Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Semiconducting organic materials have attracted increasing interest as thermoelectric (TE) converters in the recent years due to their potentially low fabrication costs and non-toxicity. As in other organic electronic devices, mastering morphology and crystallinity of polymer semiconductors is an essential tool to control the performance of organic TEs. One specific case of morphology, which has a strong impact on the thermoelectric properties of organic TEs, is structural anisotropy. Experimentally anisotropy can be induced by orienting of the polymer backbones using high temperature rubbing or tensile drawing. Such highly oriented conducting polymer films can show considerable increases in the electrical conductivity σ along the direction of orientation, while the influence on the Seebeck coefficient S is less clear.
Here, we use kinetic Monte Carlo (MC) simulations to rationalize the impact of anisotropy on the thermoelectric properties of disordered organic semiconductors. We find that variable-range hopping (VRH) can consistently describe charge and energy transport in both the parallel and the perpendicular direction, which contrasts with the interpretation drawn from experiments on ordered PBTTT [1]. Furthermore, we clarify why some materials show a simultaneous enhancement in conductivity and thermopower in the direction of orientation, while for others the Seebeck coefficient remains largely unaffected. By analyzing the effect of the parameters affecting the length scales and the structural order of the system we demonstrate under which conditions structural anisotropy is a suitable strategy to enhance the power factor of bulk materials beyond values predicted by the empirical power law S∝σ-1/4.
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.