Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.163
Publication date: 23rd September 2021
Developing highly conducting and air-stable n-type semiconductors for organic thermoelectrics have proven challenging, despite intensive research efforts in recent years. Thermoelectric generators convert heat into usable electricity, due to the Seebeck effect. Constructing an efficient thermoelectric generator based on organic semiconductors is difficult, however, primarily due to a significant shortage of suitable organic materials. While organic p-type semiconductors are abundant and relatively easy to dope, there is a shortage of suitable n-type materials and appropriate dopants. One popular approach is to extrinsically dope conjugated polymers. By mixing molecular dopants into a polymer matrix, it is possible to enhance the overall conductivity of the semiconductor to a certain degree, before morphological instabilities take over and cause microscopic phase separation of the dopant and polymer matrix, significantly limiting the doping efficiency.
In this paper, we will present the synthesis of intrinsic organic conductors, based on organometallic coordination polymers. We will discuss in detail how the choice of the ligand is crucial to control the electrical and thermoelectric properties. We will then take a more detailed look at the nature of the metal cation linking the organic ligands, and investigate their influence on charge carrier polarity and magnetic properties. Contrary to extrinsically doped semiconducting polymers, the organometallic coordination polymers exhibit excellent ambient and morphological stability and could pave the way to a new class of robust organic conductors for plastic electronic applications.
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