Abstract
Hybrid organic–inorganic solar cells with planar heterostructure based on hydrothermal-synthesized CdS nanorods (CdS NRs) array and organometal trihalide perovskite CH3NH3PbI3 have been fabricated and characterized. Thermal annealing and Ultraviolet Ozone (UV–Ozone) treatment were applied to modify the surface of the CdS NRs, in which UV–Ozone treatment was proved to be more effective in improving the morphology of perovskite layer, as well as the charge transfer between CH3NH3PbI3 and CdS NRs. Devices structured as ITO/CdS NRs array/CH3NH3PbI3/2,29,7,79-Tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,99-spirobifluorene (spiro-MeOTAD)/MoO3/Ag produced short-circuit current density of 18.77mA/cm2, open-circuit voltage of 0.89V, and fill factor of 49.9%, leading to a best power conversion efficiency of 8.36% in the case of 10min UV–Ozone treatment.
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