Msm Photo-detector

MSM PHOTO-DETECTORS

Presented By: Mayank Jha

MSM detector  

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Metal-SemiconductorMetal detector Two Schottky diodes back to back (bipolar) nA dark current Smaller capacitance per unit area than PIN Planarity Semiconductor can be MSM Photo-detector of Si,GaAs etc.

Principle of operation of MSM Positive Bias Current Direction

Negative Bias Light Metal Semiconductor

Metal Semiconductor

E field

Metal

Current Direction Gnd

Metal

Current Gnd

•For the same light shining on the detector elements 8Positive bias leads to a positive signal 8Negative bias leads to a negative signal MSM Photo-detector

Advantages and drawbacks of MSM detector 

Advantages High Speed  Higher Bandwidth  Ease of fabrication  Cheap 

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Drawbacks  Low

Responsivity  Reduced active area  Low quantum efficiency 

MSM Photo-detector

A Comparative Study of Si and GaAs Metal-Semiconductor-Metal Photodetectors

MSM Photo-detector

Simple Specifications for an MSM detector

MSM Photo-detector

Conclusion  

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Only used for some low cost application Area of intensive research and development Can compete commercially in near future

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MSM Photo-detector

Bibliography 

DeCusatis, Casimer II, Fiber Optic Essentials, Elsevier : London,2006

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http://www.rpphotonics.com/metal_semiconductor_metal_photodet ectors.html

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http://209.85.229.132/search? q=cache:p3cbHVBb23kJ:yuba.stanford.edu/or/documents/tunab le1_feb03.ppt+msm+detector&cd=2&hl=ne&ct=clnk&gl=np

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http://www.newport.com/Support/Magazine_Features/pdf/90390459.pdf

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Mynbaev, Djafar K. II, Fiber-Optic Communications Technology, Pearson Education : Delhi, 2001

MSM Photo-detector

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