Luminescence and magnetic properties of copper-deficient Cu2−x+Cux/22+□x/2ZnSnS4 (0 < x ≤ 0.30) solid solutions with a kesterite structure

The copper-deficient solid solutions Cu2–yZnSnS4 (0  of C u 2 − x + C u x/2 2+ □ x/2 Z n S n S 4 (0  C u 2 − x + C u x/2 2+ □ x/2 Z n S n S 4 solid solutions at 78 K is due to the Cu2+・VCu associates of defects. .