Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Quantum confined semiconductor nanocrystals called quantum dots (QDs), are promising materials for next-generation photovoltaic technologies and other various optoelectronic applications. Even when the QDs are coupled in arrays through the utilization of recent developments in surface ligand modification, they still exhibit quantum confinement and possess intriguing ensemble properties. We will discuss new synthetic routes that employ cation-exchange reactions to produce well-controlled and stable lead chalcogenide materials. We will discuss treatments of PbSe QD solids with metal chloride salt solutions, with +1 to +3 metals, such as Na+, K+, Zn2+, Cd2+, Sn2+, Cu2+, and In3+. The QD films readily absorb the ions, which influence electronic properties of QD solids and the performance of devices. Furthermore, we will show that metal halide salts (PbI2, PbCl2, CdI2, or CdCl2) dissolved in dimethylformamide efficiently displace the native oleate surface ligands on the QDs, resulting in conductive QD solids. The resulting QD solids have a significant reduction in the carbon content compared to typical QD film treatments using thiols and organic halides. The PbI2 treatment is the most successful in removing alkyl surface ligands and also replaces most surface bound Cl- with I-. The treatment protocol results in PbS QD films exhibiting deeper work function and band positions than other ligand treatments reported previously. The method developed here produces QD solar cells that perform well even at film thicknesses approaching one micron, indicating improved carrier transport in the QD films. Furthermore, these QD synthesis and treatment methods lead to air-stable PbSe QD solar cells. We will present details on QD solids that have enabled the first high-efficiency certified PbSe solar cells and PbSe solar cells that are stable for over 250 days when stored in air as a result of these latest developments.
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.