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Structural Design Considerations of Solution-Processible Graphenes as Interfacial Materials via Controllable Synthesis to Achieve Highly Efficient, Stable, and Printable Planar Perovskite Solar Cells

Abstract

The solution-processible graphenes (represented by reduced graphene oxides, rGOs) have shown promising abilities as HTLs in perovskite solar cells (PeSCs). However, there has been no attempt to systematically tailor the rGO characteristics to the specifications of PeSCs. Furthermore, applications of the rGO HTLs have been limited in spin-coating system, which is incompatible with roll-to-roll manufacturing. Here, with the aid of polymer-graphene hybrid structure and controllable synthetic method, we successfully develop a much more feasible rGO HTL and demonstrate highly efficient, stable, and printable p-i-n planar PeSCs with facile one-step processing. The characteristics of developed polyacrylonitrile-grafted rGOs (PRGOs) are optimized by the synthetic conditions including the γ-radiation intensity (200, 400, and 600 kGy) and the concentration of the acrylonitrile (AN) precursor (2, 4, and 6 wt%). It is revealed that the PRGO synthesized with the lower AN concentration and the higher irradiation intensity (PRGO_2-600) is the most suitable for PeSCs HTL. The PRGO_2-600 effectively raises the average power conversion efficiencies (PCEs) of PeSCs by ~36% compared to those of conventional PeSCs using the PEDOT:PSS HTL. The comprehensive investigations confirm that the enhanced device-efficiency stems from (1) the favorable interlayer characteristics of the PRGO itself and (2) the well-crystallized perovskite layer grown on the PRGO. In addition to the PCE, the chemically inert PRGOs can also maintain their electrical properties over time and retard the decomposition of the perovskite films, thereby prolonging the operation-time of PeSCs in the atmosphere. More importantly, the applicability of the PRGO HTL is clearly verified even in roll-to-roll compatible slot-die coating system with exhibiting comparable performances to those of the spin-coating system.

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Publication details

The article was received on 15 Jul 2018, accepted on 11 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8NR05698F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Structural Design Considerations of Solution-Processible Graphenes as Interfacial Materials via Controllable Synthesis to Achieve Highly Efficient, Stable, and Printable Planar Perovskite Solar Cells

    J. Yeo, Y. Seo, C. Jung and S. Na, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05698F

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