Superior Photocurrent of Quantum Dot Sensitized Solar Cells Based on PbS : In/CdS Quantum Dots

Figure 5

(a) UV-vis absorption spectra of PbS : In QD (PbS : In = 0, 1 : 1, 5 : 1, 10 : 1, and 20 : 1) adsorbed TiO₂ and (b) Tauc plot calculated by using Kubelka-Munk equation from UV-vis absorption; (c) UPS spectra of PbS : In QD (PbS : In = 0, 1 : 1, 5 : 1, 10 : 1, and 20 : 1) adsorbed TiO₂ and extrapolation of low binding energy region. (d) Band-edge alignment diagram for PbS and PbS : In QDs. (e) Schematic illustration of the electron and hole transfer model for undoped PbS/CdS (i) and PbS : In/CdS (ii).

(a)

(b)

(c)

(d)

(e)