1：Experimental Design and Method Selection:

The IPC method was developed to grow large-area flexible single-crystalline membranes of (PEA)2PbI4. The method involves controlled temperature and solubility conditions to induce crystallization from the edges inward.

2：The method involves controlled temperature and solubility conditions to induce crystallization from the edges inward. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: Precursor solutions of PbI2 and PEAI in GBL were used. The growth process was monitored at various stages to ensure quality.

3：List of Experimental Equipment and Materials:

Glass slides, PET substrates, GBL solvent, PbI2, PEAI, and various characterization tools like XRD, SEM, TEM, AFM, and PL spectroscopy.

4：Experimental Procedures and Operational Workflow:

The precursor solution was pipetted onto preheated substrates, covered with a second slide, and subjected to controlled temperature reduction to grow the SCM.

5：Data Analysis Methods:

XRD, GIWAXS, and TEM for structural characterization; UV-Vis, PL, and UPS for optical properties; SCLC for trap-state density; and electrical measurements for device performance.