Salah Numan, Baghdadi Neazar, Abdullahi Shittu, Alshahrie Ahmed, Koumoto Kunihito
Center of Nanotechnology, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
K. A. CARE Energy Research and Innovation Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Nanomaterials (Basel). 2023 Feb 20;13(4):781. doi: 10.3390/nano13040781.
Recently, the n-type TiS/organic hybrid superlattice (TOS) was found to have efficient thermoelectric (TE) properties above and near room temperature (RT). However, its TE performance and power generation at the temperature gradient below RT have not yet been reported. In this work, the TE performance and power generation of the TOS above and below RT were investigated. The electrical conductivity () and Seebeck coefficient () were recorded as a function of temperature within the range 233-323 K. The generated power at temperature gradients above (at ΔT = 20 and 40 K) and below (at ΔT = -20 and -40 K) RT was measured. The recorded decreased by heating the TOS, while | increased. The resulting power factor recorded ~100 µW/mK at T = 233 K with a slight increase following heating. The charge carrier density and Hall mobility of the TOS showed opposite trends. The first factor significantly decreased after heating, while the second one increased. The TE-generated power of a single small module made of the TOS at ΔT = 20 and 40 K recorded 10 and 45 nW, respectively. Surprisingly, the generated power below RT is several times higher than that generated above RT. It reached 140 and 350 nW at ΔT = -20 and -40 K, respectively. These remarkable results indicate that TOS might be appropriate for generating TE power in cold environments below RT. Similar TE performances were recorded from both TOS films deposited on solid glass and flexible polymer, indicating TOS pertinence for flexible TE devices.
最近，人们发现n型TiS/有机混合超晶格（TOS）在室温及室温附近具有高效的热电（TE）性能。然而，其在低于室温的温度梯度下的TE性能和发电情况尚未见报道。在这项工作中，对TOS在室温以上和以下的TE性能及发电情况进行了研究。在233 - 323 K范围内记录了电导率（）和塞贝克系数（）随温度的变化。测量了在高于室温（ΔT = 20和40 K）和低于室温（ΔT = -20和 -40 K）的温度梯度下产生的功率。记录的随着TOS加热而降低，而|增加。在T = 233 K时测得的功率因数约为100 μW/mK，加热后略有增加。TOS的电荷载流子密度和霍尔迁移率呈现相反的趋势。第一个因素在加热后显著降低，而第二个因素增加。由TOS制成的单个小模块在ΔT = 20和40 K时的TE发电功率分别记录为10和45 nW。令人惊讶的是，低于室温时产生的功率比高于室温时产生的功率高出几倍。在ΔT = -20和 -40 K时分别达到140和350 nW。这些显著结果表明，TOS可能适用于在低于室温的寒冷环境中产生TE功率。在沉积在固体玻璃和柔性聚合物上的TOS薄膜中都记录到了类似的TE性能，表明TOS适用于柔性TE器件。
