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금속염화물 전구체용액을 이용한 태양전지용 CIS/CIGS계 광흡수층의 제조와 특성
이유국 ( You Guk Lee ),이동구 ( Dong Gu Lee ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.11
Cu(In,Ga)Se2 (CIS/CIGS) absorber films were economically synthesized using metal chloride (CuCl2, InCl3, GaCl3, and SeCl₄) precursors in acetone solution with no addition of organic binders for doctor bladed deposition. Heat treatment was applied to CIS/CIGS precursors from 100 to 500 ℃ and the crystallinity and surface morphologies were investigated by FESEM, XRD, etc. It was observed that CIS crystals began to form at 300 ℃ and as the metal chloride concentration in the precursor solution became higher and the heat treatment temperature increased, then the CIS crystal size grew larger and the crystallinity was better. In addition, with the substitution of Ga for In, the (112) main peak in the CIS absorber layer shifted to a higher angle due to a decrease in the lattice parameter and its energy band gap increased. The best quality CIS film was obtained from a CIS concentration of 0.4 M / 0.4 M / 0.8 M with heat treatment of 500 ℃ for 30 minutes.
이양규,허성택,이유국,이동구 한국전기전자재료학회 2010 Transactions on Electrical and Electronic Material Vol.11 No.4
Nano-sized MgO single crystal powders have recently been reported to emit ultraviolet by stimulation of electrons in a vacuum. In this study, nanocrystalline MgO powders were applied to a xenon plasma flat fluorescent lamp (FFL) for a liquid crystal display backlight to improve its emission efficiency through the extra ultraviolet from the nano-MgO crystals. For comparison, a MgO nano-thin film was applied directly on the phosphors inside a lamp panel through e-beam evaporation. Adding MgO nano-crystal powders to the phosphors improved the luminance and efficiency of FFLs by around 20% and MgO nano-crystal coverage of 40% of the phosphor provided the best FFL emission characteristics; however, application of MgO thin film to the phosphors degraded the emission characteristics, even compared to FFLs without MgO. This was due to insufficient ultraviolet stimulation of the phosphors and the crystallinity and low secondary electron coefficient of the MgO.