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장주연(Jang, Juyeon),박형식(Park, Hyeongsik),안시현(Ahn, Sihyun),조재현(Jo, Jaehyun),장경수(Jang, Kyungsoo),이준신(Yi, Junsin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Cost efficient and large area deposition of superior quality Al₂O₃ doped zinc oxide (AZO) films is instrumental in many of its applications including solar cell fabrication due to its numerous advantages over ITO films. In this study, AZO films were prepared by a highly efficient rotating cylindrical dc magnetron sputtering system using AZO target, which has a target material utilization above 80%, on glass substrates in argon ambient. A detailed analysis on the electrical, optical and structural characteristics of AZO thin films was carried out for solar cell application. The properties of films were found to critically depend on deposition parameters such as sputtering power, substrate temperature, working pressure, and thickness of the films. A low resistivity of {sim}5.5{times}10-4{Omega}-cm was obtained for films deposited at 2kW, keeping the pressure and substrate temperature constant at 3 mtorr and 230?C respectively, mainly due to an increase in carrier mobility and large grain size which would reduce the grain boundary scattering. The increase in carrier mobility with power can be attributed to the columnar growth of AZO film with (002) preferred orientation as revealed by XRD analysis. The AZO films showed a high transparency of>87% in the visible wavelength region irrespective of deposition conditions. Our results offers a cost-efficient AZO film deposition method which can fabricate films with significant low resistivity and high transmittance that can find application in thin-film solar cells.
미생물제(Sphingobium sp. Cam5-1) 처리에 따른 토양 중 카두사포스의 분해효과
연제형 ( Jehyeong Yeon ),정준휘 ( Joon-hui Chung ),최한석 ( Han Suk Choi ),고영준 ( Young-joon Ko ),김다연 ( Dayeon Kim ),안시현 ( Sihyun An ),안재형 ( Jae-hyung Ahn ),한귀환 ( Gui Hwan Han ),원항연 ( Hang-yeon Weon ) 한국환경농학회 2023 한국환경농학회지 Vol.42 No.4
Cadusafos, an organophosphorus insecticide, has been commonly used against various pests worldwide. Organophosphorus pesticides have shorter half-lives and lower toxicities than organochlorine pesticides. However, excessive use of Cadusafos can increase pest resistance and issues with acetylcholine biomagnification, potentially resulting in human toxicity. In this study, we investigated the effect of a Cadusafos-degrading microbial agent (CDMA) prepared using Sphingobium sp. Cam5-1, which was previously reported to effectively degrade residual Cadusafos in soil. Experiments were conducted under both controlled laboratory and greenhouse field conditions. Under laboratory conditions, CDMA (10<sup>6</sup> cfu/g soil application rate) decomposed 97% of Cadusafos in the soil in the untreated control after 21 days. Additionally, when CDMA (10<sup>6</sup> cfu/g soil) was mixed with quicklime, 99% of Cadusafos was decomposed within 3 days. Under greenhouse field conditions, the combined effect of CDMA (10<sup>6</sup> cfu/g soil) and quicklime was not observed. However, CDMA (10<sup>6</sup> cfu/g soil) application alone was capable of decompos- ing 91% of Cadusafos after 3 days. These results indicate that CDMA can effectively decompose high residual levels of Cadusafos in soils under field conditions using a low inoculum rate.