Lin, Po ShenPo ShenLinLin, Jhih MinJhih MinLinSHIH-HUANG TUNGHigashihara, TomoyaTomoyaHigashiharaCHENG-LIANG LIU2023-11-072023-11-072023-01-0116136810https://scholars.lib.ntu.edu.tw/handle/123456789/636909This study focuses on the fabrication of nanocomposite thermoelectric devices by blending either a naphthalene-diimide (NDI)-based conjugated polymer (NDI-T1 or NDI-T2), or an isoindigo (IID)-based conjugated polymer (IID-T2), with single-walled carbon nanotubes (SWCNTs). This is followed by sequential process doping method with the small molecule 4-(2,3-dihydro-1,3-dimethyl-1H-benzimidazol-2-yl)-N,N-dimethylbenzenamine (N-DMBI) to provide the nanocomposite with n-type thermoelectric properties. Experiments in which the concentrations of the N-DMBI dopant are varied demonstrate the successful conversion of all three polymer/SWCNT nanocomposites from p-type to n-type behavior. Comprehensive spectroscopic, microstructural, and morphological analyses of the pristine polymers and the various N-DMBI-doped polymer/SWCNT nanocomposites are performed in order to gain insights into the effects of various interactions between the polymers and SWCNTs on the doping outcomes. Among the obtained nanocomposites, the NDI-T1/SWCNT exhibits the highest n-type Seebeck coefficient and power factor of −57.7 µV K−1 and 240.6 µW m−1 K−2, respectively. However, because the undoped NDI-T2/SWCNT exhibits a slightly higher p-type performance, an integral p–n thermoelectric generator is fabricated using the doped and undoped NDI-T2/SWCNT nanocomposite. This device is shown to provide an output power of 27.2 nW at a temperature difference of 20 K.encarbon nanotubes | conjugated polymers | n-type doping | nanocomposites | thermoelectricjournal article10.1002/smll.202306166378478952-s2.0-85174254384https://api.elsevier.com/content/abstract/scopus_id/85174254384