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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)...
The conjugated organic semiconductor spacers have drawn wide attention in two‐dimensional (2D) perovskites and formamidinium (FA) has been widely used as A‐site cation in high‐performance 3D perovskite solar cells (PSCs). However, the FA‐based semiconductor spacers have rarely been investigated in 2D Ruddlesden‐Popper (RP) perovskites. Here, we developed two FA‐based spacers containing thieno[3,2‐b]thiophene...
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