One-Step Deposition of Photovoltaic Layers Using Iodide Terminated PbS Quantum Dots
| Autor: | Heonseok Ha, Matthew C. Beard, Jung Hoon Song, Sohee Jeong, Hyung Cheoul Shim, Hyekyoung Choi, Sungwoo Kim, Ji-Hoon Jang, Noh Jaehong |
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| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Chemistry Iodide technology industry and agriculture Nanotechnology Ammonium iodide chemistry.chemical_compound Chemical engineering X-ray photoelectron spectroscopy Quantum dot Transmission electron microscopy General Materials Science Physical and Theoretical Chemistry Layer (electronics) Alkyl |
| Zdroj: | The Journal of Physical Chemistry Letters. 5:4002-4007 |
| ISSN: | 1948-7185 |
| Popis: | We present a one-step layer deposition procedure employing ammonium iodide (NH4I) to achieve photovoltaic quality PbS quantum dot (QD) layers. Ammonium iodide is used to replace the long alkyl organic native ligands binding to the QD surface resulting in iodide terminated QDs that are stabilized in polar solvents such as N,N-dimethylformamide without particle aggregation. We extensively characterized the iodide terminated PbS QD via UV-vis absorption, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), FT-IR transmission spectroscopy, and X-ray photoelectron spectroscopy (XPS). Finally, we fabricated PbS QD photovoltaic cells that employ the iodide terminated PbS QDs. The resulting QD-PV devices achieved a best power conversion efficiency of 2.36% under ambient conditions that is limited by the layer thickness. The PV characteristics compare favorably to similar devices that were prepared using the standard layer-by-layer ethandithiol (EDT) treatment that had a similar layer thickness. |
| Databáze: | OpenAIRE |
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