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Opticial Transducers: Photodetectors Photodetectors Eidgenössische Technische Hochschule Zürich – 15 th December 2004
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Opticial Transducers: Photodetectors
Photodetectors
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Outline Of Presentation
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th 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 – 15th 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 – 15th December 2004
Photoconductor
Overview Of Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th December 2004
pn-Photodiode
Overview Of Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th December 2004
pin-Photodiode
Overview Of Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Hetero-Structure Photodiode
Overview Of Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Schottky-Barrier Photodiode
Overview Of Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Avalanche Photodiode
Outline Of Presentation
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th 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 – 15th December 2004
Response Time
Description Of Key Properties
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Technology
Description Of Key Properties
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Gain
Description Of Key Properties
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Noise & SNR
Description Of Key Properties
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Spectral Response
Outline Of Presentation
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th 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 – 15th December 2004
Photoconductor
+ internal gain
+ simple fabricatin
- poor transient response
- doping levels are critical
Comparsion Between Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th 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 – 15th December 2004
Heterojunction Photodiode
+ fast response
+ good quantum effiecieny
- complex technology
Comparsion Between Photodetector Types
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th December 2004
Avalanche Photodiode
+ internal gain
+ fast response
+ high gain-bandwith product
- local breakdown
- poor SNR
Outline Of Presentation
Eidgenössische Technische Hochschule Zürich – 15th 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 – 15th 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 – 15th December 2004
Noise
Noise
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Noise
Noise
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Noise
Noise
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Noise
Noise
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Noise
Opticial Transducers: Photodetectors
Questions?
Eidgenössische Technische Hochschule Zürich – 15th December 2004
Thanks for your
attention!
