Quantum efficiency of InSbBi quantum dot photodetector.

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Quantum dot (QD) photodetectors offer tunable optoelectronic properties.
• Indium antimonide (InSb) is a key material for infrared detection.
• Bi-substituted InSb QDs present opportunities for novel photodetector designs.

Purpose of the Study:

• To model the quantum efficiency (QE) of InSb(1-x)Bi(x) quantum dot photodetectors.
• To investigate the impact of bismuth (Bi) incorporation on absorption and QE.
• To determine the effect of Bi content on the detection wavelength.

Main Methods:

• Theoretical modeling of quantum efficiency.
• Derivation of electron and hole density relations.
• Calculation of absorption in p-, n-, and depletion regions.
• Analysis of absorption contributions to QE.

Main Results:

• Bismuth incorporation significantly increases absorption and QE in InSb QDs.
• Higher Bi content leads to extended cutoff detection wavelengths.
• The study quantifies the contribution of different regions to the overall QE.

Conclusions:

• Bismuth-substituted InSb quantum dots are promising for enhanced photodetector performance.
• Tuning Bi content allows for control over absorption, QE, and detection wavelength.
• This work provides a theoretical foundation for designing next-generation infrared photodetectors.