The synthesis and characterization of low‐temperature solution‐processable monodispersed nickel cobaltite (NiCo₂O₄) nanoparticles (NPs) via a combustion synthesis is reported using tartaric acid as fuel and the performance as a hole transport layer (HTL) for perovskite solar cells (PVSCs) is demonstrated. NiCo₂O₄ is a p‐type semiconductor consisting of environmentally friendly, abundant elements and higher conductivity compared to NiO. It is shown that the combustion synthesis of spinel NiCo₂O₄ using tartaric acid as fuel can be used to control the NPs size and provide smooth, compact, and homogeneous functional HTLs processed by blade coating. Study of PVSCs with different NiCo₂O₄ thickness as HTL reveals a difference on hole extraction efficiency, and for 15 nm, optimized thickness enhanced hole carrier collection is achieved. As a result, p‐i‐n structure of PVSCs with 15 nm NiCo₂O₄ HTLs shows reliable performance and power conversion efficiency values in the range of 15.5% with negligible hysteresis.

中文翻译：

---

钙钛矿型光伏尖晶石NiCo2O4空穴传输层的低温燃烧合成

据报道，使用酒石酸作为燃料，通过钙钛矿型太阳能电池的燃烧合成方法，可以对低温固溶单分散镍钴（NiCo ₂ O ₄）纳米颗粒（NPs）进行合成和表征。（PVSC）被演示。NiCo ₂ O ₄是p型半导体，与NiO相比，由环保，丰富的元素和更高的电导率组成。结果表明，以酒石酸为燃料的尖晶石NiCo ₂ O ₄的燃烧合成可用于控制NPs的尺寸，并提供通过叶片涂覆加工的光滑，致密且均质的功能性HTL。不同NiCo的PVSC的研究HTL的₂ O ₄厚度揭示了空穴提取效率的差异，并且对于15 nm，可以实现优化的厚度增强的空穴载流子收集。结果，具有15 nm NiCo ₂ O ₄ HTL的PVSC的p-i-n结构显示了可靠的性能，并且功率转换效率值在15.5％的范围内，而磁滞可以忽略不计。