Grain Boundary Defect Passivation of Triple Cation Mixed Halide Perovskite with Hydrazine-Based Aromatic Iodide for Efficiency Improvement
| Autor: | Ashim Gurung, Tawabur Rahman, Buddhi Sagar Lamsal, Khalid Emshadi, Jyotshna Pokharel, Khan Mamun Reza, Ashiqur Rahman Laskar, Quinn Qiao, Ashraful Haider Chowdhury, Nabin Ghimire, Abiral Baniya, Wenqin Luo, Raja Sekhar Bobba, Sheikh Ifatur Rahman, Behzad Bahrami |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Passivation Iodide Inorganic chemistry Energy conversion efficiency Halide Perovskite solar cell 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry General Materials Science Grain boundary Crystallite 0210 nano-technology Perovskite (structure) |
| Zdroj: | ACS applied materialsinterfaces. 12(37) |
| ISSN: | 1944-8252 |
| Popis: | Perovskites have been unprecedented with a relatively sharp rise in power conversion efficiency in the last decade. However, the polycrystalline nature of the perovskite film makes it susceptible to surface and grain boundary defects, which significantly impedes its potential performance. Passivation of these defects has been an effective approach to further improve the photovoltaic performance of the perovskite solar cells. Here, we report the use of a novel hydrazine-based aromatic iodide salt or phenyl hydrazinium iodide (PHI) for secondary post treatment to passivate surface and grain boundary defects in triple cation mixed halide perovskite films. In particular, the PHI post treatment reduced current at the grain boundaries, facilitated an electron barrier, and reduced trap state density, indicating suppression of leakage pathways and charge recombination, thus passivating the grain boundaries. As a result, a significant enhancement in power conversion efficiency to 20.6% was obtained for the PHI-treated perovskite device in comparison to a control device with 17.4%. |
| Databáze: | OpenAIRE |
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