Fig. 4: Characteristics of discrete NIR-sensitive OPDs.

a, J–V sweep measured at a scan rate of 5 mV s⁻¹ in dark (blue) and under light (850 nm with a light intensity of 0.28 mW cm⁻²; grey). The scan direction is indicated with the arrowheads. The inset shows the J–V sweep reconstructed from static measurements at discrete biases. b, Linearity plot measured at −2 V, showing the photocurrent density J_photo minus the dark current density J_dark as a function of light intensity from 200 nW cm⁻² to 0.8 mW cm⁻². c, EQE as a function of wavelength measured at −2 V. d, Spectral responsivity (SR; closed circles) and detectivity D* (open circles) measured at −2 V.