Thermoelectric Properties of Poly(3-hexylthiophene) (P3HT) Doped with 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) by Vapor-Phase Infiltration
Thermoelectric Properties of Poly(3-hexylthiophene) (P3HT) Doped with 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) by Vapor-Phase Infiltration
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DOI：
10.1021/acs.chemmater.7b04849
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发表时间：
2018-02-13
影响因子：
8.6
通讯作者：
Chabinyc, Michael L.
中科院分区：
文献类型：
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作者：
Lim, Eunhee;Peterson, Kelly A.;Chabinyc, Michael L.
半导体聚合物薄膜的掺杂可以控制其电导率和热电势。半导体聚合物的电导率随着载流子浓度非线性上升，并且对导致这种行为的详细因素缺乏了解。我们报告了掺杂对掺杂小分子 2,3,5,6-四氟-7,7,8,8-四氰基醌二甲烷 (F(4)TCNQ) 的聚 (3-己基噻吩) (P3HT) 薄膜电导率的形态影响的研究。共振软X射线散射表明，F(4)TCNQ从气相渗透并没有强烈改变P3HT薄膜的形貌。我们表明，P3HT 的局部有序性、微晶的纹理和形状因子以及晶域的长程连通性都有助于薄膜的导电性。气相掺杂F(4)TCNQ的P3HT薄膜的热电势相对于溶液掺杂的薄膜而言并没有明显增强，但电导率明显更高，从而提高了热电功率因数。
Doping of thin films of semiconducting polymers provides control of their electrical conductivity and thermopower. The electrical conductivity of semiconducting polymers rises nonlinearly with the carrier concentration, and there is a lack of understanding of the detailed factors that lead to this behavior. We report a study of the morphological effects of doping on the electrical conductivity of poly(3-hexylthiophene) (P3HT) thin films doped with small molecule 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)TCNQ). Resonant soft X-ray scattering shows that the morphology of films of P3HT is not strongly changed by infiltration of F(4)TCNQ from the vapor phase. We show that the local ordering of P3HT, the texture and form factor of crystallites, and the long-range connectivity of crystalline domains contribute to the electrical conductivity in thin films. The thermopower of films of P3HT doped with F(4)TCNQ from the vapor phase is not strongly enhanced relative to films doped from solution, but the electrical conductivity is significantly higher, improving the thermoelectric power factor.