1：Experimental Design and Method Selection:

The study involved the synthesis and characterization of four conjugated polymers (PBDB-T, PBDB-T(Si), PBDB-T(S), PBDB-T(F)) as HTMs for PbS CQD solar cells. The polymers were designed through side-chain engineering to optimize energy levels, hole mobility, and solid-state ordering.

2：Sample Selection and Data Sources:

PbS CQD inks were prepared using solution-state ligand-exchange methods. The polymers were synthesized according to previous reports and characterized using UV-vis absorption spectroscopy, UPS, and SCLC mobility measurements.

3：List of Experimental Equipment and Materials:

Instruments included UV-vis spectrophotometer, UPS, SCLC setup, AFM, GIWAXS, and KPFM. Materials included PbS CQDs, ZnO nanoparticles, and the synthesized polymers.

4：Experimental Procedures and Operational Workflow:

Devices were fabricated with a planar structure using ITO as the cathode, ZnO as the ETL, PbS i-CQD as the light-harvesting layer, polymer as the HTL, and MoO3/Ag as the anode. Polymer HTLs were spin-coated onto the i-CQD layer.

5：Data Analysis Methods:

Device performance was evaluated through J-V characteristics, EQE measurements, FTPS-EQE, and impedance spectroscopy. Morphology and solid-state ordering were analyzed using AFM and GIWAXS.