Fabrication of opaque aluminum electrode-based perovskite solar cells enabled by the interface optimization

作者：Sun, Xue; Lin, Tong; Ding, Changzeng; Guo, Shuxuan; Ismail, Irfan; Wang, Zhenguo; Wei, Junfeng; Luo, Qun; Lin, Jian; Zhang, Dongyu^*; Ma, Chang-Qi^*

来源：Organic Electronics: physics, materials, applications , 2022, 104: 106475.

DOI：10.1016/j.orgel.2022.106475

• Perovskite solar cell
• Aluminum bottom electrode
• Silver nanowire
• Interface optimization
• Solution process

In the total cost of perovskite solar cells (PVSK), the most successfully used indium-tin-oxide (ITO) transparent electrode takes up a substantial amount, which could be big limit for the commercialization of PVSK cells. Aluminum (Al) foil is an extremely low-cost metal electrode with high conductivity and is an ideal alternative for the ITO electrode in PVSKs. Aiming to develop low-cost PVSK, we systematically optimized the layer sequential of inverted PVSK based on the opaque Al bottom electrode. The unsuitable work functions of Al electrode and the poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine (PTAA) hole transport layer lead to low device performance. Through the introduction of a thin molybdenum (VI) oxide (MoO3) layer between the Al electrode and PTAA layer, the hole injection barrier was minimized, leading to a dramatic improvement of device performance. By adjusting the thicknesses of the MoO3 interlayer, a champion cell showed a power conversion efficiency of 7.09% based on spray-coated silver nanowires top electrode, proving the concept of using aluminum foil in making lowcost perovskite solar cells.

• 单位
  中国科学院