12 December

On the alignment of macromolecules, polarised photodetectors and condoms

Monday 12 December 2022, 12:00pm

ICMAB-Sala d'Actes Carles Miravitlles, UAB

ICMAB Periodical Lecture

Organised by the ICMAB Seminars and Training Committee 

By Aleksandr Perevedentsev, Molecular Gate S.L., Spin-Off of ICMAB-CSIC 

Abstract: The mere act of aligning an ensemble of polymer chains along a given axis transforms its physical characteristics more dramatically than, arguably, any other post-synthesis approach that one can summon. Consider an oriented polyethylene fiber: an object with the density of water and a tensile strength which is double of steel – and 100-fold higher than the unoriented polymer. It is not surprising, therefore, that Nature calls upon fibrous proteins to assemble the body’s connective and muscle tissues, while synthetic fibers permeate the textile and composites industries. This broad-brush overview will examine the above in the context of molecular electronic materials. How does one align macromolecules in a thin-film format?

How to deal with fibrillar topography for device fabrication? What functionalities are gained by unmasking the intrinsically 1D characteristics of macromolecular semiconductors? These questions will be examined using a case-in-point example of polarised photodetectors based on oriented all-polymer bulk heterojunction active layers. With the community actively seeking performance enhancements derived from advanced processing, molecular alignment is proposed as an elegant means to get more out of your beautiful materials.

Bio: Aleksandr Perevedentsev obtained his PhD Degree in Physics from Imperial College London and the fascination with macromolecules from his postdoctoral stays at ETH Zürich and ICMAB-CSIC. Following a postdoctoral fellowship at the Karlsruhe Institute of Technology, he re-joined ICMAB in 2022 to pursue technology transfer activities in the field of patterned optical security systems. His research interests are centred around materials processing, phase behaviour and spectroscopy.

Hosted by Alejandro Goñi, NANOPTO group, ICMAB-CSIC