Functional graded fullerene derivatives for improving the fill factor and device stability of inverted-type perovskite solar cells
| Autor: | Yuhlong Oliver Su, Shih Chieh Yeh, Hsin Ming Cheng, Chun Guey Wu, Sheng Hui Chen, Chin-Ti Chen, Hsin Shaw, Kuo Yuan Chiu, Sheng Hsiung Chang, Wei Chen Huang |
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| Rok vydání: | 2018 |
| Předmět: |
Morphology (linguistics)
Fullerene Materials science Mechanical Engineering Bioengineering 02 engineering and technology General Chemistry Electron Photothermal therapy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences X-ray photoelectron spectroscopy Chemical engineering Mechanics of Materials Molecule General Materials Science Electrical and Electronic Engineering Thin film 0210 nano-technology Perovskite (structure) |
| Zdroj: | Nanotechnology. 29(30) |
| ISSN: | 1361-6528 |
| Popis: | A graded fullerene derivative thin film was used as a dual-functional electron transport layer (ETL) in CH3NH3PbI3 (MAPbI3) solar cells, to improve the fill factor (FF) and device stability. The graded ETL was made by mixing phenyl-C61-butyric acid methyl ester (PCBM) molecules and C60-diphenylmethanofullerene-oligoether (C60-DPM-OE) molecules using the spin-coating method. The formation of the graded ETLs can be due to the phase separation between hydrophobic PCBM and hydrophilic C60-DPM-OE, which was confirmed by XPS depth-profile analysis and an electron energy-loss spectroscope. Comprehensive studies were carried out to explore the characteristics of the graded ETLs in MAPbI3 solar cells, including the surface properties, electronic energy levels, molecular packing properties and energy transfer dynamics. The elimination of the s-shape in the current density–voltage curves results in an increase in the FF, which originates from the smooth contact between the C60-DPM-OE and hydrophilic MAPbI3 and the formation of the more ordered ETL. There was an improvement in device stability mainly due to the decrease in the photothermal induced morphology change of the graded ETLs fabricated from two fullerene derivatives with distinct hydrophilicity. Consequently, such a graded ETL provides dual-functional capabilities for the realization of stable high-performance MAPbI3 solar cells. |
| Databáze: | OpenAIRE |
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