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Classical free electron model The classical free electron model of metals treats conduction electrons as "a...
4. A photon of light can excite an electron from the valence band to the conduction...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
4. A photon of light can excite an electron from the valence band to the conduction...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
Question 11- M2 (8 marks) 11.1) (2 marks) What is the maximum band gap that a...
Question 11- M2 (8 marks) 11.1) (2 marks) What is the maximum band gap that a material may exhibit and remain fully opaque? Band gap 11.2) (4 marks) The precious gem, Ruby, is bright red in colour. Ruby is made of Alumina (Al2O3 - band gap of 8eV) with a few Cr atoms for every 10,000 Al and O atoms. A semiconductor with a band gap of 1.8eV will also appear red in colour. Explain the origin of the 'red'...
The Drude and Sommerfeld models ignore the Coulomb interactions between the conduc- tion electrons and seem...
The Drude and Sommerfeld models ignore the Coulomb interactions between the conduc- tion electrons and seem also to neglect those between the conduction electrons and the ions They treat the conduction electrons as an ideal gas. This appears counter intuitive given that Coulomb interactions are a very strong force Later in band structure calculations, we will take into account the periodic potential pro- vided by the ions. The Coulomb repulsion between the electrons will be ignored throughout this course. What...
Fermi Energy Eqn. 4.22 in Kasap gives the Fermi energy (at 0 K) as is the conduction electron con...
Fermi Energy Eqn. 4.22 in Kasap gives the Fermi energy (at 0 K) as is the conduction electron concentration. This is equivalent to the equation we derived in class. Kasap Eqn. 4.23 gives the Fermi energy as a function of temperature: EFEF1 a. If each copper atom contributes one conduction electron, what is the Fermi energy of copper at 29:3 b. Since this Fermi energy was derived from the Sommerfeld model, the energy is entirely kinetic 12 LEFo K? energy...
Hi everyone, I have a problem about semiconductor. Please help me with it,thanks a lot. Background:...
Hi everyone, I have a problem about semiconductor.
Please help me with it,thanks a lot.
Background:
Question:
Physical Constants: Vacuum permittivity: £o = 8.85 x 10-14 F/cm Planck's constant: h=6.63 x 10-34 J-s Speed of light: c= 3.0 x 100 cm/s Electronic charge: q=1.60 x 10-19 C Electron rest mass: m. = 9.11 x 10-31 kg Boltzmann constant: kb = 1.38 x 10-23 J/K Thermal energy at 300 K: kBT = 0.0259 eV Energy unit conversion: 1eV = 1.60 x...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
1) Write a Reaction equation using 4- aminobenzenesulfulfonic acid (aniline derivative) and 8-ani...
1) Write a Reaction equation using 4- aminobenzenesulfulfonic
acid (aniline derivative) and 8-anilino-1-naphthalenesulfonic acid
(coupling agent). Write the mechanism.
SYNTHESIS OF AZO DYES INTRODUCTION Humans' love of color dates back almost to prehistoric times, yet it is not actually until the modern era that the full range of the rainbow has been accessible to the majority of people irn their clothes and other textiles. Ancient or medieval times have often been described as being quite splendid with their "tyrian purple"...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
Question 11- M2 (8 marks) 11.1) (2 marks) What is the maximum band gap that a material may exhibit and remain fully opaque? Band gap 11.2) (4 marks) The precious gem, Ruby, is bright red in colour. Ruby is made of Alumina (Al2O3 - band gap of 8eV) with a few Cr atoms for every 10,000 Al and O atoms. A semiconductor with a band gap of 1.8eV will also appear red in colour. Explain the origin of the 'red'...
The Drude and Sommerfeld models ignore the Coulomb interactions between the conduc- tion electrons and seem also to neglect those between the conduction electrons and the ions They treat the conduction electrons as an ideal gas. This appears counter intuitive given that Coulomb interactions are a very strong force Later in band structure calculations, we will take into account the periodic potential pro- vided by the ions. The Coulomb repulsion between the electrons will be ignored throughout this course. What...
Fermi Energy Eqn. 4.22 in Kasap gives the Fermi energy (at 0 K) as is the conduction electron concentration. This is equivalent to the equation we derived in class. Kasap Eqn. 4.23 gives the Fermi energy as a function of temperature: EFEF1 a. If each copper atom contributes one conduction electron, what is the Fermi energy of copper at 29:3 b. Since this Fermi energy was derived from the Sommerfeld model, the energy is entirely kinetic 12 LEFo K? energy...
Hi everyone, I have a problem about semiconductor.
Please help me with it,thanks a lot.
Background:
Question:
Physical Constants: Vacuum permittivity: £o = 8.85 x 10-14 F/cm Planck's constant: h=6.63 x 10-34 J-s Speed of light: c= 3.0 x 100 cm/s Electronic charge: q=1.60 x 10-19 C Electron rest mass: m. = 9.11 x 10-31 kg Boltzmann constant: kb = 1.38 x 10-23 J/K Thermal energy at 300 K: kBT = 0.0259 eV Energy unit conversion: 1eV = 1.60 x...
3.2 Periodic trends 1. (0620-5 2012-Paper 1/2-Q21) Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? forms coloured compounds conducts electricity when solid can be used has low density as a catalyst X A X X Xx 2. (0620-W 2012-Paper 1/1-Q20) The diagram shows an outline of the Periodic Table. U V W X Y Which of the elements U, V, W, X and Y would react together in the ratio of...
1) Write a Reaction equation using 4- aminobenzenesulfulfonic
acid (aniline derivative) and 8-anilino-1-naphthalenesulfonic acid
(coupling agent). Write the mechanism.
SYNTHESIS OF AZO DYES INTRODUCTION Humans' love of color dates back almost to prehistoric times, yet it is not actually until the modern era that the full range of the rainbow has been accessible to the majority of people irn their clothes and other textiles. Ancient or medieval times have often been described as being quite splendid with their "tyrian purple"...
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