Nonradiative and Radiative Recombination in CdS Polycrystalline Structures
Figure 1
(a) Setup of instrumentation for the simultaneous measurements of the MW-PC and PL spectrum resolved transients. UV laser beam is properly attenuated by neutral filters and directed on the sample surface for excitation of MW-PC and PL signals. The MW-PC signal is collected from the excited area by microwave (MW) coaxial needle-tip antenna and registered by the MW detection system. The PL light is collected from a bisector between the incident and reflected UV laser beams and filtered (by UV 100% mirror for excitation wavelength) and focused by quartz lens onto slit of the grating monochromator. The spectrally dispersed PL light transients are registered by photomultiplier. Both signals are simultaneously recorded at different channels of digital 1 GHz band oscilloscope. (b) A sketch of the sample positioning in measurements.
