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Supercritical synthesis and in situ deposition of PbS nanocrystals with oleic acid passivation for quantum dot solar cells

Tavakoli, M. M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchemphys.2015.02.043
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. Colloidal quantum dot solar cells have recently attracted significant attention due to their low-processing cost and surging photovoltaic performance. In this paper, a novel, reproducible, and simple solution-based process based on supercritical fluid toluene is presented for in situ growth and deposition PbS nanocrystals with oleic-acid passivation. A lead precursor containing sulfur was mixed with oleic acid in toluene and processed in a supercritical fluid condition at different temperatures of 140, 270 and 330 °C for 20 min. The quantum dots were deposited on a fluorine-doped tin oxide glass substrate inside the supercritical reactor. Transmission electron microscopy, X-ray diffraction, absorption and dynamic light scattering showed that the nanocrystals processed at the supercritical condition (330 °C) are fully crystalline with a narrow size distribution of ∼3 nm with an absorption wavelength of 915 nm (bandgap of 1.3 eV). Fourier transform infrared spectroscopy indicated that the PbS quantum dots are passivated by oleic acid molecules during the growth. Photovoltaic characteristics of Schottky junction solar cells showed an improvement over devices prepared by spin-coating
  6. Keywords:
  7. Chemical synthesis ; Chalcogenides ; Chemical compounds ; Deposition ; Effluent treatment ; Fourier transform infrared spectroscopy ; Inorganic compounds ; Light scattering ; Nanocomposites ; Nanocrystals ; Nanostructured materials ; Oleic acid ; Passivation ; Semiconducting lead compounds ; Solar cells ; Solar power generation ; Substrates ; Supercritical fluids ; Synthesis (chemical) ; Tin oxides ; Toluene ; Transmission electron microscopy ; X ray diffraction ; Colloidal quantum dots ; Electronic materials ; Fluorine doped tin oxide ; Narrow size distributions ; Photovoltaic characteristics ; Photovoltaic performance ; Quantum dot solar cells ; Supercritical condition ; Semiconductor quantum dots
  8. Source: Materials Chemistry and Physics ; Volume 156 , 2015 , Pages 163-169 ; 02540584 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0254058415001388