a method for fabricating a cell structure includes doping a substrate to form a n - region and a p - region , disposing a first anti - reflective layer on the substrate , disposing a metallic contact paste on the first anti - reflective layer , drying the metallic contact paste to form contacts , disposing a second anti - reflective layer on the first anti - reflective layer and the metallic contacts , and heating the cell structure , wherein heating the cell structure results in metallic contact material penetrating the first anti - reflective layer and contacting the substrate .