Nanoscale mapping of chemical composition in organic-inorganic hybrid perovskite films

Autor(es)

Szostak, R. ^{[1, 2]} ; Silva, J. C. ^[2] ; Turren-Cruz, S. -H. ^[3] ; Soares, M. M. ^[1] ; Freitas, R. O. ^[1] ; Hagfeldt, A. ^[4] ; Tolentino, H. C. N. ^[1] ; Nogueira, A. F. ^[2]

Afiliação do(s) autor(es)

^[1] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Lab Nanotecnol & Energia Solar, Chem Inst, POB 6154, BR-13083970 Campinas, SP - Brazil

^[3] Helmholtz Zentrum Berlin Materlialien & Energie, Kekulestr 5, D-12489 Berlin - Germany

^[4] Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photomol Sci, CH-1015 Lausanne - Switzerland

• Tipo de documento: Artigo Científico
• Fonte: SCIENCE ADVANCES; v. 5, n. 10 OCT 2019.
• Citações Web of Science: 1

Resumo

Lead-based organic-inorganic hybrid perovskite (OIHP) solar cells can attain efficiencies over 20%. However, the impact of ion mobility and/or organic depletion, structural changes, and segregation under operating conditions urge for decisive and more accurate investigations. Hence, the development of analytical tools for accessing the grain-to-grain OIHP chemistry is of great relevance. Here, we used synchrotron infrared nanospectroscopy (nano-FTIR) to map individual nanograins in OIHP films. Our results reveal a spatial heterogeneity of the vibrational activity associated to the nanoscale chemical diversity of isolated grains. It was possible to map the chemistry of individual grains in CsFAMA {[}Cs(0.05)FA(0.79)MA(0.16)Pb(I0.83Br0.17)(3)] and FAMA {[}FA(0.83)MA(0.17)Pb(I0.83Br0.17)(3)] films, with information on their local composition. Nanograins with stronger nano-FTIR activity in CsFAMA and FAMA films can be assigned to PbI2 and hexagonal polytype phases, respectively. The analysis herein can be extended to any OIHP films where organic cation depletion/accumulation can be used as a chemical label to study composition. (AU)

• Processo FAPESP: 17/11986-5 - Divisão de Pesquisa 1 - portadores densos de energia
• Beneficiário: Ana Flávia Nogueira
• Linha de fomento: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 17/12582-5 - Perovskitas com cátions mistos: relação entre estrutura, composição, propriedades eletrônicas e eficiência das células solares
• Beneficiário: Rodrigo Szostak
• Linha de fomento: Bolsas no Brasil - Doutorado