ENHANCING STABILITY AND REDUCING ANNEALING TEMPERATURE OF CSPBI3 FILMS THROUGH CONTROLLED SOLUTION AGING AND HI INCORPORATION

BRUNO OLIVEIRA; Eralci Moreira Terézio; Paulo Ernesto Marchezi; Luis Craco

Título do Trabalho

Autores

BRUNO OLIVEIRA
Eralci Moreira Terézio
Paulo Ernesto Marchezi
Luis Craco

Modalidade

Pôster - resumo

Área temática

Materiais e biomateriais

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1460026-enhancing-stability-and-reducing-annealing-temperature-of-cspbi3-films-through-controlled-solution-aging-and-hi-

ISBN

978-65-272-2467-9

Palavras-Chave

Perovskite, CsPbI3, Stability, Precursor solution

Resumo

The CsPbI3 perovskite has been widely studied for photovoltaic applications due to its excellent optoelectronic properties, such as a favorable bandgap, high carrier mobility, and high absorption coefficient. However, its application faces synthesis and stability challenges, requiring temperatures above 300 °C for the crystallization of the photoactive black phase, and presenting unwanted transitions to the yellow phase during cooling. In this work, the use of hydroiodic acid (HI) as an additive was investigated to mitigate these issues, alongside a study on the precursor solution aging process and the existence of an optimization window for the produced films [1–3]. The incorporation of HI, by inducing lattice strain, enabled a reduction in the annealing temperature to 100 °C, in addition to improving film stability. Comparatively, the films processed with HI maintained optical properties similar to those of samples produced in a controlled atmosphere without HI addition, presenting a bandgap of 1.75 eV, consistent with the literature. Additionally, the study of precursor solution aging revealed an optimization window, UV-Vis spectroscopy showed that the precursor solution aged for 7 days results in films that preserved their absorption patterns even 4 days after deposition. Scanning Electron Microscopy (SEM) images corroborated this result, evidencing that aging favors the formation of larger grains and reduces porosity. It is concluded, therefore, that controlling the aging time and using HI are effective strategies to obtain CsPbI3 films with superior properties and stability. Acknowledgements: INEO (FAPESP - processo nº 2025/27044-5 e CNPq - processo: 408449/2024-1), CAPES, CALPQPN – UFMT. References: 1. Y. Gao, W. Xu, F. He, T. Fan, W. Cai, X. Zhang, and G. Wei, Advanced Energy and Sustainability Research 3, 1 (2022). 2. B. Li, Q. Dai, S. Yun, and J. Tian, J. Mater. Chem. A Mater. 9, 6732 (2021). 3. H. Tsai, W. Nie, Y. H. Lin, J. C. Blancon, S. Tretiak, J. Even, G. Gupta, P. M. Ajayan, and A. D. Mohite, Adv. Energy Mater. 7, 1 (2017).

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

OLIVEIRA, BRUNO et al.. ENHANCING STABILITY AND REDUCING ANNEALING TEMPERATURE OF CSPBI3 FILMS THROUGH CONTROLLED SOLUTION AGING AND HI INCORPORATION.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1460026-ENHANCING-STABILITY-AND-REDUCING-ANNEALING-TEMPERATURE-OF-CSPBI3-FILMS-THROUGH-CONTROLLED-SOLUTION-AGING-AND-HI-. Acesso em: 10/08/2026