Publication date: 15th December 2025
Doped polymer semi-conductors are promising materials in organic electronics in general and for thermoelectric and organic electrochemical transistor applications in particular. The processing of the polymer semi-conductors determines their structure and hence the way dopant molecules will be incorporated in the polymer matrix. Specifically, polymorphism is often encountered in poly(thiophenes) and determines for instance the packing of side chains (interdigitated, disordered, etc…). [1] The control of side-chain packing is of paramount importance to control dopant molecule location in the polymer semiconductor hence the charge transport properties. Herein, we investigate the impact of polymorphism of a family of PBTTT polymers on doping and the resulting thermoelectric properties in oriented thin films. We consider PBTTTs with different side chains including oligo(ethylene glycol), siloxane or alkyl side chains with some ether function. [2-6] Interestingly, by combining TEM, FTIR and polarized UV-vis-NIR spectroscopy, it is possible to uncover a correlation between the initial side chain conformation and the doping efficiency that finally impacts thermoelectric properties and corresponding stability of the doped and oriented thin films.
This work was financially supported by the European Commission through the Marie Sklodowska-Curie project HORATES (GA-955837). We thank the French national research agency (ANR) for funding through contract Thermopolys (ANR-22-CE50-0020) and Tripode (ANR-23-CE06-0032). Support and technical assistance from the TEM platform at ICS (M. Schmutz), for AFM measurements (C. Contal) and for high temperature rubbing (L. Herrmann) is gratefully acknowledged.
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.