2.2 Characterization
External quantum efficiency (EQE) of the SCH solar cells was tested with a quantum efficiency test system (SCS600-XT). Contact resistivity (ρc) of the devices was obtained using Keithley 2400 source meter. Light J-V characteristics of the large-area solar cells were calibrated by solar cell sorting machine (DG100) under AM1.5 (100 mW/cm2, 25 °C) illumination.