Lead Iodide Thin Films via rf Sputtering

Autor(es)

Clemente da Silva Filho, Jose Maria ^[1] ; Villegas Borrero, Nelson Fabian ^[1] ; Viana, Gustavo Alexandre ^[1] ; Merlo, Rafael Borges ^[1] ; Marques, Francisco Chagas ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Gleb Wataghin Inst Phys, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Crystal Growth & Design; v. 20, n. 3, p. 1531-1537, MAR 2020.
• Citações Web of Science: 0

Resumo

Lead iodide (PbI2) is a precursor for the preparation of the organolead iodide perovskite (CH3NH3PbI3), which has been used in the fabrication of highly efficient solar cells. In this work, a novel route for the deposition of PbI2 thin films is performed by rf sputtering a target made from compressed PbI2 powder. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) revealed that the PbI2 films produced were uniform, pinhole-free, polycrystalline, and had low roughness. A small concentration of Pb nanocrystals observed within the films is attributed to differences in the sputtering yield of lead and iodide from the PbI2 target. A dependence of band gap on rf sputtering power was observed, which was associated with a reduction in the concentration of Pb nanocrystals. The PbI2 films were efficiently converted into CH3NH3PbI3 perovskite films through the immersion into a methylammonium iodide (MAI) solution, which also converted the remaining Pb nanocrystals into perovskite. This methodology has the potential to forge the way toward a new method for the fabrication of large-area perovskite solar cells. (AU)

• Processo FAPESP: 12/10127-5 - Pesquisa e desenvolvimento de materiais nanoestruturados para aplicações eletrônicas e de física de superfícies
• Beneficiário: Fernando Alvarez
• Modalidade de apoio: Auxílio à Pesquisa - Temático