Ag/Al paste Al:ZnO (AZO) Fourier-transform infrared (FTIR) spectroscopy N-doped Cu2O absorber layer N-type bifacial solar cells PERC X-ray diffraction (XRD) amorphous hydrogenated silicon film atomic force microscopy (AFM) carrier selective contact contact formation crystallinity degradation degree doping process double-diode model excimer laser annealing failure rate fill factor loss analysis metallization numerical electro-optical modeling p+ emitter parasitic resistance passivation rear emitter heterojunction recombination current density scanning electron microscopy (SEM) selective emitter silicon tandem heterojunction solar cell solar cell spectroscopic ellipsometry (SE)