Abstract
We report the synthesis and application of NiO nanoparticles (NPs) for improving the performance of hole-transport-free carbon-based perovskite solar cells (PSCs). The NiO NPs were prepared by sol-gel method and mixed with commercial and synthesized carbon paste to form NiO-modified carbon electrodes. The effects of calcination temperature and NiO NP concentration on the electrical conductivity and electrochemical properties of the carbon electrodes were investigated. The NiO NP doping enhanced the hole extraction and reduced the charge recombination at the perovskite–carbon interface, leading to increased current and voltage in the PSCs. The best power conversion efficiency of 8.6% was obtained by incorporating NiO NP-doped synthesized carbon paste as the cathode, which was significantly higher than that of the PSCs without NiO NP doping. This research provides a simple and effective strategy to improve the performance of hole-transport-free carbon-based PSCs by using NiO NPs as an additive in the carbon electrodes.
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