A Universal, Highly Stable Dopant System for Organic Semiconductors Based on Lewis-Paired Dopant Complexes

Overview

Journal ACS Energy Lett

Publisher American Chemical Society

Date 2024 Jul 18

PMID 39022671

Authors

Osnat Zapata-Arteaga

Aleksandr Perevedentsev

Michela Prete

Stephan Busato

Paolo Sebastiano Floris

Jesika Asatryan

Riccardo Rurali

Jaime Martin

Mariano Campoy-Quiles

Affiliations

Soon will be listed here.

Abstract

Chemical doping of organic semiconductors is an essential enabler for applications in electronic and energy-conversion devices such as thermoelectrics. Here, Lewis-paired complexes are advanced as high-performance dopants that address all the principal drawbacks of conventional dopants in terms of limited electrical conductivity, thermal stability, and generality. The study focuses on the Lewis acid B(CF) (BCF) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (FTCNQ) bearing Lewis-basic -CN groups. Due to its high electron affinity, BCF:FTCNQ dopes an exceptionally wide range of organic semiconductors, over 20 of which are investigated. Complex activation and microstructure control lead to conductivities for poly(3-hexylthiophene) (P3HT) exceeding 300 and 900 S cm for isotropic and chain-oriented films, respectively, resulting in a 10 to 50 times larger thermoelectric power factor compared to those obtained with neat dopants. Moreover, BCF:FTCNQ-doped P3HT exhibits a 3-fold higher thermal dedoping activation energy compared to that obtained with neat dopants and at least a factor of 10 better operational stability.

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