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Halogen-substituted Fullerene Derivatives for Interface Engineering of Perovskite Solar Cells

Abstract

The interface between perovskite and charge transport layers is critical for the power conversion efficiency and stability of perovskite solar cells (PSCs). We report for the first time the exploration of three novel fullerene derivatives, N-ethyl-2-arylvinyl-5-methyl fulleropyrrolidine (NAMF) with H, Cl or Br substitutions on its pyrrolidine side-chain (namely NAMF-H, NAMF-Cl and NAMF-Br), via a low cost and one-step reaction from C60, as the interlayer to enhance efficiency and eliminate hysteresis in planar heterojunction PSCs. The crystallinity of MAPbI3 perovskite cast on these interlayer materials was found similar, but the grain size increased and the grain boundaries reduced. All three fullerene derivatives have well-aligned LUMO levels that facilitate electron transport from perovskite to TiO2, and reduce trap density and charge recombination in PSCs, leading to enhanced device efficiency and reduced hysteresis. Notably, the NAMF-Cl interlayer was found to chlorinate the TiO2 electron transport layer, leading to an enhanced PCE of 19.2 % from the reverse scan and 17.7 % from the forward scan, outperforming the PCBM-based PSC device. Our work adds new direction to the design of new fullerene derivatives with favorable physical and electrical properties as interlayer materials to improve the performance of PSCs.

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Publication details

The article was received on 14 Aug 2018, accepted on 27 Sep 2018 and first published on 27 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07904H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Halogen-substituted Fullerene Derivatives for Interface Engineering of Perovskite Solar Cells

    H. Wang, F. Cai, M. Zhang, P. Wang, J. Yao, R. Gurney, F. Li, D. Liu and T. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07904H

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