Enhanced stability and linearly polarized emission from CsPbI₃ perovskite nanoplatelets through A-site cation engineering.

ABSTRACT: The anisotropy of perovskite nanoplatelets (PeNPLs) opens up many opportunities in optoelectronics, including enabling the emission of linearly polarized light. But the limited stability of PeNPLs is a pressing challenge, especially for red-emitting CsPbI₃. Herein, we address this limitation by alloying formamidinium (FA) into the perovskite cuboctahedral site. Unlike Cs/FA alloying in bulk thin films or nanocubes, FA incorporation in nanoplatelets requires meticulous control over the reaction conditions, given that nanoplatelets are obtained in kinetically-driven growth regimes instead of thermodynamically-driven conditions. Through in-situ photoluminescence (PL) measurements, we find that excess FA leads to uncontrolled growth, where phase impurities and nanoplatelets of multi

SUBMITTER: Jeong WH 

PROVIDER: S-EPMC12757592 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature