Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organic electronics is a continuously growing field and in the last decades it has been recognized that organic semiconductors [1] can have an important role in the fabrication of a wide variety of electronic devices as organic LEDs and FETs, photovoltaic cells and memory elements.
From a theoretical point of view, all these devices require a correct understanding of several aspects: charge injection and transport, energy structure of the organic semiconductors, energy levels alignment at the interface between different materials, the role of trap states, charge recombination and generation.
In particular charge injection in the organic is a critical issue. Organic semiconductors have large band gaps (from 1.5 to 3.0 eV) - they are almost insulators - and low mobility, thus current in organic devices is essentially injection controlled. It is then very important to correctly model contact interfaces especially the formation of trap states that can modify the injection barrier. The effect induced by trap states can become more relevant in devices like solid state sensitized solar cells (ssDSC) [2] where the active layer which absorbs light is fabricated mixing two different materials for electron and hole collection and where the interface is ubiquitous inside the cell. The entire cell is usually modeled using drift-diffusion equations for both electrons and holes in an effective medium framework. By effective medium it is meant that the real structure of the active layer is not explicitly taken into account in the model, and an effective material is used instead [3]. However, the real structure of the electron- and hole-conductor materials is far more complex. Being able to introduce the information about the morphology of the two materials allows to discuss the strengths and limitations of the widely-used effective medium model, but also to describe the transport properties of an ssDSC with unprecedented accuracy.
(Left) the real morphology region with the TiO2 (orange) and the Spiro-OMeTAD (green). (Middle) Hole density current and hole charge density without electron trapped at the interface. (Right) the same as in the middle figure, but when electron trapped at the interface are present.
[1] Brütting W.; (ed.), Physics of Organic Semiconductors. [2] Bach U., et al., Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies. Nature (1995) 395, 583-585. [3] Gagliardi A.; Gentilini D. and Di Carlo A., Charge Transport in Solid-State Dye Sensitized Solar Cells, J. Phys. Chem. C (2012), 116, 23882.
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.