Tuning the optoelectronic properties of dual-acceptor based low-bandgap ambipolar polymers by changing the thiophene-bridge length

Cunbin An,Sreenivasa Reddy Puniredd,Wojciech Pisula,Manfred Wagner,Xin Guo,Martin Baumgarten,Tomasz Marszalek

doi:10.1039/c5py00802f

Abstract

Dual-acceptor polymers based onDPPandTQare prepared with very low bandgaps (0.6–0.9 eV) and ambipolar charge carrier transports.

Highlights

Conjugated polymers with a very low bandgap (≤1.0 eV) have been drawing substantial attention due to their broad and near-infrared (NIR) absorption, multiple redox states in a small potential window, ambipolar charge carrier transport, and potential use in sensors, batteries, and supercapacitors.[1]
Balanced charge carrier transporting polymers are highly desirable for ambipolar OFETs, which allows both p-type and n-type channels to be realized in one device with simple fabrication processes.[11]
The number-average molecular weight (Mn) and polydispersity index (PDI) of the three polymers were determined by the gel permeation chromatography (GPC) method using polystyrene as the standard and tetrahydrofuran as the eluent at 30 °C

Summary

Introduction

Conjugated polymers with a very low bandgap (≤1.0 eV) have been drawing substantial attention due to their broad and near-infrared (NIR) absorption, multiple redox states in a small potential window, ambipolar charge carrier transport, and potential use in sensors, batteries, and supercapacitors.[1]. Tuning the optoelectronic properties of dual-acceptor based low-bandgap ambipolar polymers by changing the thiophene-bridge length† By only inserting one thiophene between DPP and benzodithiophene condensed TQ, the polymer PDPP-T-TQ shows a very low optical bandgap of 0.60 eV with an electron affinity of −4.23 eV.

Results

Conclusion