极化子
佩多:嘘
材料科学
热电效应
塞贝克系数
兴奋剂
掺杂剂
电导率
导电聚合物
电阻率和电导率
光电子学
凝聚态物理
聚合物
物理化学
热力学
热导率
复合材料
化学
物理
电子
量子力学
作者
Jiajia Zhang,Caichao Ye,Genwang Wei,Liang Guo,Yuhang Cai,Zhi Liu,Xinzhi Wu,Fan Sun,Qikai Li,Yupeng Wang,Huan Li,Yuchen Li,Shuaihua Wang,Wei Xu,Xuefeng Guo,Wenqing Zhang,Weishu Liu
摘要
Abstract Enhancing the thermoelectric (TE) transport properties of conductive polymer materials has been a long-term challenge, in spite of the success seen with molecular doping strategies [1–8]. However, the strong coupling between the thermopower and the electrical conductivity limits the thermoelectric performance. Here, we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS (poly(3,4-ethylenedioxythiophene-poly(4-styrenesulfonate)) thin film by using photochromic diarylethene (DAE) dopants coupled with UV-light modulation. With a 10-fold enhancement of the thermopower from 13.5 μV K−1 to 135.4 μV K−1 and almost unchanged electrical conductivity, the DAE-doped PEDOT: PSS thin film achieved an extremely high power factor of 521.28 μW m−1 K−2 from an original value of 6.78 μW m−1 K−2. The thermopower was positively correlated with the UV light intensity but decreased with increasing temperature, indicating resonant coupling between the planar closed DAE molecule and PEDOT. Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film.
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