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Perovskites with mixed cations: relationship between structure, composition, electronic properties and efficiency of solar cells

Grant number: 17/12582-5
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): September 01, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Ana Flávia Nogueira
Grantee:Rodrigo Szostak
Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated scholarship(s):18/25801-0 - Preparation of the highly efficient perovskite solar cells through the compressed air gas quenching method and lead replacement by barium, BE.EP.DR


Photovoltaic solar energy is an important alternative for the diversification of the energy matrix and reduction of greenhouse gas emissions. The market is dominated by silicon solar cells that has decades of study, modest efficiency and stability. However, in the last four years, perovskite solar cells have drawn attention from the scientific community and the photovoltaic industry. Perovskite has a general formula ABX3, and the perovskites used in solar cells have "A" composed mainly of organic cations (methylammonium (MA) and/or formamidinium (FA)) or inorganic (Cs+ and/or Rb+), while "B" is lead or tin ion (Pb2+, Sn2+) and "X" is a halogen ion (Br- and/or I-). The addition of small amounts of Cs+ and Rb+ (0-15%) in perovskites with FA or FAMA improves the stability and keep the high efficiency of solar cells, however, a few detailed information about the true contribution and distribution of inorganic cations in perovskite matrix was reported. Thus, this doctoral project proposes to study the influence of these cations in crystalline structure, electronic properties, stability and efficiency of solar cells. For this, it will be developed a preparation method without use inert atmosphere aiming an industrial application and advanced characterizations employing synchrotron light. Perovskites will be prepared with compositions that have high efficiency with all combinations of cations (MA, FA, Cs+ and Rb+) and will be mainly characterized in the high resolution X-ray diffraction, fluorescence and scattering techniques, time resolved photoluminescence and infrared nano spectroscopy with in situ and/or ex situ experiments using Synchrotron light.

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SZOSTAK, R.; SILVA, J. C.; TURREN-CRUZ, S. -H.; SOARES, M. M.; FREITAS, R. O.; HAGFELDT, A.; TOLENTINO, H. C. N.; NOGUEIRA, A. F. Nanoscale mapping of chemical composition in organic-inorganic hybrid perovskite films. SCIENCE ADVANCES, v. 5, n. 10 OCT 2019. Web of Science Citations: 0.
SZOSTAK, RODRIGO; MARCHEZI, PAULO ERNESTO; MARQUES, ADRIANO DOS SANTOS; DA SILVA, JEANN CARLOS; DE HOLANDA, MATHEUS SERRA; SOARES, MARCIO MEDEIROS; NOGUEIRA TOLENTINO, HELIO CESAR; NOGUEIRA, ANA FLAVIA. Exploring the formation of formamidinium-based hybrid perovskites by antisolvent methods: in situ GIWAXS measurements during spin coating. SUSTAINABLE ENERGY & FUELS, v. 3, n. 9, p. 2287-2297, SEP 1 2019. Web of Science Citations: 1.
DE HOLANDA, MATHEUS S.; SZOSTAK, RODRIGO; MARCHEZI, PAULO E.; DUARTE, LUIS G. T. A.; GERMINO, JOSE C.; ATVARS, TERESA D. Z.; NOGUEIRA, ANA F. In Situ 2D Perovskite Formation and the Impact of the 2D/3D Structures on Performance and Stability of Perovskite Solar Cells. SOLAR RRL, v. 3, n. 9, SI JULY 2019. Web of Science Citations: 2.
HOWARD, JOHN M.; TENNYSON, ELIZABETH M.; BARIK, SABYASACHI; SZOSTAK, RODRIGO; WAKS, EDO; TONEY, MICHAEL F.; NOGUEIRA, ANA F.; NEVES, BERNARDO R. A.; LEITE, MARINA S. Humidity-Induced Photoluminescence Hysteresis in Variable Cs/Br Ratio Hybrid Perovskites. Journal of Physical Chemistry Letters, v. 9, n. 12, p. 3463-3469, JUN 21 2018. Web of Science Citations: 11.

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