Cu-Ni bimetallic organic frameworks were synthesized by a facile and stepwise solvothermal method, utilizing metal organic framework as precursor. Core-shell CuO@NiO nanospheres were obtained by calcining the bimetallic organic frameworks at 400° C in the air atmosphere. NiO nanospheres were also prepared by calcining the Ni-BTC nanoparticles in the same conditions. Core-shell CuO@NiO and NiO nanoparticles synthesized by this procedure were employed in fabrication of perovskite solar cells (PSCs) as hole transport layer (HTL). In comparison with the performance of the NiO HTL–based PSC, device with core-shell CuO@NiO HTL exhibited a greater photon conversion efficiency 10.11% with a current density of 21.80 mA cm⁻², an open-circuit voltage of 0.91 V, and a fill factor of 0.51, which is about 15% higher than that of the PSC with NiO HTL (8.58%). The excellent performance of PSC based on core-shell CuO@NiO HTL is mainly attributed to the high extraction of charge carrier due to favorable energy level alignment between perovskite and hole transport layer, increase in HTL conductivity, and decrease of defect density in the surface and bulk of HTL. The stability test of devices showed outstanding long-term stability for the inorganic HTL-based PSCs. The devices with NiO and CuO@NiO HTLs maintained more than 52% and 60% of their original efficiency after 1920 h (80 days), respectively. In contrast, the cell with spiro-OMeTAD retained only 31.74% of its initial efficiency under the same storage conditions after 1248 h (52 days).

以金属有机骨架为前驱体，通过分步溶剂热法合成了Cu-Ni双金属有机骨架。核-壳型CuO @ NiO纳米球是通过在大气中于400°C下煅烧双金属有机骨架而获得的。还通过在相同条件下煅烧Ni-BTC纳米颗粒来制备NiO纳米球。通过该程序合成的核-壳CuO @ NiO和NiO纳米粒子被用于钙钛矿太阳能电池（PSC）的制造中，作为空穴传输层（HTL）。与基于NiO HTL的PSC的性能相比，具有核-壳型CuO @ NiO HTL的器件在光密度为21.80 mA cm ^-2时显示出更高的光子转换效率10.11％，开路电压为0.91 V，填充因数为0.51，这比含NiO HTL的PSC的填充因数（8.58％）高约15％。基于核-壳CuO @ NiO HTL的PSC的优异性能主要归因于钙钛矿与空穴传输层之间的良好能级对准，HTL电导率的增加以及表面缺陷密度的降低，电荷载流子的提取率高和大量的HTL。器件的稳定性测试表明，基于无机HTL的PSC具有出色的长期稳定性。具有NiO和CuO @ NiO HTL的设备在1920 h（80天）后分别保持其原始效率的52％和60％以上。相反，在1248小时（52天）之后，在相同的储存条件下，带有spiro-OMeTAD的细胞仅保留了其初始效率的31.74％。