Structure, optoelectronic properties and thermal stability of the triple organic cation GAx FAx MA1-2 x PbI3system prepared by mechanochemical synthesis
| dc.contributor.author | Minussi, F. B. [UNESP] | |
| dc.contributor.author | A. Silva, L. | |
| dc.contributor.author | Araújo, E. B. [UNESP] | |
| dc.contributor.institution | Universidade Estadual Paulista (UNESP) | |
| dc.contributor.institution | University of Rio Verde | |
| dc.date.accessioned | 2022-04-28T19:51:13Z | |
| dc.date.available | 2022-04-28T19:51:13Z | |
| dc.date.issued | 2022-02-28 | |
| dc.description.abstract | Halide perovskites are a well-known class of materials with many interesting applications. Great attention has been devoted to investigating halide perovskites containing triple methylammonium (MA+), formamidinium (FA+), and guanidinium (GA+) cations. Despite presenting very good applied perspectives so far, the lack of fundamental information for this system, such as its structural, thermal, and optoelectronic characteristics, prompts a step back before any technological leap forward. In the present work, we investigate the physical properties of mechanochemically solvent-free synthesized GAxFAxMA1-2xPbI3 halide perovskite powders with compositions of 0.00 ≤ x ≤ 0.15. We demonstrate that the synthesis of the powders can be performed by a simple manual mechanical grinding of the precursors for about 40 minutes, leading to solid solutions with an only minor content of unreacted precursors. X-ray diffraction, differential scanning calorimetry, and infrared spectroscopy techniques were used to investigate the structure, tetragonal-to-cubic phase transition, and vibrational characteristics of the organic cations with increasing GA+ and FA+ contents, respectively. The band gap and Urbach energies, obtained from ultraviolet-visible spectroscopy analyses, ranged from 1.58 to 1.65 eV and 23 to 36 meV, respectively, depending on the composition. These parameters demonstrate a non-random variation with x composition, which offers the possibility of a rational composition design for a given set of desired properties, demonstrating potential for optoelectronic applications. Finally, the system appears to have adequately tolerated heating for 12 hours at 120 °C in an ambient atmosphere, indicating high thermal stability and low ionic conductivity, which are desirable characteristics for solar cell applications. This journal is | en |
| dc.description.affiliation | Department of Physics and Chemistry São Paulo State University | |
| dc.description.affiliation | Department of Engineering University of Rio Verde | |
| dc.description.affiliationUnesp | Department of Physics and Chemistry São Paulo State University | |
| dc.format.extent | 4715-4728 | |
| dc.identifier | http://dx.doi.org/10.1039/d1cp04977a | |
| dc.identifier.citation | Physical Chemistry Chemical Physics, v. 24, n. 8, p. 4715-4728, 2022. | |
| dc.identifier.doi | 10.1039/d1cp04977a | |
| dc.identifier.issn | 1463-9076 | |
| dc.identifier.scopus | 2-s2.0-85125212331 | |
| dc.identifier.uri | http://hdl.handle.net/11449/223514 | |
| dc.language.iso | eng | |
| dc.relation.ispartof | Physical Chemistry Chemical Physics | |
| dc.source | Scopus | |
| dc.title | Structure, optoelectronic properties and thermal stability of the triple organic cation GAx FAx MA1-2 x PbI3system prepared by mechanochemical synthesis | en |
| dc.type | Artigo |