Figure 2. AI-TA analysis of photoinduced halide substitution in perovskite nanocrystals (IMAGE)

Institute for Basic Science

Figure 2. AI-TA analysis of photoinduced halide substitution in perovskite nanocrystals

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Using the AI-TA technique, the Optical Frequency Comb team acquired time-resolved transient absorption spectra of CsPb (Br/Cl)₃ nanocrystals dispersed in chloroform (top left). By analyzing the data sequentially over the measurement period, the researchers detected a progressive shortening of hot carrier lifetimes and evidence of higher trap density (top right), along with a gradual blueshift in the bandgap energy (bottom left). These trends reflect a light-induced halide exchange process, where bromide-rich nanocrystals gradually convert into chloride-rich compositions during the experiment (bottom right).

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