期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 1, 页码 1110-1119出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17009
关键词
polypyrroles; organic thermoelectric; conductivity; morphology; Seebeck coefficient
资金
- National Research Foundation (NRF) of Korea [NRF -2 0 1 9R1A2 C2 0 8 2 9 0, 2017K2A9A2A12000315, 2019R1A6A1A11044070, NRF-2017R1C1B2010776]
A series of ionically interconnected polypyrrole (PPy) films are fabricated through two-monomer-connected-precursor polymerization by varying diacid linkers, thereby significantly influencing the crystalline morphology and electrical properties. The structure obtained using 1,5-napthalenedisulfonic acid (PPy-Nap) as a fused aromatic linker exhibits a higher electrical conductivity (similar to 78 S cm(-1)) than that (6.7 S cm(-1)) without a linker (PPy-ref). Cryogenic conductivity measurements reveal that the percolation carrier transport barrier of PPy-Nap is significantly smaller than that of PPy-ref, and the calculated carrier mobility of PPy-Nap is similar to 5 times higher compared to PPy-ref. The carrier transport characteristics show a good agreement with morphological data by 2D grazing-incidence X-ray scattering. All PPys have similar doped charge carrier concentrations and, thus, similar Seebeck coefficients (5-8 mu V K-1) but very different electrical conductivities. Consequently, PPy-Nap exhibits a higher power factor than that of PPy-ref (0.21 vs 0.043 mu W m(-1) K-2). The results show that the trade-off relationship between the Seebeck coefficient and electrical conductivity can be overcome by improving crystalline morphology and carrier transport. Thus, both the electrical conductivities and thermoelectric power factors can be improved with maintaining the Seebeck coefficients by enhancing the ordered conductive domains and carrier mobility while maintaining the doping level.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据