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Thermoelectric figure of merit enhancement in a quantum dot superlattice

机译：量子点超晶格中的热电品质因数增强

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摘要

We theoretically investigated electron and phonon transport in a quantum superlattice and evaluated a possible thermoelectric figure of merit increase. The presented model takes into account electron and phonon transport modifications due to the space confinement caused by the mismatch in electronic and thermal properties between dot and host materials. The numerical calculations were carried out for a structure that consists of multiple layers of Si with regimented quantum dots separated by wetting layers and spacers. Transport coefficients (electric conductivity, Seebeck coefficient and lattice thermal conductivity) were calculated as functions of quantum dot volume fraction for different dot sizes. It is shown that additional thermoelectric figure of merit enhancement due to the presence of quantum dots may be obtained. The predicted enhancement is mostly due to the significant drop in the lattice thermal conductivity caused by the acoustic phonon scattering by quantum dots.
机译：我们从理论上研究了量子超晶格中的电子和声子传输，并评估了可能增加的热电品质因数。提出的模型考虑了由于点和主体材料之间的电子和热学性质不匹配而引起的空间限制引起的电子和声子传输的修正。对由多层Si组成的结构进行了数值计算，该Si层具有通过润湿层和隔离层分隔的控制量子点。计算了不同点尺寸的传输系数（电导率，塞贝克系数和晶格热导率）作为量子点体积分数的函数。结果表明，由于存在量子点，可以获得额外的热电品质因数提高。预测的增强主要是由于声子被量子点散射引起的晶格热导率显着下降。

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