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Báo cáo toán học: " Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering | Hwang et al. Nanoscale Research Letters 2012 7 26 http www.nanoscalereslett.eom content 7 1 26 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering Dong Hyun Hwang 1 Jung Hoon Ahn1 Kwun Nam Hui1 Kwan San Hui2 and Young Guk Son1 Abstract Zinc sulfide ZnS thin films were deposited on glass substrates using radio frequency magnetron sputtering. The substrate temperature was varied in the range of 100 C to 400 C. The structural and optical properties of ZnS thin films were characterized with X-ray diffraction XRD field emission scanning electron microscopy FESEM energy dispersive analysis of X-rays and UV-visible transmission spectra. The XRD analyses indicate that ZnS films have zinc blende structures with 111 preferential orientation whereas the diffraction patterns sharpen with the increase in substrate temperatures. The FESEM data also reveal that the films have nano-size grains with a grain size of approximately 69 nm. The films grown at 350 C exhibit a relatively high transmittance of 80 in the visible region with an energy band gap of 3.79 eV. These results show that ZnS films are suitable for use as the buffer layer of the Cu In Ga Se2 solar cells. Keywords ZnS film RF magnetron sputtering solar cell Cd-free buffer layer Background Generally Cu In Ga Se2 CIGS solar cells are fabricated using a cadmium sulfide CdS buffer layer in order to protect the junction region from sputtering damage during subsequent n-type zinc oxide deposition and to modify the surface of p-type CIGS absorber 1 . CdS is the most promising buffer layer for thin film hetero-junction solar cells and the highest conversion efficiencies have been achieved with the chemical bath-deposited CdS buffer layer in CIGS solar cells. The chemical bath deposition CBD technique which is also known as solution growth or chemical deposition has emerged as a rather efficient method for the .