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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 dominant hole transport material (HTM) in state‐of‐the‐art perovskite solar cells (PSCs) is Spiro‐OMeTAD, which needs to be doped using hydrophilic dopants to improve its hole mobility and conductivity, resulting in inferior device stability. Here, we propose an effective molecular design strategy to construct dopant‐free polymer HTMs by selecting four structurally related polymers and investigating...
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