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Problem 4: Narrow-Base Diode Consider an ideal pn* step-junction Si diode maintained at 300K with cross-sectional...
A Si PN junction diode has constant doping at both sides, Na and Nd in P...
A Si PN junction diode has constant doping at both sides, Na and Nd in P and N side, respectively. The width of the P side is W and the width of the N side is L: W << Le and L >> Lh. Le and Lh are the minority carrier diffusion length in each side. The lifetime of both minority carriers is τ. Assume the contacts at both ends of the PN junction are Omic contact. The PN junction...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018 cm-3 on the p-side and donor concentration of Nj on the n-side. The diode is forward biased and has a voltage of 0.6 V across it. The diode cross-sectional area is 1 mm2. The minority carrier recombination time, T, depends on the total dopant concentration, Ndopant (cm), through the following approximate empirical relation (5x 10-7)/(1 + 2 10-17N1°pan.) where T is in seconds. (a)...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018 cm-3 on t...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018 cm-3 on the p-side and donor concentration of Nj on the n-side. The diode is forward biased and has a voltage of 0.6 V across it. The diode cross-sectional area is 1 mm2. The minority carrier recombination time, T, depends on the total dopant concentration, Ndopant (cm), through the following approximate empirical relation (5x 10-7)/(1 + 2 10-17N1°pan.) where T is in seconds. (a)...
this is a problem of semiconductor device and fundamentals. Problem 4: pn Junction Current Distributions Consider a...
this is a problem of semiconductor device and
fundamentals.
Problem 4: pn Junction Current Distributions Consider a Si pn step junction diode maintained at room temperature, with p-side and n-side dopant concentrations NA 1016 cm3 and Np-2x1016 cm3, respectively. (You may assume that each side is uncompensated.) The minority carrier recombination lifetimes are τ,-10-6 s and τ,-10-7 s on the p-side and n-side, respectively a) Calculate the minority carrier densities at the edges of the depletion region when the applied...
Consider a silicon pn step junction diode with NA-1x1018 cm3 and No 1x1017cm-3, maintained at T...
Consider a silicon pn step junction diode with NA-1x1018 cm3 and No 1x1017cm-3, maintained at T 300K. The minority carrier lifetimes in the p-side and n-side are τη-10-8 s and Tp-10-7 s, respectively. a) Calculate the minority carrier densities at the edges of the depletion region when the applied voltage (VA) is 0.6 V. of the junction, for the applied bias voltage of part (a) densities are equal in magnitude, for the applied voltage of part (a). b) Sketch the...
The parameters of a pn junction diode at 300K are listed in the following table, the...
The parameters of a pn junction diode at 300K are listed in the following table, the cross section area of the junction is 105 cm2 n region N10" cm Hu = 850 cm?/V-s p region t,e = 10-6 s ,1" 1250 cm2/V-s 11,-420 cm2/V-s 320 cm/V-s (a) Sketch a band diagram at equilibrium (b) Find the reserve saturation current (c) Find the ideal diode current with forward bias voltage at 0.5 V and 0.7 V, respectively. (d) Find the current...
1) Useful parameters for CdTe a. ni- 1e8 cm 3 2) kT 25.8mev Problem #1 (100 points) Consider an ideal, long-diode type solar cell made of a CdTe abrupt asymmetrical PN junction. The relevant properti...
1) Useful parameters for CdTe a. ni- 1e8 cm 3 2) kT 25.8mev Problem #1 (100 points) Consider an ideal, long-diode type solar cell made of a CdTe abrupt asymmetrical PN junction. The relevant properties of the p-type CdTe absorber are: thickness - 3 um, doping - le14 cm3, electron mobility 100 cm2/V/s, and electron lifetime 10 ns. The n type region is doped much higher than CdTe 1. Calculate the saturation current density 2. Calculate the short-circuit current, assuming...
Problem 3: pn Junction -- Carrier Concentration Profiles The steady-state carrier concentrations inside a Si pn step ju...
Problem 3: pn Junction -- Carrier Concentration Profiles The steady-state carrier concentrations inside a Si pn step junction diode maintained at room temperature are shown in the plot below: п or p (log scale Pp -106 10 102 a) Is the diode forward or reverse biased? Explain briefly. b) Do low-level injection conditions prevail in the quasi-neutral regions of the diode? Explain briefly. c) What are the p-side and n-side net dopant concentrations NA and ND, respectively? d) Determine the...
4.15 A PN diode with lengths much larger than the carrier diffusion length such as shown...
4.15 A PN diode with lengths much larger than the carrier diffusion length such as shown in Fig. 4-18 is called a long-base diode. A short-base diode has lengths much shorter than the diffusion lengths, and its excess carrier concentration is similar to that shown in Fig. 8-6. A uniformly doped short-base Si diode has Nd- 101cm-3and Na 1016cm3. tp n1 us, Dp 10 cms, Dn 30 cm-s, and cross-sectional area10 cm. The length of the quasi-neutral N-type and P-type...
2. (60 pts) Consider a one-sided silicon PN diode. The p-side is degenerately doped (and you...
2. (60 pts) Consider a one-sided silicon PN diode. The p-side is degenerately doped (and you can assume Ep = Ey for simplicity). The doping concentration on the n-side is Np for 0<x <too. The depletion width on the n-side is xn. Use the depletion approximation. p* ND x 0 From here, you assume that Np is given by 4x1015 cm. (h) (7 pts) What is the maximum electric field in depletion region when Va=-3 V? (i) (8 pts) As...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018 cm-3 on the p-side and donor concentration of Nj on the n-side. The diode is forward biased and has a voltage of 0.6 V across it. The diode cross-sectional area is 1 mm2. The minority carrier recombination time, T, depends on the total dopant concentration, Ndopant (cm), through the following approximate empirical relation (5x 10-7)/(1 + 2 10-17N1°pan.) where T is in seconds. (a)...
3.13 Si pn junction Consider a long pn junction diode with an acceptor doping Naof 1018 cm-3 on the p-side and donor concentration of Nj on the n-side. The diode is forward biased and has a voltage of 0.6 V across it. The diode cross-sectional area is 1 mm2. The minority carrier recombination time, T, depends on the total dopant concentration, Ndopant (cm), through the following approximate empirical relation (5x 10-7)/(1 + 2 10-17N1°pan.) where T is in seconds. (a)...
this is a problem of semiconductor device and
fundamentals.
Problem 4: pn Junction Current Distributions Consider a Si pn step junction diode maintained at room temperature, with p-side and n-side dopant concentrations NA 1016 cm3 and Np-2x1016 cm3, respectively. (You may assume that each side is uncompensated.) The minority carrier recombination lifetimes are τ,-10-6 s and τ,-10-7 s on the p-side and n-side, respectively a) Calculate the minority carrier densities at the edges of the depletion region when the applied...
Consider a silicon pn step junction diode with NA-1x1018 cm3 and No 1x1017cm-3, maintained at T 300K. The minority carrier lifetimes in the p-side and n-side are τη-10-8 s and Tp-10-7 s, respectively. a) Calculate the minority carrier densities at the edges of the depletion region when the applied voltage (VA) is 0.6 V. of the junction, for the applied bias voltage of part (a) densities are equal in magnitude, for the applied voltage of part (a). b) Sketch the...
The parameters of a pn junction diode at 300K are listed in the following table, the cross section area of the junction is 105 cm2 n region N10" cm Hu = 850 cm?/V-s p region t,e = 10-6 s ,1" 1250 cm2/V-s 11,-420 cm2/V-s 320 cm/V-s (a) Sketch a band diagram at equilibrium (b) Find the reserve saturation current (c) Find the ideal diode current with forward bias voltage at 0.5 V and 0.7 V, respectively. (d) Find the current...
1) Useful parameters for CdTe a. ni- 1e8 cm 3 2) kT 25.8mev Problem #1 (100 points) Consider an ideal, long-diode type solar cell made of a CdTe abrupt asymmetrical PN junction. The relevant properties of the p-type CdTe absorber are: thickness - 3 um, doping - le14 cm3, electron mobility 100 cm2/V/s, and electron lifetime 10 ns. The n type region is doped much higher than CdTe 1. Calculate the saturation current density 2. Calculate the short-circuit current, assuming...
Problem 3: pn Junction -- Carrier Concentration Profiles The steady-state carrier concentrations inside a Si pn step junction diode maintained at room temperature are shown in the plot below: п or p (log scale Pp -106 10 102 a) Is the diode forward or reverse biased? Explain briefly. b) Do low-level injection conditions prevail in the quasi-neutral regions of the diode? Explain briefly. c) What are the p-side and n-side net dopant concentrations NA and ND, respectively? d) Determine the...
4.15 A PN diode with lengths much larger than the carrier diffusion length such as shown in Fig. 4-18 is called a long-base diode. A short-base diode has lengths much shorter than the diffusion lengths, and its excess carrier concentration is similar to that shown in Fig. 8-6. A uniformly doped short-base Si diode has Nd- 101cm-3and Na 1016cm3. tp n1 us, Dp 10 cms, Dn 30 cm-s, and cross-sectional area10 cm. The length of the quasi-neutral N-type and P-type...
2. (60 pts) Consider a one-sided silicon PN diode. The p-side is degenerately doped (and you can assume Ep = Ey for simplicity). The doping concentration on the n-side is Np for 0<x <too. The depletion width on the n-side is xn. Use the depletion approximation. p* ND x 0 From here, you assume that Np is given by 4x1015 cm. (h) (7 pts) What is the maximum electric field in depletion region when Va=-3 V? (i) (8 pts) As...
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