Fig. 1. (Color online) Energy band diagram of one period of the QD-QCD.

Fig. 2. (Color online) PL spectrum of the simplified QD-QCD structure. The inset shows the AFM image of the QD layer.

Fig. 3. Normalized in-plane response ratio for QD-QCD from the [110] axis to the [11¯0] axis.

Fig. 4. (Color online) Photocurrent spectra of the QD-QCD at 77 and 300 K. The inset shows the peak responsivity of the device from 77 to 300 K in every 20 K.

Fig. 5. (Color online) I-V curves measured under dark condition at temperatures from 77 to 300 K in every 20 K.

Fig. 6. (Color online) Dependence of R0A and DJ* on temperature from 77 to 300 K.