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Measured SE spectra of the HP1, HP2, and HP3 perovskite materials. (a) Integrated SE spectra of HP1 and HP2, (b) integrated SE spectra of HP1, HP2, and HP3, (c) predicted contrast plots [calculated from the data in 2b using the SE contrast equation (see Materials and Methods)], and (d) differentiated SE spectra of HP1, HP2, and HP3.
