CZTS A preparation method of solar cell using ZnS buffer layer

摘要

The present invention relates to a preparation method of CZTS-based thin film solar cell having a rear electrode to which a zinc sulfide buffer layer is applied, and more specifically, to a thin film solar cell having improved light conversion efficiency and battery characteristics through interfacial control between the rear electrode and a light absorbing layer by introducing a zinc sulfide buffer layer to between the rear electrode and a metal precursor layer to form the light absorbing layer, and to a preparation method thereof. The preparation method of a thin film solar cell according to the present invention is capable of reducing pores (void) generated on an interface by forming a zinc sulfide buffer layer between the rear electrode and the metal precursor layer so as to have a more uniform and dense thin film. Also, it is possible to suppress that constituent elements (Cu, Zn, Sn) and VI group elements (Se, S) of a metal precursor of the light absorbing layer are diffused toward a molybdenum rear electrode, thereby improving electrical junction of the light absorbing layer and the rear electrode to have excellent light conversion efficiency.