Abstract
TiO2 nanorod arrays (NAs) were synthesized with different morphology based on ethanol addition in the TiO2 precursors for efficient hole-conductor-free perovskite solar cells (PSCs). The morphology and optical properties of samples based on TiO2 NAs prepared with a different amount of ethanol added in TiO2 precursors were analyzed. The results indicated that ethanol addition in TiO2 precursors help regulate the morphology of TiO2 NAs and improve the photovoltaic performance of the PSCs based on TiO2 NAs. Finally, the carbon-based PSCs with 96[Formula: see text]nm TiO2 NAs in diameter by 1[Formula: see text]mL of ethanol addition achieved the optimal performance with a power conversion efficiency (PCE) of 11.86%. The results can offer inspiration for performance improvement of PSCs based on TiO2 NAs.
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