期刊
NANOSCALE
卷 7, 期 41, 页码 17338-17342出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr04907e
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资金
- Swiss National Science Foundation [200021-147143]
- European Commission (EC) FP7 ITN MOLESCO project [606728]
- UK EPSRC [EP/K001507/1, EP/J014753/1, EP/H035818/1]
- Iraqi Ministry of Higher Education, Tikrit University [SL-20]
- Tikrit University
- Engineering and Physical Sciences Research Council [EP/M014452/1, EP/H035818/1, EP/K001507/1, EP/J014753/1] Funding Source: researchfish
- EPSRC [EP/K001507/1, EP/J014753/1, EP/M014452/1] Funding Source: UKRI
We investigate strategies for increasing the thermopower of crown-ether-bridged anthraquinones. The novel design feature of these molecules is the presence of either (1) crown-ether or (2) diaza-crown-ether bridges attached to the side of the current-carrying anthraquinone wire. The crown-ether side groups selectively bind alkali-metal cations and when combined with TCNE or TTF dopants, provide a large phase-space for optimising thermoelectric properties. We find that the optimum combination of cations and dopants depends on the temperature range of interest. The thermopowers of both 1 and 2 are negative and at room temperature are optimised by binding with TTF alone, achieving thermpowers of -600 mu V K-1 and -285 mu V K-1 respectively. At much lower temperatures, which are relevant to cascade coolers, we find that for 1, a combination of TTF and Na+ yields a maximum thermopower of -710 mu V K-1 at 70 K, whereas a combination of TTF and Li+ yields a maximum thermopower of -600 mu V K-1 at 90 K. For 2, we find that TTF doping yields a maximum thermopower of -800 mu VK-1 at 90 K, whereas at 50 K, the largest thermopower (of -600 mu V K-1) is obtain by a combination TTF and K+ doping. At room temperature, we obtain power factors of 73 mu W m(-1) K-2 for 1 (in combination with TTF and Na+) and 90 mu W m(-1) K-2 for 2 (with TTF). These are higher or comparable with reported power factors of other organic materials.
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