Phase Distribution and Carrier Dynamics in Multiple-Ring Aromatic Spacer-Based Two-Dimensional Ruddlesden-Popper Perovskite Solar Cells
- 28 April 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 14 (4), 4871-4881
- https://doi.org/10.1021/acsnano.0c00875
Abstract
Two-dimensional (2D) perovskites with natural multi-quantum-well structure have been reported to offer better stability compared to 3D perovskites. However, the understanding of the exciton separation and transport mechanism in 2D perovskites and developing more efficient organic spacers remain considerable challenges, as the 2D perovskites exhibit large exciton binding energy due to quantum confinement. Here, a class of multiple-ring aromatic ammoniums, 1-naphthalenemethylammonium (NpMA) and 9-anthracenemethylammonium (AnMA), was developed as spacers for 2D Ruddlesden-Popper (RP) perovskite solar cells (PSCs). In addition to significantly enhanced stability, the device based on (NpMA)(2)(MA)(n-1)PbnI3n+1 (average n = 4) exhibits a champion efficiency of 17.25% and a high open-circuit voltage of 1.24 V. The outstanding photovoltaic performance could be ascribed to the ultrafast exciton migration (within 7 ps) from 2D phases to 3D-like phases, which were confirmed by charge carrier dynamics results, leading to efficient exciton separation, charge transportation, and collection. This work facilitates understanding the working mechanism of 2D PSCs in-depth and offers an efficient way to further boost their efficiency and stability by developing multiple-ring aromatic spacers.Funding Information
- National Natural Science Foundation of China (21875122, 51673097)
This publication has 59 references indexed in Scilit:
- The emergence of perovskite solar cellsNature Photonics, 2014
- Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH 3 NH 3 PbI 3Science, 2013
- Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%Scientific Reports, 2012
- Nanorod solar cell with an ultrathin a-Si:H absorber layerApplied Physics Letters, 2011
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009
- Comparison of the device physics principles of planar and radial p-n junction nanorod solar cellsJournal of Applied Physics, 2005
- Space-Charge Limited PhotocurrentPhysical Review Letters, 2005
- Electroluminescence from an Organic−Inorganic Perovskite Incorporating a Quaterthiophene Dye within Lead Halide Perovskite LayersChemistry of Materials, 1999
- Tailoring of energy levels in lead chloride based layered perovskites and energy transfer between the organic and inorganic planesChemical Physics Letters, 1999
- Preparation and characterization of layered lead halide compoundsJournal of the American Chemical Society, 1991