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a) Illustration of device structure labeled with different components. b) Light harvesting efficiency (LHE) of CH3NH3PbI3−xBrx absorber (with different Br content) deposited on the same thickness of compact‐NiO/meso‐Al2O3 layer and UV–visible spectroscopy in ethanol for Au@SiO2 NRs with AR of 3.8. The LHE of CH3NH3PbI3−xBrx coated compact‐NiO/meso‐Al2O3 layer with Au@SiO2 NRs is also presented.
