Overcoming Redox Reactions at Perovskite-Nickel Oxide Interfaces to Boost Voltages in Perovskite Solar Cells
| Autor: | Taylor Moot, Cullen Chosy, James A. Raiford, Joseph M. Luther, Joseph J. Berry, Neal R. Armstrong, Eli J. Wolf, Luca Bertoluzzi, Erin L. Ratcliff, Jérémie Werner, Caleb C. Boyd, Ross A. Kerner, Axel F. Palmstrom, Shalinee Kavadiya, Stacey F. Bent, Zachary C. Holman, Camila de Paula, Michael D. McGehee, R. Clayton Shallcross, Arthur Onno, Zhengshan J. Yu |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Nickel oxide Inorganic chemistry Oxide Perovskite solar cell 02 engineering and technology Electron acceptor 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox 0104 chemical sciences chemistry.chemical_compound General Energy chemistry Oxidizing agent Thin film 0210 nano-technology Perovskite (structure) |
| Zdroj: | Joule. 4:1759-1775 |
| ISSN: | 2542-4351 |
| DOI: | 10.1016/j.joule.2020.06.004 |
| Popis: | Summary Nickel oxide (NiOx) hole transport layers (HTLs) are desirable contacts for perovskite photovoltaics because they are low cost, stable, and readily scalable; however, they deliver lower open-circuit voltages (VOCs) compared to organic HTLs. Here, we characterize and mitigate electron transfer-proton transfer reactions between NiOx HTLs and perovskite precursors. Using XPS and UPS characterization, we identify that Ni≥3+ metal cation sites in NiOx thin films act both as Bronsted proton acceptors and Lewis electron acceptors, deprotonating cationic amines and oxidizing iodide species, forming PbI2−xBrx-rich hole extraction barriers at the perovskite-NiOx interface. Titrating reactive Ni≥3+ surface states with excess A-site cation salts during perovskite active layer deposition yielded an increase in VOC values to 1.15 V and power conversion efficiencies of ∼20%. This may be a general finding for metal oxide contacts that act as Bronsted and Lewis acid-base reactants toward perovskite precursors, an observation that has also been made recently for TiO2 and SnO2 contacts. |
| Databáze: | OpenAIRE |
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