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Thermoelectric generators for heat harvesting: From material synthesis to device fabrication

机译：用于热收集的热电发电机：从材料合成到装置制造

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This work reports high performance thermoelectric materials based on an electrochemical deposition method. Ultra-thick (2 mm-thick) and dense electrodeposited thermoelectric films have been successfully synthesized. It is found that at 0.7 at% concentration of nickel doped bismuth telluride, the power factor increases to 2050 mu V/m K-2 which is approximately 3 times higher than that of an electrodeposited pure bismuth telluride film. Meanwhile, the measurement on a thermal conductivity of the nickel doped bismuth telluride shows an improvement, which is nearly 2 times reduction as compared to the pure bismuth telluride film. As a result, a higher ZT value (0.78) of the nickel doped bismuth telluride is more than 5 times better than that of the electrodeposited pure bismuth telluride under similar evaluation conditions. In addition, a highly scalable synthesis process on a 4-inch wafer size of the thermoelectric material-based electrodeposition technique has been demonstrated. It proves that this electrodeposition could open up a chance to develop mass production for the low cost and high performance thermoelectric materials synthesis. Moreover, four kinds of thermoelectric generators (TEGs) including TEGs #1, #2, #3 and #4 with different parameters have been fabricated, evaluated and compared. The metal doped thermoelectric material devices are able to harvest more power than that of the pure thermoelectric material device. The fabricated device is successfully integrated with a DC-DC booster of which output can reach 3 V when a temperature difference of 4 degrees C is applied across the TEG. The generated power can be used to light up an LED from this small temperature difference.
机译：该工作基于电化学沉积方法报告高性能热电材料。已经成功地合成了超厚（2mm厚）和致密的电沉积热电薄膜。结果发现，在0.7at浓度的镍掺杂的碲化铋中，功率因数增加到2050μmV/ m k-2，其比电沉积的纯铋膜高约3倍。同时，与碲化铋膜相比，镍掺杂铋铋的导热率的测量显示出改善，这与纯铋薄膜相比降低了几乎2倍。结果，在类似的评价条件下，镍掺杂铋碲化铋的镍掺杂铋铋的较高Zt值（0.78）比电沉积的纯铋的碲化铋的较好。另外，已经证明了在热电材料的电沉积技术的4英寸晶片尺寸上的高度可扩展的合成过程。它证明，这种电沉积可以开辟出于低成本和高性能热电材料合成的批量生产的机会。此外，已经制造了四种热电发电机（Tegs），包括具有不同参数的TEGS＃1，＃2，＃3和＃4，评估并进行比较。金属掺杂的热电材料装置能够比纯热电材料装置收获更多的功率。制造的装置与DC-DC助力器成功集成，其中输出可以在TEG施加4℃的温度差时达到3V。产生的功率可用于从此较小的温差升高LED。

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