The building of ZnO double-shells hollow spheres for CdS quantum dots sensitized solar cell

Abstract

Using carbonaceous spheres as templates, the ZnO single-shell and double-shells hollow spheres (HS) have been successfully constructed and employed as architectures in CdS quantum dots sensitized solar cells (QDSSCs). The scanning electron microscope (SEM), elemental mapping, and transmission electron microscope (TEM) are used to analyze and confirm the microstructure of ZnO HS. The photovoltaic performance of QDSSC based on ZnO double-shells HS shows a 160% increase in power conversion efficiency than ZnO single-shell HS. Further investigation reveal that the enlarged surface area and multiple reflection light pathway offered by double-shell ZnO HS are responsible for the enhancement of QDSSC's photovoltaic performance.