Publication date: 1st April 2013
This work describes electrophoretic deposition of PbS nanocrystals, synthesized by a standard organometallic method[1], onto the surface of TiO2 nanotube substrate as well as their characterization with microscopic and spectroscopic methods. The substrate was prepared by a standard anodic oxidation of a Ti metal thin film, sputtered onto the surface of transparent conducting oxide, in viscous F- containing electrolyte as described elsewhere[2]. The size of NPs was established with a help of HR-TEM (Fig. 1) and laser beam dynamic light scattering technique. The well dispersed PbS NPs were capped with oleic acid ligand and were confirmed to have non-zero zeta potential. Their deposition onto TiO2 surface was performed via electrophoresis from a toluene suspension. A femtosecond transient absorption spectroscopy was used to characterize a charge injection from excited state of PbS NPs into conduction band of TiO2. A sample was excited by a laser at 420 nm and probed at 600 nm. Two components in the kinetics of decay of main excited state could be distinguished for PbS/TNT system: fast τ2 and slow τ1, whereas only one component can be seen for pure PbS NPs in toluene solution. This suggests that a fast electron injection (charge transfer) from a dominant excited state of PbS NPs is occurring on a tens of ps timescale.
Acknowledgements:
This work was partially supported by Polish National Science Centre (grant DEC-2011/03/N/ST5/04715).
HR-TEM image of PbS nanoparticle on the surface of TiO2 nanotube
[1]Hines, M.A.; Scholes, G. D. Colloidal PbS Nanocrystals with Size-Tunable Near-Infrared Emission: Observation of Post-Synthesis Self-Narrowing of Particle Size Distribution. Adv. Mater. 2003, 15, 1844-1849. [2]Kuzmych, O.; Nonomura, K.;Johansson, E. M. J.; Nyberg, T.; Hagfeldt, A.; Skompska, M. Defect Minimization and Morphology Optimization in TiO2 Nanotube thin Films, grown on transparent conducting Substrate, for Dye Synthesized solar Cell Application. Thin Solid Films 2012, 522, 71-78.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.