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A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±2ln , where ln = 10-4 cm is the diffusion length of electrons. Assume electronic charge, q = -1.6 x 10-19C . The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (?) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2In is _________ mA/cm2
(round off to two decimal places).
  • a)
    0.57
  • b)
    0.61
Correct answer is between '0.57,0.61'. Can you explain this answer?
Most Upvoted Answer
A p-type semiconductor with zero electric field is under illumination...
Given
(i) p- Type semiconductor
(ii) Diffusion length of electrons, ln = 10-4 cm
(iii) Photo generation exist only between -ln to ln
(iv) Rate of recombination is exponential decay.
(v) No recombination and no generation exist between ln to 2ln and -ln to -2ln
Given diagram is shown below.
Excess minority carrier concentration is given by,
Differentiating excess minority carrier concentration n'(x) profile.
From continuity equation,
Hence, equations (i) becomes,
Where, G Photo generation rate (cm-3 /s) , R = Excess minority carrier recombination rate (cm-3 /s) .
From equation (ii),
Integrating both sides,
Putting C = -1020In l in equation (iii).
From excess minority carrier concentration profile,
From equation (iii),
Electron current density at x = 2ln is given by,
Hence, the correct answer is 0.58.
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Community Answer
A p-type semiconductor with zero electric field is under illumination...
Given
(i) p- Type semiconductor
(ii) Diffusion length of electrons, ln = 10-4 cm
(iii) Photo generation exist only between -ln to ln
(iv) Rate of recombination is exponential decay.
(v) No recombination and no generation exist between ln to 2ln and -ln to -2ln
Given diagram is shown below.
Excess minority carrier concentration is given by,
Differentiating excess minority carrier concentration n'(x) profile.
From continuity equation,
Hence, equations (i) becomes,
Where, G Photo generation rate (cm-3 /s) , R = Excess minority carrier recombination rate (cm-3 /s) .
From equation (ii),
Integrating both sides,
Putting C = -1020In l in equation (iii).
From excess minority carrier concentration profile,
From equation (iii),
Electron current density at x = 2ln is given by,
Hence, the correct answer is 0.58.
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A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±2ln , where ln = 10-4 cm is the diffusion length of electrons. Assume electronic charge, q = -1.6 x 10-19C . The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (?) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2In is _________ mA/cm2(round off to two decimal places).a)0.57b)0.61Correct answer is between '0.57,0.61'. Can you explain this answer?
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A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±2ln , where ln = 10-4 cm is the diffusion length of electrons. Assume electronic charge, q = -1.6 x 10-19C . The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (?) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2In is _________ mA/cm2(round off to two decimal places).a)0.57b)0.61Correct answer is between '0.57,0.61'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±2ln , where ln = 10-4 cm is the diffusion length of electrons. Assume electronic charge, q = -1.6 x 10-19C . The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (?) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2In is _________ mA/cm2(round off to two decimal places).a)0.57b)0.61Correct answer is between '0.57,0.61'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = ±2ln , where ln = 10-4 cm is the diffusion length of electrons. Assume electronic charge, q = -1.6 x 10-19C . The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (?) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2In is _________ mA/cm2(round off to two decimal places).a)0.57b)0.61Correct answer is between '0.57,0.61'. Can you explain this answer?.
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