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Variable Light Soaking Effect of Cu(In,Ga)Se2 Solar Cells with Conduction Band Offset Control of Window/Cu(In,Ga)Se2 Layers

  • Takashi Minemoto (a1), Yasuhiro Hashimoto (a2), Takuya Satoh (a3), Takayuki Negami (a4) and Hideyuki Takakura (a5)...

Abstract

The impact of the conduction band offset (CBO) between window/Cu(In,Ga)Se2 (CIGS) layers on the light soaking (LS) effect in CIGS solar cells has been studied with continuous CBO control using a (Zn,Mg)O (ZMO) window layer. Two types of CIGS solar cells with different window/buffer/absorber layers configurations were fabricated, i.e., ZMO/CIGS (without buffer layer) and ZMO/CdS/CIGS structures. The CBO values between ZMO and CIGS layers were controlled to -0.15~0.25 eV. Plus and minus signs of CBO indicate the conduction band minimums of ZMO above and below that of CIGS, respectively. Current-voltage (J-V) characteristics of the solar cells with different LS durations revealed that a positive CBO value higher than 0.16 eV induces J-V curve distortion, i.e., LS effect, and all the J-V characteristics stabilized in 30 min. The degrees of the LS effect were dominated by the CBO value between ZMO and CIGS layers in the both structure regardless of the existence of CdS buffer layers. These results indicate that the LS effect is dominated by the highest barrier for photo-generated electrons in the conduction band diagram, i.e., the CBO between ZMO and CIGS layers, and quantitatively the LS effect emerges the CBO value higher than 0.16 eV.

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1. Contreras, M.A., Ramanathan, K., AbuShama, J., Hasoon, F., Young, D.L., Egaas, B. and Noufi, R., Prog. Photovolt: Res. Appl. 13, 209216 (2005).
2. Burgelman, M., Engelhardt, F., Guillemoles, J.F., Herberholz, R., Igalson, M., Klenk, R., Lampert, M., Meyer, T., Nadenau, V., Niemegeers, A., Parisi, J., Rau, U., Schock, H.W., Schmitt, M., Seifert, O., Walter, T. and Zott, S., Prog. Photovolt: Res. Appl. 5, 121130 (1997).
3. Eisgruber, I.L., Granata, J.E., Sites, J.R., Hou, J. and Kessler, J., Sol. Energy Mater. Sol. Cells 53, 367377 (1998).
4. Nakada, T., Mizutani, M., Hagiwara, Y. and Kunioka, A., Sol. Energy Mater. Sol. Cells 67, 255260 (2001).
5. Pudov, A.O., Sites, J.R., Contreras, M.A., Nakada, T. and Schock, H.-W., Thin Solid Films 480-481, 273278 (2005).
6. Tokita, Y., Chaisitsak, S., Yamada, A., Konagai, M., Sol. Energy Mater. Sol. Cells 75, 915 (2003).
7. Minemoto, T., Negami, T., Nishiwaki, S., Takakura, H. and Hamakawa, Y., Thin Solid Films 372, 173176 (2000).
8. Minemoto, T., Matsui, T., Takakura, H., Hamakawa, Y.,Negami, T., Hashimoto, Y., Uenoyama, T. and Kitagawa, M., Sol. Energy Mater. Sol. Cells 67, 8388 (2001).
9. Minemoto, T., Hashimoto, Y., Satoh, T., Negami, T., Takakura, H., Hamakawa, Y., J. Appl. Phys. 89, 83278330 (2001).
10. Minemoto, T., Hashimoto, Y., Satoh, T., Kolahi, W.S., Negami, T., Takakura, H. and Hamakawa, Y., Sol. Energy Mater. Sol. Cells 75, 121126 (2003).
11. Minemoto, T., Takakura, H., Hamakawa, Y., Hashimoto, Y., Nishiwaki, S. and Negami, T., Proceedings of 16th European Photovoltaic Solar Energy Conference, London, 2001, pp. 686689.
12. Negami, T., Satoh, T., Hashimoto, Y., Nishiwaki, S., Shimakawa, S. and Hayashi, S., Technical Digest of the Eleventh International Photovoltaic Science and Engineering Conference, Hokkaido, 1999, pp. 633634.
13. Hashimoto, Y., Nishiwaki, S., Negami, T. and Wada, T., Jpn. J. Appl. Phys. 39, Suppl. 39-1 415417 (2000).
14. Wada, T., Hayashi, S., Hashimoto, Y., Nishiwaki, S., Sato, T., Negami, T. and Nishitani, M., Proceedings of the Second World Conference on Photovoltaic Solar Energy Conversion, Vienna, 1998, pp. 403406.
15. Heath, J.T., Cohen, J.D. and Shafarman, W.N., Thin Solid Films 431 –432, (2003) 426430.
16. Lee, J., Cohen, J. D. and Shafarman, W.N., Thin Solid Films 480–481, (2005) 336340.

Keywords

Variable Light Soaking Effect of Cu(In,Ga)Se2 Solar Cells with Conduction Band Offset Control of Window/Cu(In,Ga)Se2 Layers

  • Takashi Minemoto (a1), Yasuhiro Hashimoto (a2), Takuya Satoh (a3), Takayuki Negami (a4) and Hideyuki Takakura (a5)...

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