Novel Stannite-type Complex Sulfide Photocatalysts A<sup>I</sup><sub>2</sub>-Zn-A<sup>IV</sup>-S<sub>4</sub> (A<sup>I</sup> = Cu and Ag; A<sup>IV</sup> = Sn and Ge) for Hydrogen Evolution under Visible-Light Irradiation
Distribution of the number of citations over years.