Using Preformed Meisenheimer Complexes as Dopants for n‐Type Organic Thermoelectrics with High Seebeck Coefficients and Power Factors
Using Preformed Meisenheimer Complexes as Dopants for n‐Type Organic Thermoelectrics with High Seebeck Coefficients and Power Factors
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DOI：
10.1002/adfm.202010567
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发表时间：
2021-02
影响因子：
19
通讯作者：
Jinfeng Han;Connor Ganley;Qin Hu;Xingang Zhao;P. Clancy;T. Russell;H. Katz
中科院分区：
文献类型：
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作者：
Jinfeng Han;Connor Ganley;Qin Hu;Xingang Zhao;P. Clancy;T. Russell;H. Katz
通过将二溴4，9‐dibromo‐2，7‐bis(2‐octyldodecyl)benzo[lmn][3，8]phenanthroline‐1，3，6，8(2H，7H)‐tetraone和四丁基氟化铵混合在溶液中，以一种简单的方法得到了一种预先形成的萘二亚胺与四丁基氟化铵的迈森海默络合物，并将其用作n型有机热电材料的掺杂剂。合成了两种n型聚合物PNDIClTVT和PBDOPVTT，并对它们进行了n掺杂，表征了它们的导电和热电性能。掺入NDI-TBAF的PNDIClTVT的σ值高达0.2 S cm-1，塞贝克系数(S)为1854µV K-1，功率因数(PF)为67µW m-1K-2，是已报道的溶液处理共轭n型聚合物热电材料中最高的功率因数。使用4‐(1，3‐dimethyl‐2，3‐dihydro‐1H‐benzoimidazol‐2‐yl)phenyl)dimethylamine和NDI-TbAF作为共掺杂，PNDIClTVT的pF>；35µW m-1K-2；而对于PbDOPVTT，σ=0.75 S cm-1，pF=58µW m-1K-2。在本研究中发现，离子加合物和中性掺杂一起改善了n型有机热电材料的性能，从而提高了功率因数，更广泛地说，这种加合物在聚合物掺杂中的作用也被阐明了。
A pre‐formed Meisenheimer complex of a naphthalenediimide (NDI) with tetrabutylammonium fluoride (TBAF) is obtained in a simple way by mixing dibrominated 4,9‐dibromo‐2,7‐bis(2‐octyldodecyl)benzo[lmn][3,8]phenanthroline‐1,3,6,8(2H,7H)‐tetraone and TBAF in solution and used as a dopant for n‐type organic thermoelectrics. Two n‐type polymers PNDIClTVT and PBDOPVTT are synthesized, n‐doped, and characterized as conductive and thermoelectric materials. PNDIClTVT doped with NDI‐TBAF presents a high σ value of 0.20 S cm–1, a Seebeck coefficient (S) of −1854 µV K–1, and a power factor (PF) of 67 µW m–1 K–2, among the highest reported PF in solution‐processed conjugated n‐type polymer thermoelectrics. Using 4‐(1,3‐dimethyl‐2,3‐dihydro‐1H‐benzoimidazol‐2‐yl)phenyl)dimethylamine and NDI‐TBAF as co‐dopants, PNDIClTVT has a PF > 35 µW m–1 K–2; while for PBDOPVTT σ = 0.75 S cm–1 and PF = 58 µW m–1 K–2. In this study it is found that an ionic adduct together with a neutral dopant improves the performance of n‐type organic thermoelectrics leading to an enhanced power factor, and more generally, the role of such an adduct in polymer doping is also elucidated.