This PDF file includes:

• fig. S1. The SEM images of the as-grown perovskite single-crystal film.
• fig. S2. Optical microscopy image and AFM image of the perovskite single-crystal film.
• fig. S3. Synchrotron-radiated single-crystal XRD analysis.
• fig. S4. EDS mappings of the perovskite single-crystal films.
• fig. S5. Powder XRD patterns of the perovskite single-crystal films.
• fig. S6. Optical microscopy images of the seed crystal regions.
• fig. S7. Scalable fabrication of perovskite single-crystal films.
• fig. S8. Perovskite single-crystal film growth process.
• fig. S9. The height profiles of perovskite single-crystal films with different thicknesses.
• fig. S10. Responsivity as a function of incident light intensity.

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