Size effects of a graphene quantum dot modified-blocking TiO2layer for efficient planar perovskite solar cells
| Autor: | Jaehoon Ryu, Jooyoun Kang, Jyongsik Jang, Seong Keun Kim, Jong Woo Lee, Kisu Lee, Juyoung Yun, Jungsup Lee, Haejun Yu, Doyk Hwang |
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| Rok vydání: | 2017 |
| Předmět: |
Fabrication
Materials science Renewable Energy Sustainability and the Environment Graphene Band gap Energy conversion efficiency Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Graphene quantum dot 0104 chemical sciences law.invention Hysteresis Quantum dot law General Materials Science 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 5:16834-16842 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta02242e |
| Popis: | Research on the addition of suitable materials into perovskite solar cells (PSCs) for improved performance is as important as the fabrication of efficient perovskite films themselves. An attempt to enhance the performance of planar-type perovskite solar cells was performed by introducing graphene quantum dots (GQDs) onto a blocking TiO2 layer via O2 plasma treatment. Furthermore, the bandgap of the GQDs was tuned through their size control and the effects of the GQD size on cell performance were explored. The GQDs can induce fast electron extraction and the formation of the improved perovskite quality. The devices with appropriately sized-GQDs showed an average of 10% enhancement compared with those of cells without GQDs and achieved 19.11% as the best power conversion efficiency (PCE). Furthermore, GQDs contributed to the reduction in the extent of current–voltage hysteresis, which was attributed to the planar structure. |
| Databáze: | OpenAIRE |
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