Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The development of photovoltaic devices based on organic materials has been at the centre of increasing worldwide efforts in the last years. The motivation for such interest derives from the envisaged prospect of manufacturing light weight, flexible and inexpensive cells. In the quest for higher efficiency, different approaches have been adopted, including the chemical synthesis of low molecular weight or polymeric compounds with tailored properties (frontier orbitals energy, light absorption, charge mobility, etc.) and the optimization of the morphology in phase separated heterojunctions. In addition, in some of the most interesting approaches, the surfaces between the active layer and the electrodes were targeted. The interest in such surfaces arises from the fact that they are the site where several phenomena relevant for the overall device efficiency take place. In spite of the still poor understanding and modellization of such phenomena, efficiency has been improved by inserting “buffer” layers of different thickness and chemical nature, including semiconducting polymers and metal oxides.
We report on the effect on the overall efficiency of a simple surface treatment: rubbing. The sytem taken as a model is the well studied Bulk Heterojunction ITO/PEDOT: PSS/P3HT-PCBM/Al, where the PEDOT:PSS was rubbed with a velvet cloth before the deposition of the BHJ by spin-coating. When the rubbing is neither excessive nor too light, both the short circuit current and the fill factor increase, while the open circuit voltage is constant, as illustrated in the figure, where the number next to the symbols indicates the number of times the PEDOT:PSS surface passed under a rotating cylinder covered with the velvet cloth. Although reproducibility is poor, due to the difficulty in standardizing the rubbing protocol, the efficiency of the rubbed cells increases by an average of 20 % when compared to the non-rubbed controls, and up to 30 % in the best cases. Such observations have been explained in terms of the surface roughness and charging induced by rubbing. The importance of such results lies in the fact that rubbing is ideally suited for roll-to-roll processes.
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.