File Name : figs1.tif

Caption : wdx line scans averaged to proof the homogeneity of different czgse grains in a specific sample. 

File Name : figs2.tif

Caption : refined xrd pattern of an off-stoichiometric g-f-type czgse sample containing znse as secondary phase.

File Name : figs3.tif

Caption : unit cell volumes of off-stoichiometric czgse powder samples versus cu/(zn+ge). 

File Name : figs4.tif

Caption : refined neutron diffraction pattern of an off-stoichiometric, single-phase f-i-type czgse sample.

File Name : figs5.tif

Caption : total point defect concentration in dependence of the cation ratios.

File Name : figs6.tif

Caption : evolution of the stoichiometric coefficients of cu, zn, and ge with changing cu/(zn+ge).

File Name : figs7.tif

Caption : tauc plot of the diffuse reflectance data to deduce bandgap energies of czgse with different compositions.