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Tellurium Secondary-Phase Defects in CdZnTe and their Association With the 1.1-eV Deep Trap
Suh, Jonghee,Hong, Jinki,Franc, J.,Bolotnikov, A. E.,Hossain, A.,James, Ralph. B.,Kim, Kihyun Professional Technical Group on Nuclear Science 2016 IEEE transactions on nuclear science Vol.63 No.5
<P>Defects located at the EC - 1.1 (eV) level, which are electro-optically active deep traps, generally have been overlooked since their presence cannot be detected except for those in highly resistive CdTe compounds. The origin of this trap is still debated on whether it is from Te vacancies or from dislocations induced by secondary phase defects in Te. We have grown high-resistivity Te-rich CZT ingots to clarify the origin of the 1.1 eV defects and to analyze the defect levels in the CZT samples by current deep level transient spectroscopy (I-DLTS) and photoluminescence (PL). From the analysis, defect levels such as shallow acceptor/donor, A-centers, Cd vacancies and Te antisite appeared to be in both high and low concentrations of Te inclusions, but the level of 1.1-eV defects exhibited dependence on the density of Te inclusion in the CZT samples. We also evaluated the effect of the 1.1-eV deep-level defects on the detector's performance in point view of carrier trapping and de-trapping.</P>
이래형(Raehyung Lee),홍진기(Jinki Hong),이덕희(Duk Hee Lee),엄재용(Jay Y. Ohm) 한국경영학회 2022 한국경영학회 통합학술발표논문집 Vol.2022 No.8
대기업과의 전속거래는 중소기업의 기술혁신에 유리한 것일까? 거래의 전속성과 기업의 기술혁신에 대해서는 서로 상반된 경쟁적인 견해가 존재하지만 이를 실증적으로 검증한 연구는 드물다. 본 연구는 한국 중소기업을 대상으로 전 산업에 걸친 5개년간의(2015-2019) 28,207 기업 패널데이터를 구성하여 이 물음을 해결한다. 또한 Pavitt(1984)의 기술 궤적 분류에 따라 5가지 세부 산업에 대해 개별적으로 가설을 검증하여 연구의 활용도를 높인다. 결과적으로 거래의 전속성은 기업의 기술혁신에 부(-)의 영향을 미치며, 세부적으로는 공급자주도형, 과학기반형 산업에서 이 관계가 검증되었다. 이 관계는 한국과 같이 추격형 혁신체제에서 탈 추격형 혁신체제로 전환중인 산업이나 기업, 국가의 혁신 전략에 시사점을 제공한다. 또한 본 연구결과는 산업별로 다른 혁신전략이 적용되어야 함을 강조하는 산업별 혁신체제론(Sectoral Innovation System)에 대한 새로운 정량적 증거이기도 한다. Does subcontracting with large enterprises promote the technological innovation of small and medium enterprises (SMEs)? There are conflicting and competing views on exclusive subcontracting and technological innovation of SMEs. Moreover, very few studies have empirically validated these views. This study answers this question using the panel data of 28,207 observations of Korean SMEs across all industries from 2015 to 2019. We tested the hypotheses individually for five sub-industries according to Pavitt’s (1984) technological trajectory classification to increase research utility. Therefore, exclusive subcontracting negatively affects the technological innovation of SMEs. This relationship was verified specifically in the supplier-dominated and science-based sectors, which has implications for innovation strategies of firms, industries, and countries (e.g. Korea) transitioning from a catch-up innovation system to a post-catch-up innovation system. These findings contribute new quantitative evidence for sectoral innovation systems that emphasises the need to apply different innovation strategies to each industry.