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Zn x Cd 1-x Se@ZnO hollow spheres (HS) were successfully fabricated for application in quantum dot sensitized solar cells (QDSSCs) based on ZnO HS through the ion-exchange process. The sizes of the Zn x Cd 1-x Se@ZnO HS could be tuned from ~300 nm to ~800 nm using ZnO HS pre-synthesized by different sizes of carbonaceous spheres as templates. The photovoltaic performance of QDSSCs, especially the short-circuit current density (J sc ), experienced an obvious change when different sizes of Zn x Cd 1-x Se@ZnO HS are employed. The Zn x Cd 1-x Se@ZnO HS with an average size distribution of ~500 nm presented a better performance than the QDSSCs based on other sizes of Zn x Cd 1-x Se@ZnO HS. When using the mixture of Zn x Cd 1-x Se@ZnO HS with different sizes, the power conversion efficiency can be further improved. The size effect of the hollow spheres, light scattering, and composition gradient structure Zn x Cd 1-x Se@ZnO HS are responsible for the enhancement of the photovoltaic performance.

Synthesis of ZnxCd1-xSe@ZnO Hollow Spheres in Different Sizes for Quantum Dots Sensitized Solar Cells Application