3 years ago

Manipulating Band Structure through Reconstruction of Binary Metal Sulfide towards High-Performance, Eco-Friendly and Cost-Efficient Thermoelectrics in Nanostructured Bi13S18I2

Matthias T. Agne, Tianli Feng, Je-Hyeong Bahk, Biao Xu, Lin Zhou, Kazuki Imasato, Qing Tan, Xiulin Ruan, G. Jefferey Snyder, Yue Wu, Zhe Li
Dismantling and reconstructing canonical binary compounds by inserting a third agent can significantly modify their electronic and phonon structures. Therefore, it has inspired the semiconductor communities in various fields, such as electronic devices, radiation detectors and solar cells. Introducing this paradigm will potentially revolutionize thermoelectrics as well, which has been largely relying on simple binary compounds for decades. Here via a solution synthesis, we rebuild the eco-friendly and non-expensive Bi2S3 by adding disordered Bi and weakly bonded I. Theoretical studies indicate that these new structural motifs and the altered crystal symmetry induce prominent changes in electrical and thermal transport, resulting in a great enhancement of figure of merit. The as-obtained nanostructured Bi13S18I2 represents the first non-toxic, cost-efficient and solution-processable n-type thermoelectric material with zT = 1.0.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201713223

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