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Jeha Kim 한국진공학회(ASCT) 2019 Applied Science and Convergence Technology Vol.28 No.6
We investigate the effect of hydrazine on the growth and physical characteristics of ZnS thin films deposited on both soda–lime glass (SLG) and copper indium gallium selenide (CIGS)/Mo/SLG substrates as a function of the relative molar ratio of hydrazine to ammonia reagent, rc, for various deposition times td. As rc is varied from 0 to 0.56, all the ZnS films on SLG (thickness of d ~ 38 nm) with hydrazine exhibit an amorphous structure, [S/Zn] composition of ~ 0.65, and direct energy bandgap of Eg = 3.54 – 3.75 eV. To compare the difference in device quality corresponding to the two types of substrates, we fabricate CIGS solar cells using ZnS buffers grown under conditions of rc = 0.28, 0.42 for td = 30 min, 15 min and without hydrazine with rc = 0.0 and td = 90 min. The sample obtained with the ZnS buffer under conditions of rc = 0.28, td = 30 min exhibits the best solar cell performance of η = 12.03 %. Our results prove that using hydrazine for ZnS buffer layer preparation via chemical bath deposition can significantly enhance the film quality for CIGS solar-cell fabrication.
JongHyeobBaeK,HyunWooSong,SungBockKim,NamHwang,JehaKim,DaeKonOh 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.3
We investigated the degradation behaviors of 1310-nm spot-size converter integrated laser diodes (SSC-LDs) grown by using the metal-organic chemical-vapor deposition (MOCVD) method. The vertically tapered SSC and the active region employing a buried heterostructure were butt-jointed to each other. The characteristic temperature of the SSC-LD was compared with that of an LD without the SSC. All chips experienced the burn-in test before long-term life scanning. The slope eciencies of the SSC-LDs scarcely changed after the aging process, indicating that no further degradation accurred within the active region. This work focused mainly on the role of the SSC in device degradation behavior.