Charge Transfer Dynamics between Carbon Nanotubes and Hybrid Organic Metal Halide Perovskite Films
| Autor: | Mengjin Yang, Jeffrey L. Blackburn, Joseph J. Berry, Philip Schulz, Kai Zhu, Anne-Marie Dowgiallo |
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| Rok vydání: | 2016 |
| Předmět: |
Nanotube
Materials science Photoemission spectroscopy Halide Nanotechnology 02 engineering and technology Carbon nanotube Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Nanomaterials Band bending law Chemical physics General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Perovskite (structure) |
| Zdroj: | The journal of physical chemistry letters. 7(3) |
| ISSN: | 1948-7185 |
| Popis: | In spite of the rapid rise of metal organic halide perovskites for next-generation solar cells, little quantitative information on the electronic structure of interfaces of these materials is available. The present study characterizes the electronic structure of interfaces between semiconducting single walled carbon nanotube (SWCNT) contacts and a prototypical methylammonium lead iodide (MAPbI3) absorber layer. Using photoemission spectroscopy we provide quantitative values for the energy levels at the interface and observe the formation of an interfacial dipole between SWCNTs and perovskite. This process can be ascribed to electron donation from the MAPbI3 to the adjacent SWCNT making the nanotube film n-type at the interface and inducing band bending throughout the SWCNT layer. We then use transient absorbance spectroscopy to correlate this electronic alignment with rapid and efficient photoexcited charge transfer. The results indicate that SWCNT transport and contact layers facilitate rapid charge extraction and suggest avenues for enhancing device performance. |
| Databáze: | OpenAIRE |
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