Publication date: 1st July 2014
Nanoparticles of cadmium selenide (CdSe) and sulfide (CdS) have being showed as good electron acceptors for hybrid solar cells. They can be prepared from aqueous solutions with cadmium, selenium or sulfur sources, sodium citrate as cadmium ion complex agent and an alkaline solution to adjust the pH value. It is observed that the reaction kinetics of CdSe and CdS depend both on the hydroxide source (NH4OH or KOH) and pH values. CdSe precipitated more at lower pH value and CdS, at higher one. These phenomena were carefully used to achieve the formation of core/shell particles of CdSe and CdS in one-step solution process with either of two as core or shell. The appropriate pH values have been selected at each stage of synthesis for each alkaline source. X-ray diffraction patterns, diffuse optical reflectance spectra and scanning electron micrographs of the core/shell products were analyzed. Photovoltaic performance of heterojunctions with core/shell particles and poly(3-hexylthiophene) (P3HT) was studied and compared with that of CdSe- or CdS-P3HT. The hydroxide source used for CdSe and CdS formation influenced on the photovoltaic parameters of the corresponding solar cells. It is concluded that very thin layer or shell of CdS was formed on CdSe core with either of two alkaline sources at pH 10-11. The formation of CdSe shell on CdS core, on the other hand, was possible only in selenium shell solution with pH lower than 9.
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.