Chang Chih-Yu, Wu You-Wei, Yang Sheng-Hsiung, Abdulhalim Ibrahim
Institute of Lighting and Energy Photonics, College of Photonics, National Yang Ming Chiao Tung University, No. 301, Section 2, Gaofa 3rd Road, Guiren District, Tainan 71150, Taiwan.
Department of Electro-Optics and Photonics Engineering and the Ilse Katz Institute for Nanoscale Science and Technology, School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.
Nanomaterials (Basel). 2022 Sep 25;12(19):3336. doi: 10.3390/nano12193336.
Hole transport layers (HTLs) with high conductivity, charge extraction ability, and carrier transport capability are highly important for fabricating perovskite solar cells (PSCs) with high power conversion efficiency and device stability. Low interfacial recombination between the HTL and perovskite absorber is also crucial to the device performance of PSCs. In this work, we developed a three-stage method to prepare NiO nanoflakes as the HTL in the inverted PSCs. Due to the addition of the nanoflake layer, the deposited perovskite films with larger grain sizes and fewer boundaries were obtained, implying higher photogenerated current and fill factors in our PSCs. Meanwhile, the downshifted valence band of the NiO HTL improved hole extraction from the perovskite absorber and open-circuit voltages of PSCs. The optimized device based on the NiO nanoflakes showed the highest efficiency of 14.21% and a small hysteresis, which outperformed the NiO thin film as the HTL. Furthermore, the device maintained 83% of its initial efficiency after 60 days of storage. Our results suggest that NiO nanoflakes provide great potential for constructing PSCs with high efficiency and long-term stability.
具有高导电性、电荷提取能力和载流子传输能力的空穴传输层（HTLs）对于制造具有高功率转换效率和器件稳定性的钙钛矿太阳能电池（PSCs）至关重要。HTL与钙钛矿吸收层之间的低界面复合对于PSCs的器件性能也至关重要。在这项工作中，我们开发了一种三步法来制备NiO纳米片作为倒置PSCs中的HTL。由于添加了纳米片层，获得了具有更大晶粒尺寸和更少边界的沉积钙钛矿薄膜，这意味着我们的PSCs中具有更高的光生电流和填充因子。同时，NiO HTL的价带下移改善了从钙钛矿吸收层的空穴提取以及PSCs的开路电压。基于NiO纳米片的优化器件显示出最高效率为14.21%且滞后较小，其性能优于作为HTL的NiO薄膜。此外，该器件在储存60天后仍保持其初始效率的83%。我们的结果表明，NiO纳米片为构建具有高效率和长期稳定性的PSCs提供了巨大潜力。
