Tailoring Precursor Chemistry Enabled Room Temperature-Processed Perovskite Films in Ambient Air for Efficient and Stable Solar Cells with Improved Reproducibility

作者：Fang, Yuxuan; Tian, Tian; Yang, Meifang; Tan, Ying; Zhong, Jun-Xing; Huang, Yuhua; Wang, Xudong; Tao, Junlei; Yang, Shaopeng^*; Zou, Can; Yang, Shuang; Peng, Yong; Xue, Qifan^*; Wu, Wu-Qiang^*

来源：Advanced Functional Materials, 2023, 33(38).

DOI：10.1002/adfm.202303674

• annealing-free
• blade-coating
• perovskite solar cells
• precursor chemistry
• solvent engineering

The perovskite solar cells (PSCs) are promising for commercialization and practical application. However, high-quality perovskite films are normally fabricated in inert gas-filled glovebox, followed by thermal annealing, which is energy-consuming and thus not cost-effective. In this study, a simple manufacturing strategy is demonstrated to fabricate the highly-crystalline perovskite films in ambient air (a relative humidity of over approximate to 50%) at room temperature via blade-coating without the subsequent thermal-annealing. The perovskite precursor chemistry is tailored by solvent engineering via employing 2-methoxyethanol, which can strongly coordinate with ammonium halide species, thus forming highly uniform small-sized colloids and facilitating the homogeneous nucleation and rapid crystallization of perovskite films even at room temperature. The resultant PSCs fabricated with ambient-processed, annealing-free MAPbI(3) perovskite films exhibit a champion efficiency up to 19.16% with negligible hysteresis and improved reproducibility, which is on par with the high-temperature annealed counterparts fabricated in N-2, and represented one of the highest reported efficiencies for the room-temperature processed PSCs in ambient air. The unencapsulated devices show extended lifespan over 1000 h with nearly no efficiency loss.

• 单位
  武汉理工大学; 中山大学; 华东理工大学