Layered lead halide perovskites have attracted much attention as a promising material for a new generation of optoelectronic devices. To make progress in applications, a full understanding of their basic properties is essential. Here, we study 2D layered (BA)2PbX4 by using different halide anions (X = I, Br, and Cl) along with quantum confinement. The obtained cell parameters evolution, supported by experimental and theoretical calculations, indicates strong lattice distortions of the metal halide octahedra breaking the local inversion symmetry in (BA)2PbCl4 which strongly correlates with a pronounced Rashba spin-splitting effect. Optical measurements reveal strong photoluminescence quenching and a drastic reduction in the PL quantum yield in this larger band gap compound. We suggest that these optical results are closely related to the appearance of the Rashba effect due to the existence of a local electric dipole. The results obtained in ab initio calculations showed that the (BA)2PbCl4 possesses electrical polarization of 0.13 ?C/cm2 and spin-splitting energy of about 40 meV. Our work establishes that local octahedra distortions induced Rashba spin splitting explains why obtaining UV-emitting materials with high PLQY is a big challenge.
Bem-vindo(a) aos Anais do VII NanoMat, evento organizado pela Pós-graduação em Nanociências e Materiais Avançados da Universidade Federal do ABC (UFABC) com o intuito de reunir e debater trabalhos desenvolvidos por alunos e pós-doutorandos em Materiais e áreas afins.
Comissão Organizadora
Pedro Alves da Silva Autreto
Andre Luiz Martins de Freitas
Aryane Tofanello
Comissão Científica
Ferramenta completa de submissão, avaliação e publicação de anais para eventos científicos.
