Crystal Growth Regulation of Ruddlesden-Popper Perovskites via Self-Assembly of Semiconductor Spacers for Efficient Solar Cells

作者：Chen, Mingqian; Dong, Xiyue; Xin, Yufei; Gao, Yuping; Fu, Qiang; Wang, Rui; Xu, Zhiyuan; Chen, Yu^*; Liu, Yongsheng^*

来源：Angewandte Chemie - International Edition, 2023.

DOI：10.1002/anie.202315943

• 2D Perovskite
• Morphology
• Organic Semiconductor Spacer
• Quadrupole-Quadrupole Interactions
• Solar Cells

The crystal growth and orientation of two-dimensional (2D) perovskite films significantly impact solar cell performance. Here, we incorporated robust quadrupole-quadrupole interactions to govern the crystal growth of 2D Ruddlesden-Popper (RP) perovskites. This was achieved through the development of two unique semiconductor spacers, namely PTMA and 5FPTMA, with different dipole moments. The ((5FPTMA)0.1(PTMA)0.9)2MAn-1PbnI3n+1 (nominal n=5, 5F/PTMA-Pb) film shows a preferred vertical orientation, reduced grain boundaries, and released residual strain compared to (PTMA)2MAn-1PbnI3n+1 (nominal n=5, PTMA-Pb), resulting in a decreased exciton binding energy and reduced electron-phonon coupling coefficients. In contrast to PTMA-Pb device with an efficiency of 15.66 %, the 5F/PTMA-Pb device achieved a champion efficiency of 18.56 %, making it among the best efficiency for 2D RP perovskite solar cells employing an MA-based semiconductor spacer. This work offers significant insights into comprehending the crystal growth process of 2D RP perovskite films through the utilization of quadrupole-quadrupole interactions between semiconductor spacers. @@@ We incorporated robust quadrupole-quadrupole interactions to regulate the crystal growth of 2D Ruddlesden-Popper (RP) perovskites. This was achieved through the development of two unique semiconductor spacers, namely PTMA and 5FPTMA, with different dipole moments. Devices utilizing films incorporating these interactions exhibited a significant efficiency enhancement, increasing from 15.66 % to 18.56 %.+image

• 单位
  中国科学院; y; 南开大学