Water-Soluble Cationic Copolyacrylamides Modifying NiOx for High-Performance Inverted Perovskite Solar Cells AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01396

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A series of poly(acrylamide-[2-(methacryloyloxy)ethyl]trimethylammonium chloride) (CPAM: PAM, PMD25, and PMD50) with varying quaternary ammonium chloride contents were synthesized and employed as interfacial modification layers between nickel oxide (NiOX) and methylammonium lead iodide (MAPbI3) layers in inverted perovskite solar cells (PVSCs). The incorporation of amide and quaternary ammonium units in CPAM played a crucial role in enhancing the crystallinity of the MAPbI3 layer. Surface modification with CPAM improved interface contact, crystal growth promotion, and passivation of interface and crystal defects. This led to denser packing, larger crystal grain sizes, and higher crystal quality of the MAPbI3 layer, particularly with the PMD25 modifier. The enhanced crystal quality further facilitated the hole mobility within the MAPbI3 layer. Photoluminescence (PL) and time-resolved PL measurements confirmed accelerated charge separation and hole transport from NiOX to the MAPbI3 layer, indicating improved interfacial contact and energy-level alignment at the NiOX/MAPbI3 interface. Consequently, the PVSCs fabricated using CPAM-modified NiOX layers exhibited significantly enhanced short-circuit current (JSC) and photoconversion efficiency (PCE) compared to those of the pristine sample. Among the CPAM variants, PMD25 demonstrated the best photovoltaic (PV) performance, with a PCE of 19.42%, open-circuit voltage of 1.07 V, JSC of 25.44 mA/cm2, and fill factor of 72.1%. The incorporation of CPAM as an interfacial modification layer in the NiOX/MAPbI3 system effectively enhanced the PV performance and the storage stability of inverted PVSCs.