Conjugated polymers and oligomers provide a unique encompassing set of structurally tunable optical, electronic transport, and redox properties that allows their present and potential use in a host of applications which span, field effect transistors, light emitting diodes, solar cells and photodetectors, electrochromism, along with batteries and supercapacitors. Their properties are controlled by repeat unit, macromolecular, and solid-state structures, all of which are dependent on the chemical identity of each system. In this presentation, we will examine how chemistry enables the creation of new conjugated polymers where a specific property is pushed towards its limit. We will discuss the control of morphology via a combination of structure and processing method (focusing on spray, blade and slot-die coating), and use organic photovoltaic (OPV), electrochromic polymer (ECP), and charge storing supercapacitor platforms for materials characterization. The flexible synthetic chemistry of dioxythiophene-based polymers has allowed us to complete the color palette of vibrantly colored to transmissive, and near infrared, switching electrochromes of any color. By properly controlling the electronic states in DA polymers via introduction of new donors (dithienogermole) and acceptors (isoindigo), in conjunction with fullerene blend morphology and solar cell device architecture, AM1.5 power conversion efficiencies in excess of 8% have been attained.

Conjugated polymers for energy harvesting, storage and modulation

249th National Meeting (2015)

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