Uniform performance of high-efficiency room-temperature GaInAsSb/GaSb photodiodes for 1.75 < lambda < 2.2 mum

Area of Science:

• Optoelectronics
• Semiconductor Devices
• Infrared Technology

Background:

• Gallium Indium Arsenide Antimonide (GaInAsSb) is a key material for photodetectors operating in the mid-infrared spectrum.
• Advancements in photodetector technology are crucial for applications in sensing, imaging, and communication.

Purpose of the Study:

• To assemble and evaluate a batch of experimental, packaged, back-illuminated GaInAsSb mesa photodetectors.
• To characterize the room-temperature performance of these photodetectors.

Main Methods:

• Fabrication of approximately 85-microm diameter GaInAsSb mesa structures.
• Packaging and back-illumination of 126 photodetector units.
• Measurement of key performance parameters including quantum efficiency, capacitance, and dark current at room temperature.

Main Results:

• Achieved an average peak quantum efficiency of 86%.
• Measured an average zero-bias capacitance of 3.9 pF.
• Recorded an average dark current of 7.4 microA at -0.5 V bias.

Conclusions:

• The evaluated GaInAsSb photodetectors exhibit promising performance characteristics for infrared detection.
• The high quantum efficiency and manageable dark current suggest suitability for various optoelectronic applications.
• Further development could optimize these devices for specific wavelength ranges and operational conditions.