Zn3In2S6 quantum dots modified transparent Cu2O films/TiO2 orderly nanoarrays pn junction towards photovoltaic conversion enhancement.

The transparent Cu 2 O film/Zn 3 In 2 S 6 QDs/TiO 2 orderly nanoarrays pn junction has been prepared via a continuous hydrothermal-co-precipitation-sputtering method. As revealed, the as-prepared Cu 2 O/Zn 3 In 2 S 6 QDs/TiO 2 transparent pn junction (Cu 2 O/ZIS-3-TiO 2) exhibits highly transmittance of ∼85%, obvious photovoltaic conversion enhancement of ∼1.2 × 103 folds (IPCE of 1.17%) than intrinsic Cu 2 O/TiO 2 pn junction, and decent stability during 40000s′ continuous cycle, which can be mainly ascribed to that, the Zn 3 In 2 S 6 QDs with appropriate Fermi level, high quantum yields and wide band gap, can optimize the photo-generated carrier concentration-mobility kinetic equilibrium efficiently, while maintaining a high transparency. Additionally, TiO 2 orderly nanoarrays can provide carrier transportation pathway, increase solar efficiency and physical stability. [Display omitted] • High QY of Zn 3 In 2 S 6 QD can increase carrier injection to increase concentration. • Regulated potential of Zn 3 In 2 S 6 QD can act as transition layer to increase mobility. • Zn 3 In 2 S 6 QD can balance the transmittance and photovoltaic conversion. • TiO 2 orderly nanoarrays can increase stability and solar efficiency. [ABSTRACT FROM AUTHOR]