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Issue 4, 2016
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Intermixing-seeded growth for high-performance planar heterojunction perovskite solar cells assisted by precursor-capped nanoparticles

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Abstract

This work proposes a novel approach to modulate the nucleation and growth of perovskite crystals in planar perovskite (CH3NH3PbI3−xClx) solar cells by intermixing precursor-capped inorganic nanoparticles of PbS. A small amount of dispersed PbS nanoparticles which were covered with perovskite precursor molecules of methylammonium iodide (CH3NH3I, MAI) through the ligand-exchange treatment functioned as effective seed-like nucleation sites to promote the formation of perovskite lattice structures. Through this intermixing-seeded growth technique, substantial morphological improvements, such as increased crystal domains, enhanced coverage, and uniformity, were realized in the perovskite thin films, and the corresponding solar cell devices exhibited a promising power conversion efficiency of 17.4%, showing an enhancement of approximately 25% compared to that of the controlled pristine solar cell device. The substantially enhanced crystal orientation, particularly along the direction perpendicular to the substrate, was evident from the synchrotron-based grazing incidence wide-angle X-ray scattering data. This observation was consistent with the enhanced carrier diffusion lengths and excellent reproducibility of high fill factors of the planar heterojunction perovskite devices fabricated through the proposed technique.

Graphical abstract: Intermixing-seeded growth for high-performance planar heterojunction perovskite solar cells assisted by precursor-capped nanoparticles

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Publication details

The article was received on 21 Oct 2015, accepted on 07 Jan 2016 and first published on 11 Jan 2016


Article type: Paper
DOI: 10.1039/C5EE03229F
Citation: Energy Environ. Sci., 2016,9, 1282-1289
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    Intermixing-seeded growth for high-performance planar heterojunction perovskite solar cells assisted by precursor-capped nanoparticles

    S. Li, C. Chang, Y. Wang, C. Lin, D. Wang, J. Lin, C. Chen, H. Sheu, H. Chia, W. Wu, U. Jeng, C. Liang, R. Sankar, F. Chou and C. Chen, Energy Environ. Sci., 2016, 9, 1282
    DOI: 10.1039/C5EE03229F

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