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In order to build a QE measurement system, I want to confirm the following issues: (1) Is collimated light required for QE characterization of the entire solar cell? How "bad" it could be if having Gaussian beam? (2) It seems LBIC is most common for QE mapping. Is it possible to use monochromatic light instead of laser for QE mapping? I guess the restrictions may include (a) light intensity; (b) wavelength drifting of monochromator in the long mapping duration (Yes or No?) (c) the series resistance of the grid may affect photo-current since photo-generated carriers at different location will travel different distance prior to collection (is this effect negligible?)