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Experimental evaluation of room temperature crystallization and phase evolution of hybrid perovskite materials

Abstract

To overcome the problems of thermal, moisture and photo – stability of existing methylammonium based perovskites, formamidinium based compositions are introduced for photovoltaic application,. Formamidinium lead iodide (FAPbI3) and Methylammonium lead bromide (MAPbBr3) mixed compositions of hybrid organic – inorganic perovskite type solar cells have shown highest efficiency of 22.1%. For FAPbI3, two different polymorphs exist at room temperature, one is hexagonal non-perovskite phase (δ–phase) and the other is the perovskite cubic phase (α–phase). The non-perovskite phase can be detrimental to the solar cell performance. To eradicate the undesired phase, a systematic evaluation of phase formation and crystallization study is necessary. Here, we investigated the room temperature crystallization of perovskite and non-perovskite phases for FAPbI3 by solvent and antisolvent induced crystallization methods using two step sequential deposition method. For each phase, volume fraction is estimated using X–ray diffraction technique. At room temperature, δ-phase is found to grow as long one-dimensional nanorods and its volume fraction increases with the dipping time. It is observed that the presence of antisolvent has a moderate control on δ–phase growth. Experimentally, with the detailed solvent induced time dependent crystallization study, we have proved the effective elimination of the δ-phase and the stability of FA1-xMAxPbI3 perovskite phase.

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Publication details

The article was received on 26 Feb 2017, accepted on 07 Jun 2017 and first published on 07 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00402H
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Experimental evaluation of room temperature crystallization and phase evolution of hybrid perovskite materials

    S. Prathapani, D. Choudhary, S. Mallick, P. Bhargava and A. Yella, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00402H

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