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Tailoring the nucleation and grain growth by precursor phase ratio for efficient organic lead halide perovskite optoelectronic devices

Abstract

The nucleation and growth of organic-inorganic hybrid perovskite films induced by the molar ratio of precursor components and its role on optoelectronic performance are investigated. Lead iodide (PbI2), methylammonium acetate (MAAc) and methylammonium iodide (MAI) mixed in different ratios were used as starting precursors for active layer deposition. While all as cast films showed the presence of precursor intermediate (PbIx·MAAc·MAI), the films derived from 1:1:1 and 1:0.5:1 ratio also exhibited crystallization of perovskite (CH3NH3PbI3) phase during the spin coating process. The nucleation and crystallization of perovskite phase in films derived from equimolar precursor ratio were found to be key to grow larger, smoother and single crystalline grains along the thickness leading to higher carrier lifetimes. Perovskite solar cells fabricated utilizing such morphology showed a much higher power conversion efficiency irrespective of active layer thickness. Further, methyl ammonium bromide based perovskite light emitting diodes were also fabricated using the aforementioned equimolar precursor ratio which revealed superior device performance compared to diodes with active layers derived from other precursor ratios. This work highlights a facile deposition technique and growth mechanism to attain reproducible low cost and high-performance perovskite optoelectronic devices.

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Publication details

The article was received on 29 Jun 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017


Article type: Communication
DOI: 10.1039/C7TC02928D
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Tailoring the nucleation and grain growth by precursor phase ratio for efficient organic lead halide perovskite optoelectronic devices

    S. Venkatesan, M. Hasan, J. Kim, N. R. Rady, S. Sohal, E. Neier, Y. Yao and A. Zakhidov, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02928D

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