High photon-to-heat conversion efficiency in the wavelength region of 250-1200 nm based on a thermoelectric Bi2Te3 film structure

Er Tao Hu, Yuan Yao, Kai Yan Zang, Xin Xing Liu, An Qing Jiang, Jia Jin Zheng, Ke Han Yu, Wei Wei, Yu Xiang Zheng, Rong Jun Zhang, Song You Wang, Hai Bin Zhao, Osamu Yoshie, Young Pak Lee, Cai Zhuang Wang, David W. Lynch, Jun Peng Guo, Liang Yao Chen

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Abstract

In this work, 4-layered SiO2/Bi2Te3 /SiO2/Cu film structures were designed and fabricated and the optical properties investigated in the wavelength region of 250-1200 nm for their promising applications for direct solar-thermal-electric conversion. A typical 4-layered film sample with the structure SiO2(66.6 nm)/Bi2Te3 (7.0 nm)/SiO2(67.0 nm)/Cu (>100.0 nm) was deposited on a Si or K9-glass substrate by magnetron sputtering. The experimental results agree well with the simulated ones showing an average optical absorption of 96.5%, except in the shorter wavelength region, 250-500 nm, which demonstrates the superior absorption property of the 4-layered film due to the randomly rough surface of the Cu layer resulting from the higher deposition power. The high reflectance of the film structure in the long wavelength region of 2-20 μm will result in a low thermal emittance, 0.064 at 600 K. The simpler 4-layered structure with the thermoelectric Bi2Te3 used as the absorption layer may provide a straightforward way to obtain solar-thermal-electric conversion more efficiently through future study.

Original languageEnglish
Article number44614
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 2017 Mar 16

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    Hu, E. T., Yao, Y., Zang, K. Y., Liu, X. X., Jiang, A. Q., Zheng, J. J., Yu, K. H., Wei, W., Zheng, Y. X., Zhang, R. J., Wang, S. Y., Zhao, H. B., Yoshie, O., Lee, Y. P., Wang, C. Z., Lynch, D. W., Guo, J. P., & Chen, L. Y. (2017). High photon-to-heat conversion efficiency in the wavelength region of 250-1200 nm based on a thermoelectric Bi2Te3 film structure. Scientific Reports, 7, [44614]. https://doi.org/10.1038/srep44614