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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.)

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

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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]
Total Authors: 8
[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
Total Affiliations: 4
Document type: Journal article
Source: SCIENCE ADVANCES; v. 5, n. 10 OCT 2019.
Web of Science Citations: 0

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)

FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
Grantee:Ana Flávia Nogueira
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 17/12582-5 - Perovskites with mixed cations: relationship between structure, composition, electronic properties and efficiency of solar cells
Grantee:Rodrigo Szostak
Support type: Scholarships in Brazil - Doctorate