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The optical influence of Na on Cu2ZnSnSe4 films deposited with Na-containing sol–gel precursor

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Abstract

A novel Na-containing precursor solution is presented to investigate the sodium influences on Cu2ZnSnSe4 (CZTSe) absorbers grown on Na-free substrates. With higher sodium incorporation, some delicate change in secondary phase Cu2SnSe3 was detected and its influence on the surface valence states was given by X-ray photoelectron spectroscopy analyses. It is found that the band gap significantly increased with nominal addition of Na, while the impurity introduced by excess incorporation would restrain further broadening. This method may probably assist to form a suitable CZTSe film directly on flexible substrates other than soda-lime glass.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (NSFC) (Grant No. 61006010).

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Authors and Affiliations

  1. Key Laboratory of Optoelectronics Materials and Devices, Shanghai Normal University, Shanghai, China

    Yingwei Li, Qifeng Han & Wangzhou Shi

  2. Department of Electronics and Computer Engineering, National Research Laboratory for Nano Quantum Electronics Devices, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

    Tae Whan Kim

Authors
  1. Yingwei Li
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  2. Qifeng Han
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  3. Tae Whan Kim
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  4. Wangzhou Shi
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Correspondence to Qifeng Han.

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Li, Y., Han, Q., Kim, T.W. et al. The optical influence of Na on Cu2ZnSnSe4 films deposited with Na-containing sol–gel precursor. J Sol-Gel Sci Technol 69, 260–265 (2014). https://doi.org/10.1007/s10971-013-3210-7

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  • DOI: https://doi.org/10.1007/s10971-013-3210-7

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