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A Chemically Doped Naphthalenediimide‐Bithiazole Polymer for n‐Type Organic Thermoelectrics
Author(s) -
Wang Suhao,
Sun Hengda,
Erdmann Tim,
Wang Gang,
Fazzi Daniele,
Lappan Uwe,
Puttisong Yuttapoom,
Chen Zhihua,
Berggren Magnus,
Crispin Xavier,
Kiriy Anton,
Voit Brigitte,
Marks Tobin J.,
Fabiano Simone,
Facchetti Antonio
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201801898
Subject(s) - materials science , stacking , polymer , acceptor , thermoelectric effect , doping , steric effects , electron acceptor , seebeck coefficient , crystallography , thermoelectric materials , electrical resistivity and conductivity , optoelectronics , stereochemistry , condensed matter physics , organic chemistry , composite material , chemistry , thermal conductivity , thermodynamics , physics , engineering , electrical engineering
The synthesis of a novel naphthalenediimide (NDI)‐bithiazole (Tz2)‐based polymer [P(NDI2OD‐Tz2)] is reported, and structural, thin‐film morphological, as well as charge transport and thermoelectric properties are compared to the parent and widely investigated NDI‐bithiophene (T2) polymer [P(NDI2OD‐T2)]. Since the steric repulsions in Tz2 are far lower than in T2, P(NDI2OD‐Tz2) exhibits a more planar and rigid backbone, enhancing π–π chain stacking and intermolecular interactions. In addition, the electron‐deficient nature of Tz2 enhances the polymer electron affinity, thus reducing the polymer donor–acceptor character. When n‐doped with amines, P(NDI2OD‐Tz2) achieves electrical conductivity (≈0.1 S cm −1 ) and a power factor (1.5 µW m −1 K −2 ) far greater than those of P(NDI2OD‐T2) (0.003 S cm −1 and 0.012 µW m −1 K −2 , respectively). These results demonstrate that planarized NDI‐based polymers with reduced donor–acceptor character can achieve substantial electrical conductivity and thermoelectric response.