In the cleanroom, a SiO2 layer of 2um thick is deposited on a <100 silicon substrate using CVD process. The structure is then oxidized at 950 C for 80 minutes in an H2O ambient. Calculate the thickness of the final oxide layer.
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- Don't copy others work. provide correct solution Question (1)(a) Define homo-structure and hetero-structure devices with appropriate schematic diagram of such structures. (b) Explain the concepts of lattice matched hetero-structure. Sub: Optoelectronics Dept:EEEFigure Q4 shows the silicon wafer. This silicon has been added with the two elements as listed in Table Q3. Identify the majority charge carrier in each extrinsic silicon wafer and justify your answer with illustrations.At what temperature will intrinsic silicon become an insulator, based on the definitions in Table ? Assume that μn = 1800 cm2/V·s and μp = 700 cm2/V·s.
- A practical silicon-based solar cell is constructed from a n+ p junction. a. Explain briefly the meaning of the notation n+ ? b. Draw a sketch showing the device structure of this solar cell. c. This cell shows a photocurrent IL = 10.9 A under AM1.5G illumination.If the temperature is 25oC, what is VOC ? Assume that the saturatedcurrent IS = 1×10-9 A.The resistance of copper wire with alpha = 0.00393/Co at 20oC is 129 Ω. At 78 oC, its resistance would be about ___.A string of 8 suspension insulators is to be fitted with a grading ring. If the pin to earth capacitances are all equal to C, find the values of line to pin capacitances that would give a uniform voltage distribution over the string.
- Indicate a total of 8 factors that determine the breakdown strength in liquid insulators; Explain by drawing the effect of 'electrode shape and opening' expression on breakdown resistance.At what temperature will intrinsic silicon become a conductor based on the definitions in Table ? Assume that μn=120 cm2/V·s and μp = 60 cm2/V·s. (Note that silicon melts at 1430 K.)A semiconductor substrate of 1 mm2 cross section is used to design a resistor. The doped-p concentration is 5'10^16 at/cm^3. and μp=500cm^2/Vxs We ask:(a) Calculate the electrical resistance for dimensions a= 100 mm, l= 500 mm, e= 0.1 mm.(b) The current density circulating for a voltage of 5 V.(c) The dopant concentration for R= 100 W.
- Please make a concept map of the covalent link theme for semiconductors with the following subtopics, you can add tables, graphs, images, or things you think are relevant 1.5 Driving process 1.5.0 Introduction 1.5.1 Mobility 1.5.2 Relationships between carrier equilibrium concentrations 1.5.3 Detailed balance principle 1.5.4 Carrier equilibrium concentrations in homogeneous semiconductors 1.5.5 Conductivity 1.5.6 Hall EffectUsing the idea of energy bands in solid materials, explain the characteristics of the followingmaterialsa) conductorsb) insulatorsc) semiconductorsIn the neighborhood of a certain semiconductor junction, the volume charge density is given by Py = 750Sech10^6 pi * tanh10^6 pix C/m³. The dielectric constant of the semiconductor material is 10 and the junction area is 2 x 10^-7m². Find; (a) Vo; (b) C; (c) E at the junction.