Multi-environment phase stabilization by lattice reinforcement for efficient perovskite solar cells [通过晶格加固实现多环境下相稳定的高效钙钛矿太 阳电池]

作者：Xing Z.; Meng X.; Li D.; Li Z.; Gong C.; Hu X.; Hu T.; Chen Y.

来源：Science China-Materials, 2023.

DOI：10.1007/s40843-022-2400-9

• lattice distortion
• perovskite solar cells
• phase transition
• residual stress
• upscaling fabrication

Formamidine (FA)-rich perovskite solar cells (PSCs) display high competitiveness for commercial applications due to their excellent thermal stability and wide spectral absorption. However, an undesired phase transition is induced in FA-rich PSCs through an excessively distorted crystal lattice, which is considerably controlled by residual stress. In this work, by constructing a series of lattice-reinforced structures, the differential interaction between the organic spacer cations and inorganic octahedra is verified. Furthermore, by exploring the transition processes of α-phase to -β-phase and δ-phase, the importance of the relationship between the residual stress release and lattice reinforcement is revealed. Finally, the phenmethylammonium-treated device exhibits an outstanding photoelectric conversion efficiency (PCE) of 22.90% with a suppressed multipath phase transition, and can maintain 90% of its initial performance after being placed in the air for 1000 h. Additionally, a PCE of 17.10% is achieved on a mini-module with a 25-cm2 substrate, verifying its feasible upscaling fabrication. [Figure not available: see fulltext.].

• 单位
  北京大学