Fig. 3: Reversible regulation of the optical properties via thermal reduction/oxidation. | Nature Communications

Fig. 3: Reversible regulation of the optical properties via thermal reduction/oxidation.

From: Defect-engineered black tetragonal-tungsten-bronze ferroelectric crystal for full spectrum absorption and broadband photoelectronic conversion

Fig. 3

a Schematic representation of the sample preparation process. b Photographic images of the T, R, and B samples. Crystal size: 5 × 5 × 1 mm. c Absorption spectra of the T, R, R2, and B samples. d EPR spectra of the R, B, and R2 samples. e–g XPS results for the R, B, and R2 samples. Detailed peak fitting results are given in Table S3.

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