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Issue 5, 2018
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Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells

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Abstract

Efficient charge collection is critical in large area (quasi-) planar configuration perovskite solar cells (PSCs) as the cell operation relies on the diffusion of photo-generated charge carriers to charge collector layers. Many defects/traps in the polycrystalline perovskite absorber layer strongly affect the charge collection efficiency because the 2D-like top charge collection layer barely penetrates into the 3D grain boundaries in the perovskite layer to efficiently collect the charge carrier. Inspired by blood capillaries for efficient mass exchange, a charge-collection nano-network for efficient charge collection was incorporated into the perovskite absorber using low-cost, stable amino-functionalized graphene (G-NH2). The integration of such an unprecedented structure enables very efficient charge collection, leading to the significant enhancement of the power conversion efficiency of 1 × 1 cm2 MAPbI3 PSCs from 14.4 to 18.7% with higher reproducibility, smaller hysteresis and enhanced stability. The physicochemical mechanisms underlying the role of this nano charge-collection nano-network in boosting the charge collection in PSCs are elucidated comprehensively, using a combined experimental and theoretical approach, pointing to a new direction towards up-scaling of high-efficiency PSCs.

Graphical abstract: Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells

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Publication details

The article was received on 02 May 2018, accepted on 21 Jun 2018 and first published on 21 Jun 2018


Article type: Communication
DOI: 10.1039/C8MH00511G
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Mater. Horiz., 2018,5, 868-873

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    Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells

    Y. Wang, Y. Zhou, T. Zhang, M. Ju, L. Zhang, M. Kan, Y. Li, X. C. Zeng, Nitin. P. Padture and Y. Zhao, Mater. Horiz., 2018, 5, 868
    DOI: 10.1039/C8MH00511G

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