Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Dye sensitized solar cell (DSSC) [1] is a very promising technology for solar energy due their high efficiency up to 13% [2] and the facility of production. The counter electrode of a DSSC is generally a very thin layer of platinum nanoparticles deposited on FTO through various methods such as screen printing or sputtering. Though Pt is a very efficient catalyst in the reduction of the I3- to I- in standard electrolytes for DSSC, it is a rare and expensive material. In recent years cobalt sulphides have been successfully used as highly catalytic material for counter electrodes with efficiency comparable to that of platinum [3,4]. In this work cobalt sulphide (CoxSy) semi transparent thin films have been deposited on fluorine doped tin oxide glass slide by screen printing (SP), doctor blade (DB) and drop casting using a solution. Cobalt(II) bis diethyl dithiocarbamate has been used as chemical precursor of CoS. The thermal treatment promoting the growth of the films was performed in a vacuum oven in order to avoid any oxidation reaction. Time, temperature and paste composition have been optimized in order to obtain the cathode with the highest reaction rate for the I3- reduction. The electrode performance has been evaluated through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements in order to calculate the functional parameters such as the charge transfer resistance Rct, the double layer capacitance Cdl and the limit current. The thermal degradation of the chemical precursor has been studied by thermo gravimetric analysis (TG) and differential scanning calorimetry (DSC). In order to obtain information about the morphology and the crystallographic phases of the sulphides, X ray diffraction of powder samples and SEM microscopy have been used. All of the electrodes were semitransparent, with a photo-optic transmittance up to 80%.
Impedance spectra of CoS 1 cm2 counter electrodes with commercial HSE electrolyte, the points are represented in the complex plane. Rpt is the charge transfer resistance of platinum.
[1] Grätzel, M.; O’Regean, B. A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films. Nature 1991, 353, 737-739. [2] Mathew, S., Yella, A., Gao, P., Humphry-Baker, R., Curchod, B. F., Ashari-Astani, N., & Grätzel, M. Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers. Nature chemistry 2014. [3] Yang, J., Bao, C., Zhu, K., Tao, Y. U., Li, F., LIU, J. G., & Li, Z. High catalytic activity and stability of the nickel sulfide and cobalt sulfide hierarchical nanospheres on the counter electrodes for dye-sensitized solar cells. Chemical Communications 2014. [4] Wang, M., Anghel, A. M., Marsan, B., Cevey Ha, N. L., Pootrakulchote, N., Zakeeruddin, S. M., & Grätzel, M. CoS supersedes Pt as efficient electrocatalyst for triiodide reduction in dye-sensitized solar cells. Journal of the American Chemical Society 2009, 131(44), 15976-15977.
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.