Fig. 5: Performance metrics and benchmark comparisons.
From: Sub-pA dark current infrared photodetection enabled by polarized water-intercalated heterojunctions
a Measured noise current of the WSe2/H2O/PdSe2 device at temperatures ranging from 250 K to 350 K. The device maintains low noise current across this temperature range. The solid red line shows a linear relationship between frequency and current noise, indicating a 1/f noise characteristic. b Extracted responsivity of the device at different wavelengths. The bias voltage used is Vds = − 2 V, and the power densities used are their minimum power densities at different wavelengths. Inset: Calculated Ilight/Idark values at various wavelengths. The solid line represents a polynomial fit to these data, showing the responsivity trend with wavelength. c Specific detectivity of the device across the UV to MWIR range. Inset: Calculated noise equivalent power (NEP) at various wavelengths. The bias voltage used is Vds = − 2 V, and the power densities used are their minimum power densities at different wavelengths. The solid line represents a polynomial fit to these data, showing the responsivity trend with wavelength. d Comparison of dark current densities at room temperature for our water-intercalated device and various commercial infrared detectors, including HgCdTe, colloidal quantum dots (CQD), T2SL, and typical 2D materials. The water-intercalated device exhibits low dark current. Lines of different colors correspond to Rule 07, Rule 22, and Low 19 of the same color. Rule 07, an empirical formula for predicting the dark current density of high-performance HgCdTe detectors. Rule 22 and Low 19 are the updated versions of Rule 07. The gray shaded area represents the performance region of current 2D material-based infrared detectors. The dashed line corresponding to our device represents an extrapolation based on the characteristics of our device. e Comparative detectivity of our device with that of commercial MWIR detectors, demonstrating superior performance with detectivity values that exceed those of most commercial MWIR detectors. BILP, background-limited infrared performance.
