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!