Fig. 5: CL and PL analysis.
From: Unveiling microscopic carrier loss mechanisms in 12% efficient Cu2ZnSnSe4 solar cells
a, Hyperspectral and intensity-combined CL map acquired at 10 keV from an FIB-prepared cross-sectional sample of CZTSe absorber. The SEM image is shown in Supplementary Fig. 18. The white arrows labelled with grain boundary numbers are where CL profiles are extracted for further analysis.The horizontal and vertical blue dash arrows indicate where line scans are taken. b, Spectro-, spatial- and intensity-resolved CL maps of the two representative grain boundaries indicated in a. c, Extracted CL intensity and peak energy profiles across the two grain boundaries. d, ln[ΔI] plots of the CL intensity profiles of GB1 and GB2 for positive distance values. The red and blue solid lines are linear regressions. The ln[ΔI] plots of GB3–6 are shown in Supplementary Fig. 19. e, Extracted CL peak energy profiles along the horizontal and vertical blue dashed arrows indicated in a. f, TRPL measured with a 532 nm laser and its corresponding double exponential decay fit. The unit cps. means count per second.
