Opticial Transducers: Photodetectors Photodetectors Eidgenössische Technische Hochschule Zürich – 15 th December 2004

Outline Of Presentation Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Outline of presentation 1.Overview of photodetector types 2. Description of key properties 3. Comparision between photodectector types 4. Noise

Outline Of Presentation Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Outline of presentation 1.Overview of photodetector types 2. Description of key properties 3. Comparision between photodectector types 4. Noise

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Overview of Types 1. Photoconductor 2. pn-Photodiode 3. pin-Photodiode 4. Hetero-Structure Photodiode 5. Scottky-Barrier Photodiode 6. Avalanche Photodiode (APD)

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Photoconductor

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 pn-Photodiode

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 pin-Photodiode

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Hetero-Structure Photodiode

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Schottky-Barrier Photodiode

Overview Of Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Avalanche Photodiode

Outline Of Presentation Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Outline of presentation 1.Overview of photodetector types 2. Description of key properties 3. Comparision between photodectector types 4. Noise

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Description of key properties 1. Spectral Response 2. Response Time (Speed) 3. Technology 4. Gain 5. Noise & SNR

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Response Time

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Technology

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Gain

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise & SNR

Description Of Key Properties Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Spectral Response

Outline Of Presentation Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Outline of presentation 1.Overview of photodetector types 2. Description of key properties 3. Comparision between photodectector types 4. Noise

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Comparsion 1. Photoconductor 2. pn-Photodiode 3. pin-Photodiode 4. Hetero-Structure Photodiode 5. Scottky-Barrier Photodiode 6. Avalanche Photodiode (APD)

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Photoconductor + internal gain + simple fabricatin - poor transient response - doping levels are critical

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 pn - Photodiode + moderate speed + high SNR at low levels - no internal gain - poor spectral range - junction technology

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 pin - Photodiode + fast response + high quatum effiency - large dark current - trade-off: fast or high quantum effiency

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Heterojunction Photodiode + fast response + good quantum effiecieny - complex technology

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Schottky-Barrier Photodiode + fast response + effiecient at low wavelengths + large bandwiths - high reflectance at metal layer - complex technology

Comparsion Between Photodetector Types Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Avalanche Photodiode + internal gain + fast response + high gain-bandwith product - local breakdown - poor SNR

Outline Of Presentation Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Outline of presentation 1.Overview of photodetector types 2. Description of key properties 3. Comparision between photodectector types 4. Noise

Noise Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise 1. Noise 1 2. Noise 2 3. Noise 3 4. Noise 4 5. Noise 5 6. Noise 6

Noise Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise

Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise

Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise

Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise

Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Noise

Opticial Transducers: Photodetectors Questions? Eidgenössische Technische Hochschule Zürich – 15 th December 2004 Thanks for your attention!