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Nd:YAG laser ablation characteristics of thin CIGS solar cell films

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Abstract

This work reports that the ablation characteristics of thin CuIn1−x Ga x Se2 (CIGS) solar cell film differ significantly with elemental composition and laser pulse energy. From in situ shadowgraphs measured during Nd:YAG laser (1,064 nm) irradiation of CIGS films and crater morphologies, it was found that strong surface evaporation is dominant for low Ga concentration films of which band gap is well below the photon energy. As the band gap of CIGS film becomes close to or over the laser photon energy due to increased Ga content, surface absorption diminishes and at low laser energy, laser heating of the film plays an important role. It is demonstrated that for the CIGS films with Ga/(Ga + In) ratio being approximately over 0.2, the laser irradiation leads to solid phase removal of the film due to thermomechanical fracture at low laser energy but to ablative evaporation at elevated energy.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MEST) (No. 2011-0029850).

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Authors and Affiliations

  1. School of Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong Buk-gu, Gwangju, 500-712, Republic of Korea

    S. H. Lee, C. K. Kim, J. H. In, D. S. Kim, H. J. Ham & S. H. Jeong

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  1. S. H. Lee
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  2. C. K. Kim
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  3. J. H. In
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  4. D. S. Kim
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Correspondence to S. H. Jeong.

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Lee, S.H., Kim, C.K., In, J.H. et al. Nd:YAG laser ablation characteristics of thin CIGS solar cell films. Appl. Phys. B 113, 403–409 (2013). https://doi.org/10.1007/s00340-013-5477-3

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