| Full text | |
| Author(s): Show less - |
Terres, Sophia
;
Scalon, Lucas
;
Brunner, Julius
;
Horneber, Dominik
;
Duereth, Johannes
;
Huang, Shiyu
;
Taniguchi, Takashi
;
Watanabe, Kenji
;
Nogueira, Ana Flavia
;
Hoefling, Sven
;
Klembt, Sebastian
;
Vaynzof, Yana
;
Chernikov, Alexey
Total Authors: 13
|
| Document type: | Journal article |
| Source: | ADVANCED OPTICAL MATERIALS; v. 13, n. 11, p. 9-pg., 2025-03-28. |
| Abstract | |
Two-dimensional (2D) organic-inorganic hybrid perovskites emerged as a versatile platform for light-emitting and photovoltaic applications due to their unique structural design and chemical flexibility. Their properties depend heavily on the choice of the inorganic lead halide framework and the surrounding organic layers. Recently, the introduction of chiral cations into 2D perovskites has attracted major interest to induce chirality and tune the chiro-optical response. Importantly, their optical properties are dominated by tightly bound excitons that also serve as primary carriers for energy transport. The mobility of photo-injected excitons is thus important from the perspectives of fundamental material properties and optoelectronic applications, yet remains an open question. Here, exciton propagation in 2D chiral perovskites is demonstrated using transient photoluminescence microscopy and density-dependent transport over more than 100 nanometers at room temperature is revealed with diffusion coefficients as high as 2 cm(2) s(-1). Two distinct regimes of initially rapid propagation and subsequent localization are observed. Moreover, perovskites with enantiomer pure cations exhibit faster exciton diffusion than the racemic mixture, correlated with the impact of the material composition on the disorder. Altogether, the observations of efficient exciton diffusion highlight the potential of 2D chiral perovskites to merge chiro-optical properties with strong light-matter interaction and energy transport. (AU) | |
| FAPESP's process: | 21/12104-1 - Unveiling the role of chiral organic spacers on the structural, photophysical, and electronic properties of 2D and 2D/3D perovskite structures |
| Grantee: | Lucas Scalon |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate (Direct) |
| FAPESP's process: | 17/11631-2 - CINE: computational materials design based on atomistic simulations, meso-scale, multi-physics, and artificial intelligence for energy applications |
| Grantee: | Juarez Lopes Ferreira da Silva |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 18/21401-7 - Multi-User Equipment approved in grant 2017/11631-2: cluster computational de alto desempenho - ENIAC |
| Grantee: | Juarez Lopes Ferreira da Silva |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 20/04406-5 - Perovskite solar cells from easy, cheap and green sources: a synergistic approach for the synthesis of new organic hole transport materials and the use of more environmental-friendly solvents |
| Grantee: | Lucas Scalon |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |