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Study of perovskite solar cells based on mixed-organic-cation FAxMA1−xPbI3 absorption layer

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Abstract

Mixed-organic-cation FAxMA1−xPbI3 films were prepared using a one-step solution deposition method in ambient air. The formamidinium (FA+) fraction ‘x’ was varied from 0.1 to 1 by changing the amounts of formamidinium iodide (FAI) and methylammonium iodide (MAI) in the precursor solution. Perovskite solar cells (PSCs) with a structure of FTO glass/compact TiO2/mesoporous TiO2/FAxMA1−xPbI3/carbon electrode were designed and fabricated. The effects of the FA+ fraction ‘x’ on the structure, morphology and optical properties of the FAxMA1−xPbI3 films as well as the photovoltaic performance of PSCs were studied. The results showed that the photovoltaic inactive δ-phase FAPbI3 can be formed in the presence of high contents of FA+ (x = 0.8 and 1.0). The band gap of FAxMA1−xPbI3 decreased from 1.58 eV to 1.49 eV when the FA+ fraction x increased from 0.1 to 1. The PSCs based on FA0.4MA0.6PbI3 exhibited an optimal photovoltaic performance, yielding Voc of 0.8 V, Jsc of 22.84 mA cm−2, FF of 0.48 and PCE of 8.77%.

Graphical abstract: Study of perovskite solar cells based on mixed-organic-cation FAxMA1−xPbI3 absorption layer

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Publication details

The article was received on 10 Apr 2019, accepted on 06 May 2019 and first published on 06 May 2019


Article type: Paper
DOI: 10.1039/C9CP02003A
Phys. Chem. Chem. Phys., 2019, Advance Article

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    Study of perovskite solar cells based on mixed-organic-cation FAxMA1−xPbI3 absorption layer

    Y. Yang, J. Luo, A. Wei, J. Liu, Y. Zhao and Z. Xiao, Phys. Chem. Chem. Phys., 2019, Advance Article , DOI: 10.1039/C9CP02003A

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