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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 19, Iss. 7 — Mar. 28, 2011
  • pp: 6609–6615

Increasing surface band gap of Cu(In,Ga)Se2 thin films by post depositing an In-Ga-Se thin layer

Xiao-Hui Tan, Sheng-Lin Ye, and Xu Liu  »View Author Affiliations

Optics Express, Vol. 19, Issue 7, pp. 6609-6615 (2011)

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We have developed a simple approach to fabricate wide band gap surface layer for Cu(In,Ga)Se2 (CIGS) thin film. The Cu depleted surface layer was reconstructed by an In-Ga-Se post deposition treatment at different temperatures, which was monitored by a light controlling method. A desirable Cu concentration in surface layer has been achieved after depositing a 80nm thick In-Ga-Se layer at 400°C and the corresponding device performance is remarkably improved compared with device without surface modification. Additionally, the excess Cu2- x Se phase on the surface could also be eliminated by this method in case of high Cu/(In+Ga).

© 2011 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(310.1860) Thin films : Deposition and fabrication
(310.3840) Thin films : Materials and process characterization
(350.6050) Other areas of optics : Solar energy

ToC Category:
Thin Films

Original Manuscript: December 23, 2010
Revised Manuscript: March 6, 2011
Manuscript Accepted: March 7, 2011
Published: March 23, 2011

Xiao-Hui Tan, Sheng-Lin Ye, and Xu Liu, "Increasing surface band gap of Cu(In,Ga)Se2 thin films by post depositing an In-Ga-Se thin layer," Opt. Express 19, 6609-6615 (2011)

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  1. F. Engelhardt, M. Schmidt, Th. Meyer, O. Seifert, J. Parisi, and U. Rau, “Metastable electrical transport in Cu(In,Ga)Se2 thin films and ZnO/CdS/Cu(In,Ga)Se2 heterostructures,” Phys. Lett. A 245(5), 489–493 (1998). [CrossRef]
  2. S. H. Wei and A. Zunger, “Band offsets and optical bowings of chalcopyrites and Zn-based II-VI alloys,” J. Appl. Phys. 78(6), 3846–3856 (1995). [CrossRef]
  3. A. Rockett, D. Liao, J. T. Heath, J. D. Cohen, Y. M. Strzhemechny, L. J. Brillson, K. Ramanathan, and W. N. Shafarman, “Near surface defect distributions in Cu(In,Ga)Se2,” Thin Solid Films 431, 301–306 (2003). [CrossRef]
  4. U. Rau and M. Turcu, “Role of surface band gap widening in Cu(In,Ga)(Se,S)2 thin-films for the photovoltaic performance of ZnO/CdS/Cu(In,Ga)(Se,S)2 heterojunction solar cells,” Mater. Res. Soc. Symp. Proc. 763, 335–340 (2003).
  5. M. Turcu, O. Pakma, and U. Rau, “Interdependence of absorber composition and recombination mechanism in Cu(In, Ga)(Se,S)2 heterojunction solar cells,” Appl. Phys. Lett. 80(14), 2598–2600 (2002). [CrossRef]
  6. T. Dullweber, G. Hanna, W. Shams-Kolahi, A. Schwartzlander, M. A. Contreas, R. Noufi, and H. W. Schock, “Study of the effect of gallium grading in Cu(In,Ga)Se2,” Thin Solid Films 361(1-2), 478–481 (2000). [CrossRef]
  7. T. Nakada, H. Ohbo, T. Watanabe, H. Nakazawa, M. Matsui, and A. Kunioka, “Improved Cu(In,Ga)(S,Se)2 thin film solar cells by surface sulfurization,” Sol. Energy Mater. Sol. Cells 49(1–4), 285–290 (1997). [CrossRef]
  8. U. P. Singh, W. N. Shafarman, and R. W. Birkmire, “Surface sulfurization studies of Cu(InGa)Se2 thin film,” Sol. Energy Mater. Sol. Cells 90(5), 623–630 (2006). [CrossRef]
  9. D. Ohashi, T. Nakada, and A. Kunioka, “Improved CIGS thin-film solar cells by surface sulfurization using In2S3 and sulfur vapor,” Sol. Energy Mater. Sol. Cells 67(1–4), 261–265 (2001). [CrossRef]
  10. M. Morkel, L. Weinhardt, B. Lohmuller, C. Heske, E. Umbach, W. Riedl, S. Zweigart, and F. Karg, “Flat conduction-band alignment at the CdS/CuInSe2 thin-film solar-cell heterojunction,” Appl. Phys. Lett. 79(21), 4482–4484 (2001). [CrossRef]
  11. M. J. Romero, K. M. Jones, J. AbuShama, Y. Yan, M. M. Al-Jassim, and R. Noufi, “Surface-layer band gap widending in Cu(In,Ga)Se2 thin films,” Appl. Phys. Lett. 83(23), 4731–4733 (2003). [CrossRef]
  12. S.-H. Han, F. S. Hasoon, A. M. Hermann, and D. H. Levi, “Spectroscopy evidence for a surface layer in CuInSe2:Cu deficiency,” Appl. Phys. Lett. 91(2), 021904 (2007). [CrossRef]
  13. D. Schmid, M. Ruckh, F. Grunwald, and H. W. Schock, “Chalcopyrite defect chalcopyrite heterojunctions on the basis of CuInSe2,” J. Appl. Phys. 73(6), 2902–2909 (1993). [CrossRef]
  14. S. Nishiwaki, N. Kohara, T. Negami, H. Miyake, and T. Wada, “Microstructure of Cu(In,Ga)Se2 Films deposited in Low Se Vapor Pressure,” Jpn. J. Appl. Phys. 38(Part 1, No. 5A), 2888–2892 (1999). [CrossRef]
  15. A. Darga, D. Mencaragila, Z. Djebbour, A. Migan Dubois, J. F. Guillemoles, J. P. Connolly, O. Roussel, D. Lincot, B. Canava, and A. Etcheberry, “Two step wet surface treatment influence on the electronic properties of Cu(In,Ga)Se2 solar cells,” Thin Solid Films 517(7), 2550–2553 (2009). [CrossRef]
  16. X. H. Tan, S. L. Ye, B. Fan, K. Tang, and X. Liu, “Effects of Na incorporated at different periods of deposition on Cu(In,Ga)Se2 films,” Appl. Opt. 49(16), 3071–3074 (2010). [CrossRef] [PubMed]
  17. U.-C. Boehnke and G. Kühn, “Phase relations in the ternary system Cu-In-Se,” J. Mater. Sci. 22(5), 1635–1641 (1987). [CrossRef]
  18. T. Nakada and A. Kunioka, “Direct evidence of Cd diffusion into Cu(In,Ga)Se2 thin films during chemical-bath deposition process of CdS films,” Appl. Phys. Lett. 74(17), 2444–2446 (1999). [CrossRef]
  19. J. S. Park, Z. Dong, S. Kim, and J. H. Perepezko, “CuInSe2 phase formation during Cu2Se/In2Se3 interdiffusion reaction,” J. Appl. Phys. 87(8), 3683–3690 (2000). [CrossRef]

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