5. Assuming an internal quantum efficiency of 1, compare a silicon pn-junction photodiode to a silicon...

 

Transcribed Image Text:

5. Assuming an internal quantum efficiency of 1, compare a silicon pn-junction photodiode to a silicon Schottky junction photodiode by calculating the photocurrent and responsivity for each photodiode. Assume a perfect antireflection coating is on both devices. The optical power on the diodes is 2 (uW) at a wavelength of 500 (nm). For the pn-junction photodiode, the length of the p-type side is 0.5 (µm) and the minority carrier diffusion length on the p-type side is 200 (nm). The depletion width is 2.5 (µm), and on the n-type side the minority carrier diffusion length is 7 (um). For the Schottky junction, the depletion width is W = 2.5 (µm). For both diodes, the photocurrent can be calculated using: ²[e¯α(lp¯Le) — e¯α(lp+W+Ln)] Iph = qni T Po hv a. What is the photocurrent from the pn-junction photodiode? b. What is the responsivity of the pn-junction photodiode? C. What is the photocurrent from the Schottky junction photodiode? d. What is the responsivity of the Schottky junction photodiode? 5. Assuming an internal quantum efficiency of 1, compare a silicon pn-junction photodiode to a silicon Schottky junction photodiode by calculating the photocurrent and responsivity for each photodiode. Assume a perfect antireflection coating is on both devices. The optical power on the diodes is 2 (uW) at a wavelength of 500 (nm). For the pn-junction photodiode, the length of the p-type side is 0.5 (µm) and the minority carrier diffusion length on the p-type side is 200 (nm). The depletion width is 2.5 (µm), and on the n-type side the minority carrier diffusion length is 7 (um). For the Schottky junction, the depletion width is W = 2.5 (µm). For both diodes, the photocurrent can be calculated using: ²[e¯α(lp¯Le) — e¯α(lp+W+Ln)] Iph = qni T Po hv a. What is the photocurrent from the pn-junction photodiode? b. What is the responsivity of the pn-junction photodiode? C. What is the photocurrent from the Schottky junction photodiode? d. What is the responsivity of the Schottky junction photodiode?

Answer rating: 100% (QA)

Solution Iph qnet Po e CpLe hv 10 W x absorption coefficient of the material For silicon 10 cm at ... View the full answer