Interfacial engineering has been considered one of the most effective methods for further enhancing the performance of perovskite solar cells. Herein a facile but effective interfacial engineering method of modifying NiO x coated substrate by PTAA is demonstrated for inverted planar perovskite solar cells. The surface modification by polymeric PTAA could effectively tailor the quality of perovskite absorber layer with larger grain size and better crystallinity by controlling wettability of NiO x surface with varied thickness of hydrophobic PTAA. The improvement of J sc was ascribed to the improved perovskite film quality with reduced trap state densities. By EIS and TRPL analysis, it was also confirmed that PTAA modification significantly facilitated interfacial charge transfer at the interface between perovskite and PTAA/NiO x due to the gradient band alignment. As a consequence, the highest power conversion efficiency of 17.1% together with negligible hysteresis effect was achieved from planar perovskite solar cells with 0.5 mg/mL optimal concentration of PTAA.
The scalability of perovskite solar cells (PSCs) is another major challenge for PSCs besides high efficiency and stability. The grooved roller coating (GRC) method here enables the scalable and continuous production of PSCs with high utilization ratio of materials.
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