Abstract
The presented study describes the method for the synthesis and characterization of a new class of conjugated copolymers containing a perylenediimide (PDI) and naphthalene diimide (NDI) side groups. The main conjugated backbone is a donor-acceptor polymer poly[3,6-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] containing thiophene and carbazole as donor units and benzothiadiazole as an acceptor unit. The presented compounds were synthesized in a multistep synthesis. The polymerization was carried out by Suzuki or Stille coupling reaction. Redox properties of the studied polymers were tested in different conditions. Electrochemical investigation revealed independent reduction of the main polymer chain and diimide side groups. UV-Vis spectroscopy revealed the overlap of two absorption spectra. The difference between the electron affinity of the polymer main chain and that of the diimides estimated electrochemically is approximately 0.3 eV.
Highlights
One of the best perspective research fields of π-conjugated polymers is organic photovoltaics (OPV) [1]
The typical photoactive blend layer in bulk heterojunction (BHJ) OPV cells consist of conjugated polymer donor and fullerene derivative as molecular acceptor [5]
Recent years bring the intense development of a new class of BHJ solar cells with nonfullerene acceptor molecules [5]
Summary
One of the best perspective research fields of π-conjugated polymers is organic photovoltaics (OPV) [1]. The operation of solar cells is possible through photogeneration of charge carriers in a semiconductor material, and their consecutive separation and transport to the respective electrodes through the active layer [2,3,4]. Organic solar cells utilized primarily bilayer architectures, whereas currently bulk heterojunction (BHJ) devices have become preeminent among these devices. The BHJ requires donor and acceptor types of organic semiconductors to be combined. Small molecules, conjugated oligomers, or polymers can be used. The typical photoactive blend layer in BHJ OPV cells consist of conjugated polymer donor and fullerene derivative as molecular acceptor [5]. Recent years bring the intense development of a new class of BHJ solar cells with nonfullerene acceptor molecules [5].
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