Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.101
Publication date: 23rd September 2021
X. Rodríguez-Martínez1, F. Saiz1, S. Marina2, H. Chen3, O. Zapata-Arteaga1, B. Dorling1, J. Martin2,4,5, I. McCulloch3,6, R. Rurali1, J. S. Reparaz1, M. Campoy-Quiles1,*
1 Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193, Bellaterra, Spain
2 POLYMAT and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Manuel de Lardizabal 3, 20018, Donostia- San Sebastián, Spain
3 King Abdullah University of Science and Technology (KAUST) Solar Center (KSC), Thuwal, 23955-6900, Saudi Arabia
4 Ikerbasque, Basque Foundation for Science, 48011 Bilbao, Spain
5 Centro de Investigacións Tecnolóxicas, Universidade da Coruña, Campus de Esteiro, 15403, Ferrol, Spain
6 Department of Chemistry, University of Oxford, Oxford, OX1 3TA, United Kingdom
The thermal conductivity is the main parameter defining how heat propagates in a solid. It is of paramount importance for heat dissipation in electronics and transmission lines, but also in thermoelectrics. Despite its importance, little attention has been paid to its actual value, in part due to the general belief that the thermal conductivity in organic semiconductors “should be” small. Literature shows, however, values spanning more than two orders of magnitude.
In this invited talk, we will show a combined experimental/theoretical study, in which we have measured the thermal conductivity for a large polymer library and discovered the coexistence of two fundamentally distinct regimes. Semicrystalline conjugated polymers behave as conventional theory predicts, with increasing order leading to an increase in thermal conductivity, and this correlates also with an increase in charge carrier mobility. In other words, thermal and electrical transport go hand in hand. On the other hand, materials that do not show long range order in GIWAXS behave very differently, not following the same classic theory. As a consequence, for the latter, charge carrier mobility and thermal conductivity appear to be anticorrelated. We rationalize our results using Spearman statistics as well as theoretical calculations, which allow us to provide simple and exploitable design rules for materials that are able to decouple thermal and electronic transport, namely, texture/orientation and monomer/sidechain weight. Our results open a new avenue for highly efficient organic thermoelectrics.
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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.
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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.
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