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Abstract：
Nickel oxide (NiOx)-based inverted perovskite solar cells stand as promising candidates for advancing perovskite photovoltaics towards commercialization, leveraging their remarkable stability, scalability, and cost-effectiveness. However, the interfacial redox reaction between high-valence Ni4+ and perovskite, alongside the facile conversion of iodide in perovskite into I2, significantly deteriorates the performance and reproducibility of NiOx-based perovskite photovoltaics. Here, potassium borohydride (KBH4) is introduced as a dual-action reductant, which effectively avoids the Ni4+/perovskite interface reaction and mitigates the iodide-to-I2 oxidation within perovskite film. This synergistic redox modulation significantly suppresses nonradiative recombination and increases the carrier lifetime. As a result, an impressive power conversion efficiency of 24.17% for NiOx-based perovskite solar cells is achieved, and a record efficiency of 20.2% for NiOx-based perovskite solar modules fabricated under ambient conditions. Notably, when evaluated using the ISOS-L-2 standard protocol, the module retains 94% of its initial efficiency after 2000 h of continuous illumination under maximum power point at 65 °C in ambient air.
摘要：
基于氧化镍（NiOx）的倒置钙钛矿太阳能电池是将钙钛矿光伏技术推向商业化的有希望的候选人，利用他们非凡的稳定性，可扩展性，和成本效益。然而,高价Ni4+与钙钛矿的界面氧化还原反应,除了钙钛矿中碘化物容易转化为I2之外，显著降低了NiOx基钙钛矿光伏的性能和重现性。这里,引入硼氢化钾（KBH4）作为双作用还原剂，这有效地避免了Ni4/钙钛矿界面反应，并减轻了钙钛矿薄膜中碘化物向I2的氧化。这种协同氧化还原调制显着抑制非辐射复合并增加载流子寿命。因此,NiOx基钙钛矿太阳能电池的功率转换效率达到了24.17%，在环境条件下制造的基于NiOx的钙钛矿太阳能模块的创纪录效率为20.2%。值得注意的是,当使用ISOS-L-2标准协议进行评估时，在环境空气中65°C的最大功率点下,在2000小时的连续照明之后,模块保持其初始效率的94%。
