4-Justin Norvelll-Photodiodes

4-Justin Norvelll-Photodiodes - Justin Norvell gtg751r ECE...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Justin Norvell gtg751r ECE 3080 Spring 2008
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
z Photodiode: A light sensing semiconductor that can produce electrical current or voltage from photons.
Background image of page 2
z Non-Reflective Coating - Non-reflective layer made of silicon monoxide or silicon dioxide - High refractive index between air and most semiconductors z P-Type Material z Intrinsic Material z N-Type Material
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
z Photons enter the diode through the non reflective coating and p layer into the depletion region z Photons excite free electrons and holes z Carriers move to cathode and anode creating current
Background image of page 4
z Photocurrent due to absorption in the depletion region z Photocurrent due to absorption in the quasi- neutral region z Dark Current
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
z Photovoltaic - Allows dark current to flow - Used for solar cells z Photoconductive - Faster response times - Low noise z Avalanche Photodiode - High reverse bias voltage - Increases the effective responsivity
Background image of page 6
z The Material Used Determines the Wavelength - Because of this unwanted spectrums can be ignored by design - Unfortunately this also means that
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

4-Justin Norvelll-Photodiodes - Justin Norvell gtg751r ECE...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online