Publication date: 8th July 2026
Quasi-two-dimensional (quasi-2D) CsPbBr3 perovskite nanoplatelets are emerging as compelling platforms for efficient blue light emitting devices owing to their dimensional quantum confinement control.[1-3] Here, we report a facile solution-based synthesis of thiophenethylammonium ligand passivated CsPbBr3 nanoplatelets (NPLs) at ambient atmosphere. A systematic study has been performed on how the precursor composition governs the thickness, platelet orientation, and single PL-emission centred at 464 nm with a small stoke shift. The obtained data resembles with the quasi-2D Ruddlesden-Popper phase mixed cation lead bromide perovskite with n=3 phase.[4, 5] The morphological analysis showed long-range platelet stacking exclusively for the thiophenethylammonium ligand, which was further examined by the control reactions performed using phenethylammonium and 4-fluorophenethylammonium ligands. Furthermore, the use of control ligands experienced mixed emission peaks which collectively elucidate the interplay between the nanoplatelet orientation and optoelectronic performance in quasi-2D perovskites. Finally, we performed photodetector application by simply drop-casting the material on top of Si/SiO2 substrate to demonstrate the proof-of-the-concept relevance of these materials highlighting their potential for optoelectronic applications.
S.G. and S.D.A. acknowledge the National Science Centre (grant SONATA 20, no. 2024/55/D/ST5/02865) for financial support.
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