Research on ZnS Buffer Layer by RF Magnetron Sputtering for Cu(In,Ga)Se₂ Solar Cells

Abstract:

Nanocrystalline ZnS thin films are prepared on glass substrates under various deposition conditions (radio frequency power, and sputtering pressure) using radio frequency magnetron sputtering at room temperature. Through optimization of deposition process, very thin and uniform ZnS layer was deposited to minimize the light blocking effect in short wavelength region. This paper investigates the influence of ZnS buffer layer by magnetron sputtering,and analyses structure,surface topography,and optical properties of ZnS films by using X-ray diffraction (XRD), UV-spectroscopy measurements and scanning electronic microscope (SEM) analysis techniques. Findings show that the high-quality ZnS thin films with a good crystallinity and optical properties, which is zinc blende cubic structure with a preferred orientation, can be grown by sputtering at 300W and 0.6Pa. The films exhibit the optical transparency as high as 80% in the visible region, and the resultant ZnS thin films have a high crystallinity, low defect concentration and good optical properties with the band gap of 3.50eV.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 2259-2262
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.2259
• Online since: February 2011
• Authors: Yin Qun Hua, Jie Yu, Rui Fang Chen, Cheng Chen, Rui Li Xu
• Keywords: Magnetron Sputtering, Solar Cell, Transmittance, ZnS Thin Films

References

[1] L Meng-kai. Solid State Chemistry[M]. Jinan; Shandong University publisher, 1996. (In Chinese).

[2] Gangopadhyay U, Kyunghae K, Mangalaraj D. Low cost CBD ZnS antireflection coating on large area commercial mono-crystalline silicon solar cells [J ]. Applied Surface Science, 2004, 230(1-4): 364.

DOI: 10.1016/j.apsusc.2004.02.059

[3] XU Peng, LIU Tingzhi, GUO Lan, et al. Influence of Deposited Temperature on ZnS Thin Films by Chemical Bath[J]. Materials Review, 2010, 24(2): 94-97.

[4] HUANG Hui-Fen. Investigation on composition and structure of ZnS: Mn evaporation films with sulfur supply[J]. Vacuum, 1999, 55: 127-131.

DOI: 10.1016/s0042-207x(99)00138-4

[5] T. Ben Nasr, N. Kamoun, M. Kanzari, et al. Effect of PH on the Properties of ZnS thin films grown by chemical bath deposition[J]. Thin Solid Films. 2006, 500(l/2): 4-8.

DOI: 10.1016/j.tsf.2005.11.030