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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

tructure, optoelectronic properties and thermal stability of the triple organic cation GA(x)FA(x)MA(1-2x)PbI(3) system prepared by mechanochemical synthesi

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Author(s):
Minussi, F. B. [1] ; Silva, L. A. [2] ; Araujo, E. B. [1]
Total Authors: 3
Affiliation:
[1] Sao Paulo State Univ, Dept Phys & Chem, BR-15385000 Ilha Solteira - Brazil
[2] Univ Rio Verde, Dept Engn, BR-75901970 Rio Verde - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 24, n. 8, p. 4715-4728, FEB 23 2022.
Web of Science Citations: 0
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 GA(x)FA(x)MA(1-2x)PbI(3) 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 degrees C in an ambient atmosphere, indicating high thermal stability and low ionic conductivity, which are desirable characteristics for solar cell applications. (AU)

FAPESP's process: 17/13769-1 - Multiferroic and ferroelectric materials for energy converters: synthesis, properties, phenomenology and applications
Grantee:José Antonio Eiras
Support Opportunities: Research Projects - Thematic Grants