Figure 3. XPS spectra of BS, ZIS and BZIS-1/20: (A) Zn 2p, (B) In 3d, (C) Bi 4f and (D) S 2p. XPS: X-ray photoelectron spectroscopy; BS: Bi2S3; ZIS: ZnIn2S4; BZIS: Bi2S3/ZnIn2S4.
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