New Thermoelectric Material and Devices: Naphthol[1,3]oxazine and the Performance Compared with Bismuth Telluride

Herein, we have developed a state-of-the-art approach toward an organic thermoelectric (OTE) device by synthesizing oxazine monomers 2-phenyl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine (MNA) and 2-(furan-2-ylmethyl)-2,3-dihydro-1H-naphthol[1,2-e][1,3]oxazine (MNF) which were further developed into their ring-opening polymers (PNA and PNF) and found to exhibit the same carrier charges as that of their corresponding monomers. The synthesized organic monomer and polymers have shown significant influence through fabrication to the thermoelectric device by a parallel leg made of synthesized PANi-FeCl3/PAN p-type and n-type doped bismuth telluride (Bi2Te3) composites and produced the attracting thermoelectric output. The striking hint is that the monomer shows high resistivity and low mobility. In contrast, after the ring-opening polymerization, it demands the attractive notice of the poly naphthoxazine for thermoelectric studies. This novel approach ensures the route to produce a substantial average Seebeck coefficient of 646.70 μV K–1 and power factor 10 × 105 W m–1 K–2 and it was revealed that polymer PNA had a greater affinity toward OTE. Further, the p-type and n-type device fabrication of the monomer and the polymer was made using the p-type and n-type doped Bi2Te3, where the p-type PNA shows the highest output of 5.6 mV with PANi-FeCl3/PAN n-type doped Bi2Te3.