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• W4312508413 abstract "As a low-cost, high stable hole transport material, nickel oxide has been widely used in inverted structure perovskite solar cells in recent years. By far, the most common method of preparing nickel oxide hole transport layers is spin-coating pre-prepared nickel oxide nanoparticles (NiO_<i>x</i> NPs), which puts forward high requirement for the particle sizes and solution processing capabilities of NiO_<i>x</i> NPs. In this work, the sizes of NiO_<i>x</i> NPs are precisely controlled by adjusting the pH value of the system in the synthesis process, and high-quality nickel oxide hole transport layers are then prepared. The experimental results exhibit that the NiO<i>x</i> NPs with sizes of 5–10 nm are obtained at a pH value in a range of 9.5–9.8. More interestingly, the obtained NiO_<i>x</i> NPs have good dispersion stability and can achieve long-term dispersion in aqueous solution. Furthermore, the structural composition analysis of NiO_<i>x</i> NPs shows that the pH value of the synthesis system does not have a significant effect on the material structure nor composition of the NiO_<i>x</i> NP. Surface morphological analysis shows that the NiO_<i>x</i> film prepared by the pH-controlled NiO_<i>x</i> NPs is rather dense and particularly flat with small surface roughness. It is also found that the film exhibits good hole extraction capability. We also fabricate an inverted perovskite solar cell based on the NiO_<i>x</i> film. The device structure is ITO/NiO_<i>x</i>/CH₃NH₃PbI₃/PC61BM/Bphen/Ag. It yields a good photovoltaic conversion efficiency (17.39%). In addition, the device is almost hysteresis-free. Our experimental results exhibit that the performance of perovskite solar cells can be effectively improved by precisely controlling the sizes of NiO_<i>x</i> NPs through pH values. Our work is expected to facilitate the development of NiO_<i>x</i>-based perovskite solar cells." @default.
• W4312508413 created "2023-01-05" @default.
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• W4312508413 date "2022-01-01" @default.
• W4312508413 modified "2023-09-27" @default.
• W4312508413 title "Performance of trans perovskite solar cells improved by finely adjusting the particle size of nickel oxide nanoparticles through pH value" @default.
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• W4312508413 doi "https://doi.org/10.7498/aps.71.20221640" @default.
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