December 1 - 6, 2024
Boston, Massachusetts
Symposium Supporters
2024 MRS Fall Meeting & Exhibit
CH03.09.05

Linking Electronic and Structural Disorder Parameters to Carrier Transport in a Modern Conjugated Polymer

When and Where

Dec 6, 2024
11:00am - 11:15am
Hynes, Level 3, Room 300

Presenter(s)

Co-Author(s)

Aram Amassian1,Gaurab Thapa1,Mihirsinh Chauhan1,Rosemary Cranston2,Boyu Guo1,Benoit Lessard2,Daniel Dougherty1

North Carolina State University1,University of Ottawa2

Abstract

Aram Amassian1,Gaurab Thapa1,Mihirsinh Chauhan1,Rosemary Cranston2,Boyu Guo1,Benoit Lessard2,Daniel Dougherty1

North Carolina State University1,University of Ottawa2
Understanding charge transport in conjugated polymers is crucial for the development of next-generation organic electronic applications. It is presumed that structural disorder in conjugated polymers originating from their semi-crystallinity, processing, or polymorphism leads to a complex energetic landscape that influences charge carrier transport properties. However, the link between polymer order parameters and energetic landscape is not well established experimentally. In this work, we successfully link statistical surveys of local polymer electronic structure with paracrystalline structural disorder, a measure of statistical fluctuations away from the ideal polymer packing structure. We use scanning tunneling microscopy/spectroscopy to measure spatial variability in electronic band edges in PM6 films, a high-performance conjugated polymer, and find that films with higher paracrystallinity exhibit greater electronic disorder. In addition, we show macroscopic charge carrier mobility in field effect transistors and hole-only diode devices are positively correlated with these microscopic structural and electronic parameters.

Keywords

electronic structure | polymer | scanning tunneling microscopy (STM)

Symposium Organizers

Philippe Leclere, University of Mons
Malgorzata Lekka, Inst of Nuclear Physics PAN
Gustavo Luengo, L'OREAL Research and Innovation
Igor Sokolov, Tufts University

Symposium Support

Gold
Bruker

Session Chairs

Philippe Leclere
Malgorzata Lekka

In this Session