Influence of Methylammonium Chloride on Wide-Bandgap Halide Perovskites Films for Solar Cells

Autor(es)

Guaita, Maria G. D. ; Szostak, Rodrigo ; da Silva, Francisco M. C. ; de Morais, Andreia ; Moral, Raphael F. ; Kodalle, Tim ; Teixeira, Veronica C. ; Sutter-Fella, Carolin M. ; Tolentino, Helio C. N. ; Nogueira, Ana F.

• Tipo de documento: Artigo Científico
• Fonte: ADVANCED FUNCTIONAL MATERIALS; v. N/A, p. 11-pg., 2023-09-03.

Resumo

Wide-bandgap perovskites are of paramount importance as the photoactive layer of the top cell in high-efficiency tandem solar cells. Comparably high Br contents are required to widen the perovskite bandgap. However, the increase in Br content causes heterogeneous halide distribution and photoinstability. Here, the positive effect of the additive methylammonium chloride (MACl) on the optical and electronic properties of Br-rich perovskite, deposited using N-methyl-2-pyrrolidone (NMP) as co-solvent and the gas quenching method, is investigated. Simultaneous in situ grazing-incidence wide-angle X-ray scattering and photoluminescence spectroscopy are used to track the evolution of the structural and optoelectronic properties of the perovskites with different amounts of Br and MACl during the spin-coating and thermal annealing steps. The formation mechanism is elucidated in the presence of MACl. It is observed that chloride ions inhibit the intermediate phases, favoring the formation of a perovskite phase with higher crystallinity. Nano X-ray fluorescence mapping recognizes Br-richer and poorer nanometric domains, whose average sizes reduce for samples with MACl. In conclusion, it is demonstrated that adding MACl affects the formation of wide-bandgap perovskites via destabilization of the intermediate phases and acts on the homogenization of the halide distribution, leading to improved solar cell performances. Wide-bandgap perovskites are relevant materials for tandem cells. However, the addition of bromine, to increase the bandgap, leads to the formation of a perovskite richer in defects, with halide distribution heterogeneity and photoinstability. Here, the study of the impact and mode of action of methylammonium chloride (MACl) additive, shows the inhibition of intermediates formation and the halide distribution homogenization with MACl.image (AU)

• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 21/01357-6 - Células solares híbridas de perovskita investigadas em operando por técnicas de radiação síncrotron
• Beneficiário: Rodrigo Szostak
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/25765-6 - Experimentos in situ com SAXS e WAXS em síncrotron para estudar reações e mecanismos de formação de (nano)materiais de halogenetos de chumbo
• Beneficiário: Raphael Fernando Moral
• Modalidade de apoio: Bolsas no Brasil - Doutorado