1：Experimental Design and Method Selection:

The HJ was grown using molecular beam epitaxy technique. A 1-μm-thick PbTe film was first grown on a BaF2 substrate, followed by an 80-nm-thick CdTe film. The photodetectors were fabricated using micro-nano technique.

2：Sample Selection and Data Sources:

The CdTe/PbTe HJ was grown without intended doping. The interface quality was studied by aberration-corrected scanning transmission electron microscope (AC-STEM).

3：List of Experimental Equipment and Materials:

Molecular beam epitaxy for HJ growth, micro-nano technique for device fabrication, SR570 and DHPCA-100 amplifiers for impulse response measurements, digital oscilloscope (TBS 1052B), and fs-pulse Yb:KGW laser for impulse photoresponse measurements.

4：Experimental Procedures and Operational Workflow:

The photoresponse spectra and impulse responses were measured with a grating monochromator, a globar illuminant, and lock-in amplifier. The time-traced impulse photoresponses were measured using fs-pulse laser beams of different wavelengths.

5：Data Analysis Methods:

The responsivity and detectivity were calculated from the photoresponse spectra and impulse responses. The noise equivalent power (NEP) and detectivity (D*) were calculated using specific equations.