DOI QR코드

DOI QR Code

A Study on the Electrical and Optical Properties of CdS Thin Films Deposited with Different Conditions for Solar Cell Applications

태양전지용 CdS 박막의 제조 조건에 따른 전기적 광학적 특성에 관한 연구

  • 이재형 (군산대학교 전자정보공학부)
  • Published : 2008.07.01

Abstract

Cadmium sulphide (CdS) thin film, which is used as a window layer of heterojunction solar cell, on the glass substrate was deposited by vacuum evaporation. Effects of deposition conditions such as the source and substrate temperature on electrical and optical properties of CdS films was investigated. As the source temperature was increased, the deposition rate of CdS films was increased. In addition, the optical transmittance and the electrical resistivity of CdS films were decreased as the source temperature was increased. This results were attributed to the increase of excess Cd amount in the film. The crystal structure of CdS films exhibited the hexagonal phase with preferential orientation of the (002) plane. As the substrate temperature was increased, the crystal structure of CdS films was improved and the resistivity of the films was increased due to the decrease of excess Cd in film.

References

  1. M. A. Green, K. Emery, Y. Hishikawa, and W. Warta, 'Solar cell efficiency tables', Prog. Photovolt: Res. Appl., Vol. 16, p. 61, 2008 https://doi.org/10.1002/pip.808
  2. 이재형, 송우창, 남준현, 박용관, 신성호, 박광자, 'CdS/CdTe 태양전지 특성에 미치는 CdTe 박막의 기판온도 영향에 관한 연구', 전기전자재료학회논문지', 10권, 4호, p. 369, 1997
  3. 이재형, 'CdS 박막의 제조 방법에 따른 물성 및 CdS/CdTe 이종접합의 전기적 특성 분석', 전기전자재료학회논문지, 18권, 3호, p. 199, 2005 https://doi.org/10.4313/JKEM.2005.18.3.199
  4. M. A. Contreras, K. Ramanathan, J. AbuShama, F. Hasoon, D. Young D. B. Egass, and R. Noufi, 'Diode characteristics in state-of-the-art ZnO/CdS/CuIn(1-x)GaxSe2 solar cells', Prog. Photovolt: Res. Appl., Vol. 13, p. 209, 2005 https://doi.org/10.1002/pip.626
  5. A. L. Fahrenbruch, V. Vasilchenko, F. Buch, K. Mitchell, and R. H. Bube, 'II-VI photovoltaic heterojunctions for solar energy conversion', Appl. Phys. Lett., Vol. 25, No. 10, p. 605, 1974 https://doi.org/10.1063/1.1655329
  6. S. Albright, B. Ackerman, and J. F. Jordon, IEEE Trans. Electron Devices, Vol. ED-37, p. 434, 1990
  7. B. E. McCandless and S. S. Hegedus, 'Influence of CdS window layers on thin film CdS/CdTe solar cell performance', Proc. 22th IEEE Photovoltaic Specialists Conferences, p. 967, 1991
  8. T. L. Chu, S. S. Chu, C. Ferekides, C. Q. Wu, J. Britt, and C. Wang, 'High efficiency CdS/CdTe solar cells from solution-growth CdS films', Proc. 22th IEEE Photovoltaic Specialists Conferences, p. 952, 1991
  9. S. Y. Kim, 'Electrical and Optical Properties of CdS Thin Films Prepared by Electrodeposition and Vacuum Evaporation', Ph. D. thesis, KAIST, 1993
  10. G. A. Somorjai and D. W. Jepson, J. Chem. Phy., Vo. 41, p. 1389, 1964 https://doi.org/10.1063/1.1726078
  11. R. W. Buckley and J. Woods, 'Variations in resistivity of evaporated film of cadmium sulfide', J. Phy. D:Appl. Phys., Vol. 6, p. 1084, 1973 https://doi.org/10.1088/0022-3727/6/9/312
  12. T. L. Chu, S. S. Chu, N. Schultz, C. Wang, and C. Q. Wu, 'Solution-grown cadmium sulfide films for photovoltaic devices', J. Electrochem. Soc., Vol. 139, No. 9, p. 2443, 1992 https://doi.org/10.1149/1.2221246
  13. Jayakrishnan, S. R. Kumar and R. K. Pandey, 'Rapid thermal annealing of multiple dip- coated CdS films', Semicond. Sci. Technol., Vol. 9, p. 97, 1994 https://doi.org/10.1088/0268-1242/9/1/017
  14. A. L. Fahrenbruch and R. H. Bube, 'Fundamentals of Solar Cells', Academic Press, Chap. 3, 1983
  15. R. W. Keys, Commun. Solid State Phys., Vol. 7, p. 149, 1977
  16. K. F. Berggren and B. E. Sermelius, Phys. Rev. B, Vol. 24, p. 1971, 1981 https://doi.org/10.1103/PhysRevB.24.1971
  17. H. D. Kim, 'Preparation and Photovoltaic Properties of Sintered CdS/CdTe Solar Cells with TCO Films', Ph. D. thesis, KAIST, 1995
  18. J. I. B. Wilson and J. Woods, J. Phys. Chem. Solids, Vol. 34, p. 171, 1973 https://doi.org/10.1016/0022-3697(73)90074-7
  19. A. Ashour, N. El-Kadry, and S. A. Mahmoud, 'On the electrical and optical properties of CdS films thermally deposited by modifed source', Thin Solid Films, Vol. 269, p. 117, 1995 https://doi.org/10.1016/0040-6090(95)06868-6