S,N-Heteroacene-Based Copolymers for Highly Efficient Organic Field Effect Transistors and Organic Solar Cells: Critical Impact of Aromatic Subunits in the Ladder π-System
Journal
ACS Applied Materials and Interfaces
Journal Volume
10
Journal Issue
7
Pages
6471-6483
Date Issued
2018
Author(s)
Abstract
Three novel donor-acceptor alternating polymers containing ladder-type pentacyclic heteroacenes (PBo, PBi, and PT) are synthesized, characterized, and further applied to organic field effect transistors (OFETs) and polymer solar cells. Significant aspects of quinoidal characters, electrochemical properties, optical absorption, frontier orbitals, backbone coplanarity, molecular orientation, charge carrier mobilities, morphology discrepancies, and the corresponding device performances are notably different with various heteroarenes. PT exhibits a stronger quinoidal mesomeric structure, linear and coplanar conformation, smooth surface morphology, and better bimodal crystalline structures, which is beneficial to extend the π-conjugation and promotes charge transport via 3-D transport pathways and in consequence improves overall device performances. Organic photovoltaics based on the PT polymer achieve a power conversion efficiency of 6.04% along with a high short-circuit current density (JSC) of 14.68 mA cm-2, and a high hole mobility of 0.1 cm2 V-1 s-1 is fulfilled in an OFET, which is superior to those of its counterparts, PBi and PBo. © 2018 American Chemical Society.
SDGs
Other Subjects
Bismuth compounds; Carrier mobility; Electromagnetic wave absorption; Hole mobility; Ladders; Light absorption; Molecular orientation; Optical properties; Organic field effect transistors; Organic polymers; Organic solar cells; Phototransistors; Polymer solar cells; Polymers; Solar cells; Aromatic sub-units; Crystalline structure; Device performance; Heteroacenes; Organic photovoltaics; Power conversion efficiencies; quinoidal; Transport pathways; Field effect transistors
Type
journal article