Fig. 4. Photodetection property.
a Dark currents on LWIR and VLWIR CQD devices at 3 V bias as function of the reciprocal of temperature, respectively. b The responsivity and pure photocurrent to dark current ratio (on/off ratio) as function of temperature on VLWIR and LWIR CQD devices, respectively. c Detectivity variation with time on LWIR CQD device with (black) and without (blue) I2-treatment. d The temporal response of LWIR CQD device, exposed to objects with different temperatures. e, f Imaging process and thermal imaging by VLWIR CQD device