Study on the Passivation of Defect States in Wide-Bandgap Perovskite Solar Cells by the Dual Addition of KSCN and KCl
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| Publicado en: | Nanomaterials vol. 15, no. 20 (2025), p. 1602-1618 |
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| Otros Autores: | , , , |
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MDPI AG
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| Acceso en línea: | Citation/Abstract Full Text + Graphics Full Text - PDF |
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| 022 | |a 2079-4991 | ||
| 024 | 7 | |a 10.3390/nano15201602 |2 doi | |
| 035 | |a 3265927249 | ||
| 045 | 2 | |b d20250101 |b d20251231 | |
| 084 | |a 231543 |2 nlm | ||
| 100 | 1 | |a Li, Min |u College of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China | |
| 245 | 1 | |a Study on the Passivation of Defect States in Wide-Bandgap Perovskite Solar Cells by the Dual Addition of KSCN and KCl | |
| 260 | |b MDPI AG |c 2025 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a Wide-bandgap (WBG) perovskite solar cells (PSCs) are critical for high-efficiency tandem photovoltaic devices, but their practical application is severely limited by phase separation and poor film quality. To address these challenges, this study proposes a dual-additive passivation strategy using potassium thiocyanate (KSCN) and potassium chloride (KCl) to synergistically optimize the crystallinity and defect state of WBG perovskite films. The selection of KSCN/KCl is based on their complementary functionalities: K+ ions occupy lattice vacancies to suppress ion migration, Cl− ions promote oriented crystal growth, and SCN− ions passivate surface defects via Lewis acid-base interactions. A series of KSCN/KCl concentrations (relative to Pb) were tested, and the effects of dual additives on film properties and device performance were systematically characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), space-charge-limited current (SCLC), current-voltage (J-V), and external quantum efficiency (EQE) measurements. Results show that the dual additives significantly enhance film crystallinity (average grain size increased by 27.0% vs. control), reduce surface roughness (from 86.50 nm to 24.06 nm), and passivate defects-suppressing non-radiative recombination and increasing electrical conductivity. For WBG PSCs, the champion device with KSCN (0.5 mol%) + KCl (1 mol%) exhibits a power conversion efficiency (PCE) of 16.85%, representing a 19.4% improvement over the control (14.11%), along with enhanced open-circuit voltage (Voc: +2.8%), short-circuit current density (Jsc: +6.7%), and fill factor (FF: +8.9%). Maximum power point (MPP) tracking confirms superior operational stability under illumination. This dual-inorganic-additive strategy provides a generalizable approach for the rational design of stable, high-efficiency WBG perovskite films. | |
| 653 | |a Silicon | ||
| 653 | |a Additives | ||
| 653 | |a Scanning electron microscopy | ||
| 653 | |a Defects | ||
| 653 | |a Lattice vacancies | ||
| 653 | |a Ion migration | ||
| 653 | |a Ions | ||
| 653 | |a Solar cells | ||
| 653 | |a Crystallinity | ||
| 653 | |a X-ray diffraction | ||
| 653 | |a Crystal growth | ||
| 653 | |a Electrical resistivity | ||
| 653 | |a Grain size | ||
| 653 | |a Potassium | ||
| 653 | |a Quantum efficiency | ||
| 653 | |a Surface defects | ||
| 653 | |a Thiocyanates | ||
| 653 | |a Photoelectrons | ||
| 653 | |a Photovoltaic cells | ||
| 653 | |a Radiative recombination | ||
| 653 | |a Efficiency | ||
| 653 | |a Perovskites | ||
| 653 | |a Voltage | ||
| 653 | |a Crystal lattices | ||
| 653 | |a Photons | ||
| 653 | |a Chloride | ||
| 653 | |a Passivity | ||
| 653 | |a Photovoltaics | ||
| 653 | |a Costs | ||
| 653 | |a Lewis acid | ||
| 653 | |a Energy gap | ||
| 653 | |a Energy conversion efficiency | ||
| 653 | |a Crystal defects | ||
| 653 | |a Surface roughness | ||
| 653 | |a Phase separation | ||
| 653 | |a Open circuit voltage | ||
| 653 | |a Electrical conductivity | ||
| 653 | |a Potassium chloride | ||
| 653 | |a Short-circuit current | ||
| 653 | |a Photoelectron spectroscopy | ||
| 653 | |a Photoluminescence | ||
| 700 | 1 | |a Peng Zhaodong |u College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China | |
| 700 | 1 | |a Yao, Xin |u College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China | |
| 700 | 1 | |a Huang, Jie |u College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China | |
| 700 | 1 | |a Zhang, Dawei |u College of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China | |
| 773 | 0 | |t Nanomaterials |g vol. 15, no. 20 (2025), p. 1602-1618 | |
| 786 | 0 | |d ProQuest |t Materials Science Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3265927249/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text + Graphics |u https://www.proquest.com/docview/3265927249/fulltextwithgraphics/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3265927249/fulltextPDF/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |