1：Experimental Design and Method Selection:

The study involves the synthesis of DPC60 and its application as an interfacial layer in PSCs. The methodology includes the synthesis of DPC60, device fabrication, and characterization techniques such as X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and photoluminescence (PL) experiments.

2：Sample Selection and Data Sources:

The samples include PSCs with and without the DPC60 interfacial layer. Data sources include experimental measurements of device performance and stability.

3：List of Experimental Equipment and Materials:

Equipment includes a Bruker Esquire HCT mass spectrometer, Bruker SMART APEX CCD system, Cary 5000 UV/Vis-NIR spectrophotometer, CH Instrument Potentiostat, Keithley 2420 source measure unit, ABET M-SLSS solar simulator, Hitachi S-8000 scanning electron microscope, Bruker X-ray diffraction instruments, Thermo Scientific Esacalab250 XPS system, KLA Tencor profilometer, Ramé-Hart model 250 goniometer, and a Multimode 8 SPM system (Bruker). Materials include C60, benzylamine, benzaldehyde, chlorobenzene, ITO-coated glass substrates, SnO2 nanoparticle solution, perovskite precursor solution, Spiro-OMeTAD, and Au.

4：Experimental Procedures and Operational Workflow:

The experimental procedures include the synthesis of DPC60, fabrication of PSCs with and without the DPC60 interfacial layer, and characterization of the devices.

5：Data Analysis Methods:

Data analysis includes the evaluation of device performance and stability, as well as the analysis of characterization data to understand the effects of the DPC60 interfacial layer.