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Issue 20, 2019
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Morphology control towards a greener, non-halogenated solvent system processed CH3NH3PbI3 film for high performance perovskite solar cells

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Abstract

One of the advantages of perovskite solar cells is that they are compatible with low-cost and large-scale solution processes via the roll-to-roll technique. Green solvent engineering plays an important role in large-scale manufacturing. N-Methyl pyrrolidone (NMP) is considered to be less toxic and a biodegradable compound, which is less harmful to the human body and the environment. However, it is difficult to achieve a high film quality for an NMP-processed perovskite film in a short time. In this communication, we developed a two-step green anti-solvent engineering technique to rapidly tune the morphology of the NMP-processed perovskite film. The first step was to deposit ethyl acetate (EA) on top of the precursor film to induce fast nucleation. Second, a methylammonium chloride (MACl) solution dissolved in isopropanol (IPA) was added to affect the crystal growth process and subsequently form a two-layer structured perovskite film including MAPbI3 as a bottom layer and mixed MAPbI3/MAPbIxCl3−x as an upper layer. The upper layer showed a significantly enhanced degree of crystallinity and reduced trap states. It has been recognized that MAPbIxCl3−x has a higher LUMO level than that of MAPbI3. Thus, the enrichment of a Cl-based perovskite near/at the surface can promote the efficient charge transfer. Furthermore, the limited content of MAPbIxCl3−x in MAPbI3 barely affects the entire absorption of the perovskite and thus the JSC of the device. The as-prepared inverted PSC yields a high PCE of 16%, mainly attributing to the obviously improved VOC and JSC, while the reference device containing the perovskite layer treated only by EA shows a PCE of 14.36%.

Graphical abstract: Morphology control towards a greener, non-halogenated solvent system processed CH3NH3PbI3 film for high performance perovskite solar cells

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Publication details

The article was received on 12 Feb 2019, accepted on 03 Apr 2019 and first published on 04 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00812H
J. Mater. Chem. C, 2019,7, 6004-6011

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    Morphology control towards a greener, non-halogenated solvent system processed CH3NH3PbI3 film for high performance perovskite solar cells

    W. Tan, P. Cheng, Y. Zhang, J. Liang, X. Chen, Y. Liu and Y. Min, J. Mater. Chem. C, 2019, 7, 6004
    DOI: 10.1039/C9TC00812H

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