| abstract |
Methods are described for forming CZTS absorber layers in TFPV devices with graded compositions and graded bandgaps. Methods are described for utilizing at least one of Zn, Ge, or Ag to alter the bandgap within the absorber layer. Methods are described for utilizing Te, S, Se, O, Cd, Hg, or Sn to alter the bandgap within the absorber layer. Methods are described for utilizing either a 2-step process or a 4-step process to alter the bandgap within the absorber layer. |