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Post-Healing of Defects: Alternative Way for Passivation of Carbon-Based Mesoscopic Perovskite Solar Cells via Hydrophobic Ligand Coordination

Abstract

The passivation of defects at the perovskite grain boundaries (GB) is crucial in achieving highly efficient and stable perovskite solar cells. Unlike widely used additive passivation method where the mixture of additives and perovskite precursor were used for preparing perovskite film, we herein developed a new defect post-healing method via dip-coating trioctylphosphine oxide (TOPO) ligand on pre-fabricated carbon-based mesoscopic perovskite solar cells (MPSCs). Since perovskites have formed before post-healing, TOPO ligands are selectively adsorbed on the exposed perovskite surface and hence have little influence on charge extraction of interfaces. The defects are post-healed via O atom in P=O bond coordinating to halide-deficiency sites, leading to an enhanced power conversion efficiency (PCE) from 11.0% to 12.8%. Moreover, due to the three hydrophobic long chain alkyls in TOPO, the device’ humidity stability has been also improved simultaneously.

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Publication details

The article was received on 01 Nov 2017, accepted on 05 Jan 2018 and first published on 08 Jan 2018


Article type: Communication
DOI: 10.1039/C7TA09646A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Post-Healing of Defects: Alternative Way for Passivation of Carbon-Based Mesoscopic Perovskite Solar Cells via Hydrophobic Ligand Coordination

    G. huang, C. Wang, H. Zhang, S. xu, Q. Xu and Y. Cui, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA09646A

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