摘要
提高热电PEDOT: PSS薄膜导电性和塞贝克系数的有效方法
作者(年代):健胃徐将废热转化为电能的热电转换作为一种潜在的清洁能源技术备受关注。热电材料的性能是由无因次性能系数(ZT)决定的,它等于σ s2t /κ, κ是热导率,S是塞贝克系数,σ是电导率。σS2代表功率因数。尽管需要低k和高pf才能达到较高的ZT值,但σ和S之间的冲突关系限制了热电材料ZT的进一步调制。导电聚合物有望成为下一代热电材料。它们具有内在的低κ和潜在的高σ,成本效益,大面积加工和易于合成。导电性聚合物作为热电材料已被广泛研究。在所研究的聚合物TE材料中,聚(3,4-乙烯二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)尤其令人感兴趣。它是热稳定的,可水处理,并可以高度导电后处理。有报道称,通过各种后处理方法提高载流子浓度,可以大大提高PEDOT:PSS薄膜的σ。 However, this high doping level results in a small S value because of the extra charge carrier and hence appropriate methods that enhance the S value are required. Moreover, earlier studies have already shown that the power factor could be improved by regulating the redox level through electrochemical or chemical methods optimizing thermoelectric properties through the control of charge carrier concentration. On the other hand, chemicals used in the enhancement of thermoelectric properties are mostly toxic, and its large-scale use should be avoided because of safety and environmental issues. This work will report several chemicals to tune the oxidation level of PEDOT: PSS films and enhance their electrical conductivity, Seebeck coefficient and environmental stability.
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