the electric field increases? 5) Will the relaxation time increase or decrease if the electric field increases? 6) Will the diffusion coefficient increase or decrease if the electric field increases?
Analysis of Diode
It is a semiconductor device in electronics applications where only a one-way current is required. It is like a one-way switch that allows current to flow in one direction only. A diode has two terminals, a cathode, and an anode. The cathode is the negative terminal that carries electrons, while the anode is the positive terminal that carries holes. Although no element has holes, it just means that there is a free space for electrons. Diodes are used to convert AC to DC. As we know, AC shifts between positive and negative cycles and DC stays positive constantly. As the diodes allow current only in one direction, they filter out the AC signal’s negative cycle and only keep the positive one.
Working and Construction
In civil engineering, construction means the application of principles of science and mathematics for building bridges, dams, buildings, roads, highways, tunnels, airports, structures, etc. Different branches of science, like physics and chemistry, are extensively applied to design and analysis in construction. Material properties, the science of atmospheric conditions (like solutions, mixtures, etc.), the impact of environmental factors like, corrosion and acidity are some of the primary knowledge of chemistry which are used by civil engineers to carry out construction. Estimation of forces, application of laws of mechanics, fluids mechanics, soil mechanics, etc. are some of the fundamental concepts of physics, which are well applied in construction works. Building construction and structural engineering are two of the most primary areas in civil engineering that parallelly applies principles of both chemistry and physics to carry on construction works.
Property of Diode
An electronic component that facilitates the directional flow of current is known as a diode. According to the direction of the flow of current, the resistance of a diode changes from zero to Infinity.
The formal definition of mobility is the value of the drift velocity per unit of electric field strength, hence the greater the particle's mobility, the quicker it travels at a given electric field intensity. Temperature may have an impact on a particle's mobility inside a specific solid. The time elapsed between two subsequent electron collisions in a conductor when current is flowing through it is known as the relaxation time. The diffusion coefficient regulates the velocity of this mass transfer process known as mixing. As a result, one of the most crucial factors in accurately characterising solvent-based recovery procedures is the diffusion coefficient.
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