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Cu<sub>2</sub>Te 배면 전극을 이용한 p-type CdTe 태양전지의 ohmic contact 형성 및 CdTe 태양전지의 광전압 특성
김기환,윤재호,이두열,안병태,Kim, Ki-Hwan,Yun, Jae-Ho,Lee, Doo-Youl,Ahn, Byung-Tae 한국재료학회 2002 한국재료학회지 Vol.12 No.12
In this work, CdTe films were deposited on CdS/ITO/glass substrate by a close spaced sublimation (CSS) method. A $Cu_2$Te layer was deposited on the CdTe film by evaporating $Cu_2$Te powder. Then the samples were annealed for p+ ohmic contact. TEM and XRD analysis showed that $CdTe/Cu_2$Te interface exhibited different forms with various annealing temperature. A good p+ ohmic contact was achieved when the annealing temperature was between $180^{\circ}C$ to $200^{\circ}C$. Best cell efficiency of 12.34% was obtained when post annealing temperature was $200^{\circ}C$ for 5 min. Thermal stress test of the CdS/CdTe cells with carbon back contact showed that the $Cu_2$Te contact was stable at $50^{\circ}C$ in $N_2$ and was slowly degraded at $100^{\circ}C$ in $N_2$. In comparison to the conventional carbon contact, the $Cu_2$Te contact showed a better thermal stability.
실험계획에 기반한 수돗물 성분(Chloride and Sulfate Ions)의 구조재료 부식 영향성 고찰
임동인 ( Dong-in Lim ),노흥수 ( Heng-su Noh ),권혁준 ( Hyeok-jun Kwon ),박승렬 ( Sung-ryul Park ),조만식 ( Man-sik Jo ),이두열 ( Doo-youl Lee ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.3
Corrosion management of an aircraft and its engine relies on rinsing and cleaning using tap water. Few studies have reported effects of tap water species on corrosion behaviors of structural materials. In this study, a series of experiments were conducted based on the design of experiment. Solutions with different levels of chloride and sulfate ions were prepared using a full factorial design. Two structural materials (aluminum alloy and steel) were used for an alternate immersion test. Weight loss was then measured. In addition, a silver specimen was utilized as a sensor for chloride deposition measurement. The silver specimen was examined using the electrochemical reduction method, XPS, and SEM-EDS. Surface analysis revealed that levels of chloride and sulfate ions were sufficient for the formation of silver chloride and silver surface. Statistical analysis of weight loss and chloride deposition rate showed significant differences in measured values. Concentration of chloride ions greatly affected corrosion behaviors of structural materials. Sulfate ion hindered the adsorption reaction. These results emphasize the importance of controlling ion concentration of tap water used for cleaning and rinsing an aircraft.