| Full text | |
| Author(s): |
Moral, Raphael F.
[1]
;
Germino, Jose C.
[1]
;
Bonato, Luiz G.
[1]
;
Almeida, Diogo B.
[2]
;
Therezio, Eralci M.
[3]
;
Atvars, Teresa D. Z.
[1]
;
Stranks, Samuel D.
[4, 5]
;
Nome, Rene A.
[1]
;
Nogueira, Ana F.
[1]
Total Authors: 9
|
| Affiliation: | [1] State Univ Campinas UNICAMP, Inst Chem, Cidade Univ Zeferino Vaz, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, Cidade Univ Zeferino Vaz, BR-13083970 Campinas, SP - Brazil
[3] Fed Univ Mato Grosso UFMT, Inst Phys, Quarenta & Nove 2367, BR-78060900 Cuiaba, MG - Brazil
[4] Cavendish Lab, JJ Thomson Ave, Cambridge CB3 OHE - England
[5] Dept Chem Engn & Biotechnol, Philippa Fawcett Dr, Cambridge CB3 0AS - England
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | ADVANCED OPTICAL MATERIALS; v. 8, n. 24 OCT 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
2D metal halide semiconductors have been intensively studied in the past few years due to their unique optical properties and potential for new-generation photonic devices. Despite the large number of recent works, this class of materials is still in need of further understanding due to their complex structural and optical characteristics. In this work, a molecular-level explanation for the dual band emission in the 2D (C4H9NH3)(2)PbI4 in its bulk form is presented, demonstrating that this feature is caused by a strong exciton-phonon coupling. Temperature-dependent photoluminescence with Raman and IR spectroscopies reveals that vibrations involving the C-NH3+ butylammonium polar head are responsible for this exciton-phonon coupling. Additionally, experimental shifts in the mean phonon frequencies coupled with the electronic excitation, combined with a theoretical model, show that these vibrational modes present a soft-mode behavior in the phase transition of this material. (AU) | |
| FAPESP's process: | 19/25765-6 - In situ experiments with synchrotron based SAXS and WAXS to probe reactions and formation mechanisms of trending (nanostructured) lead halide materials |
| Grantee: | Raphael Fernando Moral |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 13/16245-2 - Photophysical properties of thin films of conjugated polymers |
| Grantee: | Teresa Dib Zambon Atvars |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 19/22576-8 - Accessing the excited state dynamics in nanostructures by multidimensional coherent spectroscopy |
| Grantee: | Diogo Burigo Almeida |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |