Efficient charge extraction and slow recombination in organic–inorganic perovskites capped with semiconducting single-walled carbon nanotubes
| Autor: | Joseph J. Berry, Noah J. Stanton, Anne-Marie Dowgiallo, Jeffrey L. Blackburn, Philip Schulz, Mengjin Yang, Rachelle Ihly, Obadiah G. Reid, Andrew J. Ferguson, Kai Zhu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Nanotechnology 02 engineering and technology Carbon nanotube Electron 010402 general chemistry 01 natural sciences law.invention Condensed Matter::Materials Science chemistry.chemical_compound law Photovoltaics Environmental Chemistry Thin film Perovskite (structure) Renewable Energy Sustainability and the Environment business.industry 021001 nanoscience & nanotechnology Pollution 0104 chemical sciences Nuclear Energy and Engineering chemistry Titanium dioxide Optoelectronics Charge carrier 0210 nano-technology business Layer (electronics) |
| Zdroj: | Energy & Environmental Science. 9:1439-1449 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/c5ee03806e |
| Popis: | Metal-halide based perovskite solar cells have rapidly emerged as a promising alternative to traditional inorganic and thin-film photovoltaics. Although charge transport layers are used on either side of perovskite absorber layers to extract photogenerated electrons and holes, the time scales for charge extraction and recombination are poorly understood. Ideal charge transport layers should facilitate large discrepancies between charge extraction and recombination rates. Here, we demonstrate that highly enriched semiconducting single-walled carbon nanotube (SWCNT) films enable rapid (sub-picosecond) hole extraction from a prototypical perovskite absorber layer and extremely slow back-transfer and recombination (hundreds of microseconds). The energetically narrow and distinct spectroscopic signatures for charges within these SWCNT thin films enables the unambiguous temporal tracking of each charge carrier with time-resolved spectroscopies covering many decades of time. The efficient hole extraction by the SWCNT layer also improves electron extraction by the compact titanium dioxide electron transport layer, which should reduce charge accumulation at each critical interface. Finally, we demonstrate that the use of thin interface layers of semiconducting single-walled carbon nanotubes between the perovskite absorber layer and a prototypical hole transport layer improves device efficiency and stability, and reduces hysteresis. |
| Databáze: | OpenAIRE |
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