One integrated circuit design calls for the diffusion of arsenic into silicon wafers; the background concentration of As in Si is 2.5 x 1020 atoms/m. The predeposition heat treatment is to be conducted at 1000°C for 45 minutes, with a constant surface concentration of 8x 10^26 As atoms/m³. At a drive in temperature of 1100°C, determine the diffusion time required for a junction depth of 1.21m. For this system, values of Q and Do are 4.10 eV and 2.29x10^3m/s, respectively.
The diffusion time that is needed for the junction depth of 1.21 m is given as 13875 seconds
How to solve for the diffusion timebackground concentration of As in Si is 2.5 x 10²⁰ atoms/m
tp = 1000°c
tp = 45 minutes
= 45 x 60 seconds
surface concentration = 8x 10^26
Td = 1100°c
Junction depth = 1.2
= 1.2 x 10⁻⁶m
qd = 4.10ev
Do = 2.29 x 10⁻³
We have to use the equation
[tex]Dp = Doexp(-\frac{qd}{kTP} )\\\\= (2.23 * 10^-^1^3 m^2/s) exp [-\frac{4.10}{8.62*10^-^5 *(1000+273)} ][/tex]
= 1.36 x 10⁻¹³
From the relation that we have here
[tex]Qo = 2cs\sqrt{\frac{Dpte}{pi} } \\\\= 2 * 8* 10^2^6*\sqrt{\frac{1.36*10^-^1^3(45*60)}{pi} }[/tex]
Qo = 1.73 x 10¹³
Dd at 1100
[tex]Dd = 2.29*10^-^3exp(\frac{-4.10}{8.62x10^-^5)(1100 + 273)}[/tex]
Dd = 2.06 x 10⁻¹⁸m²/s
From the relation we have
[tex]exp[\frac{(1.2 * 10^-^6)^2}{4*(2.06x10^-^1^8)+d} ]=\frac{1.73*10^1^9}{2.5x10^2^0*\sqrt{pi*2.06*10^-^1^8x+d} }[/tex]
[tex]ln\frac{2.72*10^7}{\sqrt{+d} } =\frac{1.75*10^5}{+d}[/tex]
Using heat and trial, we would have the value of +d = 13875 seconds
The diffusion time is 13875 seconds
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Which type of power system should Gavin use to create the device in the following scenario?
Gavin is designing a device that must rely on precise movements. It must have the force to cut through metal yet be safe enough for one person to hold steady on his or her own.
A. a fluid power system similar to one used in a pool pump
B. a hydraulic system similar to one used in a dump truck
C. a propulsion system similar to one used in a jet plane
D. a pneumatic power system similar to one used in a jackhammer
Given that Gavin is designing a device that must rely on precise movements. It must have the force to cut through metal yet be safe enough for one person to hold steady on his or her own. The type of power system should Gavin use to create the device in the following scenario is: " a fluid power system similar to one used in a pool pump" (Option A)
What is a Fluid Power system?A pressurized fluid bearing directly on a piston in a cylinder or in a fluid motor does work in fluid power systems. A fluid cylinder generates force, which results in linear motion, whereas a fluid motor generates torque, which results in rotating motion.
Fluid power may be utilized for exceedingly difficult work like drilling new underground mining tunnels, as well as very gentle operations like lifting and stacking enormous sheets of glass. Fluid power systems may push, pull, lift, twist, or grasp practically any load using different components and actuators.
Fluid power systems are classified into two types: hydraulic equipment, which use liquids such as water and oil, and pneumatic systems, which use neutral gases such as air.
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what is the best toontown server
Answer:
Not related to homework help
Explanation:
Answer:
not related to homework
Where would you find the exhaust port on this model?
Answer: on the top maybe
Explanation:
i think i help you
The Construction Engineering Research Laboratory (CERL) of the Army Corps's Engineering Research and Development Center has done technology transfer work that has advanced the green building industry.
True or False
Answer:
true
Explanation:
because it's true.. the government is the best
What is the key to repairing large areas of vehicle damage?
A) Break down the damage into separate repair categoriesB) Repair the most expensive area lastC) Repair the vehicle over several daysD) Repair the most difficult area first
The key to repairing large areas of vehicle damage is option A) Break down the damage into separate repair categories.
What is the Repair order of the areas of vehicle that is damage about?The repair order is known to be one that often Summarizes or breakdown the repair instructions
Note that in regards to the Metal working areas, this is said to be one that can be found or seen in the shop where the said damaged parts are known to be removed, repaired, as well as installed.
Thus, there must be a summary of what is to be done. Hence, option A is correct.
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DRIVERS ED PLEASE HELP
The interactive activities in this course .
will
be tested in the final exam but not the lesson quizzes
will be scored by your instructor
will be tested in lesson quizzes but not the final exam
will not be scored
Submit answer
Explanation:
bro don't ask people for this you will get a bad grade if the host finds that you cheated
will model creation phase will aid in cost savings during development. true or false
Answer:True
Explanation:
Because he is concerned about building materials entering the marketplace that are marketed as sustainable or renewable but that aren't really any such thing, Rafael of Incipient Renewable Construction creates a consumer watchdog group to identify such products. The group rates products on a scale that indicates how reliable the green claims for the products are. He wants to force the makers and suppliers of
these materials to either be more honest about their claims or pull these products from the market. Rafael's efforts will be most effective at improving which of the following? (Select all that apply.)
O consumer confidence regarding green materials and technology
O coordination between voluntary consumer groups and government agencies
O industry knowledge regarding green building products
O research efforts into new green building products
Because Rafael is concerned about building materials entering the marketplace that are marketed as sustainable or renewable but that isn't really any such thing, Rafael of Incipient Renewable Construction creates a consumer watchdog group to identify such products.
Rafael's efforts which can be described as consumer advocacy will be most effective at improving:
consumer confidence regarding green materials and technology (Option A)industry knowledge regarding green building products. (Option C)What is consumer confidence?Consumer confidence surveys are important measures of the economy's overall health. When people are secure in the consistency of their earnings, it affects their spending and saving habits.
A Consumer Watchdog organization's responsibilities include the following:
Conduct educational and research initiatives, as well as litigation, on consumer and public interest problems, including, but not limited to, consumer safety and government reform, and make the results of such research available to the public.
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The best designed saw for cutting miter joints is a
O handsaw
O backsaw
O coping saw
O hacksaw
Answer:
backsaw
Explanation:
The best designed saw for cutting miter joints is a backsaw. The correct option is 2.
What is a backsaw?Any hand saw having a stiffening rib on the edge opposite the cutting edge—known as a backsaw—enables better control and more accurate cutting than other saws.
For precise tasks like cutting dovetails, mitres, or tenons in cabinetry and joinery, backsaws are typically employed in woodworking.
Its teeth have sharp, knife-like points because they are beveled on both sides, which cuts through the fibers of the wood.
The down stroke of the crosscut saw is also used to cut. The backsaw features a small, squared-off blade that is about a foot long, and to maintain the blade straight, a sheet steel reinforcing strip is wrapped over the back of the blade.
Thus, the correct option is 2.
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Your question seems incomplete, the probable complete question is:
The best designed saw for cutting miter joints is a
O handsawO backsawO coping sawO hacksaw