Van der Waals mid-wavelength infrared detector linear array for room temperature passive imaging.

Area of Science:

• Materials Science
• Optoelectronics
• Infrared Technology

Background:

• Mid-wave infrared (MWIR) passive imaging offers atmospheric pollutant resistance and image clarity.
• Arrayed photodetectors enhance radiation sensing efficiency.
• Room temperature van der Waals (vdWs) photodetectors are advancing, but array implementation is needed.

Purpose of the Study:

• To develop an efficient and reliable vdWs photodetector linear array for MWIR passive imaging.
• To address the practical demand for arrayed vdWs photodetector devices.

Main Methods:

• Fabrication of an 8x1 black phosphorus/molybdenum sulfide (BP/MoS2) vdWs photodetector linear array using a temperature-assisted sloping transfer method.
• Achieved a fill-factor of approximately 77% with a flat interface and uniform thickness.
• Characterization of device performance, including peak detectivity (D*) in the MWIR region.

Main Results:

• The BP/MoS2 vdWs photodetector linear array demonstrated an average peak detectivity (D*) of 2.34 × 10^9 cm·Hz^1/2·W^-1.
• The array facilitated efficient carrier transport and minimized pixel nonuniformities.
• Push-broom scanning passive imaging using the array was eight times more efficient than single-pixel devices.
• Strip noise correction was effectively implemented using mean filtering and fast Fourier transform filtering.

Conclusions:

• The developed BP/MoS2 vdWs photodetector linear array is suitable for MWIR passive imaging applications.
• The fabrication method and device design offer guidance for engineering vdWs arrayed devices.
• The study highlights the potential of vdWs materials for advanced imaging systems.