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급속열처리가 다결정 CaTe 박막의 물성에 미치는 효과에 관한 연구
조영아(Y. A. Cho),이용혁(Y. H. Lee),윤종구(J. K. Yoon),오경희(K. H. Oho),염근영(G. Y. Yeom),신성호(S. H. Shin),박광자(K. J. Park) 한국진공학회(ASCT) 1996 Applied Science and Convergence Technology Vol.5 No.4
CdS/ITO/glass 기판위에 다결정 CdTe 박막을 진공증착법으로 제조한 후 급속열처리하여 열처리 온도와 가스분위기가 CdTe의 박막의 물성과 전지특성에 미치는 효과를 연구하였다. 450℃에서 550℃까지 공기 중 급속열처리한 경우 박막은 EDX 조성분석결과 화학양론비를 유지하였고 표면성분비는 Cd-rich 상태였으나 전처리후 저저항 contact 제조에 유리한 Te-rich 상태로 변화되었다. TEM과 micro-EDX 결과 급속열처리 전후 모두 CdTe는 주상정구조가 관찰되었고 열처리동안 CdTe내로 확산된 S의 양이 로열처리와 비교하여 매우 적음을 알 수 있었다. 급속열처리 온도와 가스분위기 조건 중 공기 중에서 550℃ 열처리하였을 때 가장 우수한 태양전지효율을 나타내었다. Rapid thermal annealing (RTA) was applied to polycrystalline CdTe thin films evaporated on CdS/ITO/glass substrate and the effects of the annealing temperatures and the atmosphere on physical properties of polycrystalline CdTe thin films and CdTe/CdS solar cell characteristics were studied. Results obtained by EDX showed that the bulk composition of CdTe remained stoichiometric after annealing at 550℃ in the air but the surface composition became Cd-rich. Cross-sectional TEM and micro-EDX showed that columnar grains and micro-twins remained even after RTA, however, and the sulfur content in the annealed CdTe (added by sulfur diffusion from CdS during the annealing) was much smaller than that by furnace annealing. Among the investigated RTA temperatures and gas environments, the cell made with CdTe annealed at 550℃ in air showed the best solar energy conversion efficiency.
탄소중립과 디지털전환에 대응하는 농업용 UGV의 특허분석
홍성훈(S. H. Hong),신대영(D. Y. Shin),이철희(C. H. Lee),이용혁(Y. H. Lee) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.12
Diesel engines, which have been used as major power sources for agricultural machinery, have large low-speed torque, are resistant to moisture, and have simple structures such as no ignition system, which have few failures and advantages in maintenance. However, major developed countries around the world are gradually strengthening their drive for decarbonization through energy transition for carbon neutrality, agricultural machinery cannot be an exception to this trend. Along with the power source of eco-friendly agricultural machinery for decarbonization, autonomous platform based on digital transformation technology is also emerging as an important core technology. In this paper, published and granted patents since 2001 were analyzed to analyze the power sources of agricultural machinery and technology trends related to digital transformation. The classification was divided into digital transformation, special-purpose mobile platform, and low-and-zero carbon technology, and each technology was subsequently divided into three to four detailed technologies. This analysis targeted the US, Japan and Europe along with Korea, and major competitors of each target country were also analyzed. As a result, target technologies were analyzed in the early development stage from the perspective of the technology growth stage. Therefore, related R&D investment are required to secure global competitiveness and lead related markets.