Passivation Layer of CdZnTe as Studied by Spectroscopic Ellipsometry

Jianyong Teng,Wenbin Sang,Yue Lu,Yanyan Lou,Jiahua Min,Xiaoyan Liang,Kaifeng Qin,Yongbiao Qian 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5

An oxidized layer was obtained on a cadmium zinc telluride (CZT) wafer by using chemical etching first in a KOH-KCl solution and then in an NH4F/H2O2 solution. The oxidized layer on the CZT obtained by using this method was analyzed by using ex-situ spectroscopic ellipsometry (SE) for the first time. In particular, the optical constants and the thickness of the chemical oxidized layer were obtained as functions of the oxidizing time.

In-Doped CdZnTe Crystal Growth under Controlled Te Partial Pressure

Yongbiao Qian,Wenbin Sang,Gang Li,Jiahua Min,Zhubin Shi,Chenying Zhou 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5

In-doped CdZnTe (CZT) crystals have been investigated under controlled Te partial pressure. The dependence of the electrical properties on the In dopant concentration under fixed Te partial pressure and the dependence on Te partial pressure under fixed In dopant concentration are presented. The optimized growth parameters, such as Te partial pressure, In dopant concentration, etc., were obtained for preparing In-doped CZT crystal of high resistivity up to 1010 cm. In addition, based on an In-doped compensation mechanism in CZT crystals is discussed.

In uence of In dopant on PL Spectra of CdZnTe Crystals

Jianyong Teng,Wenbin Sang,Gang Li,Zhubin Shi,Jiahua Min,Dongni Hu,Yongbiao Qian 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1

Photoluminescence (PL) spectra are used to characterize the high resistivity of an In-doped CdZnTe (CZT) crystal. The features of the PL spectra vary with changing In-dopant concentration, indicating that the In-dopant concentration has a great impact on the defect type and density and on the extent of compensation in the In-doped CZT crystal. With the addition of In donors, a new sharp neutral donor bound exciton [D0, X] peak at 1.65 eV, corresponding to In substituting defect (In+ Cd) and a new defect complex band centered at 1.505 eV, related to the singly negative complex (VCd-InCd)- are observed. Meanwhile, the intensity and position of the feature peaks in PL spectra vary with the change of the In dopant concentration, representing the changes of the defect type and density and the extent of compensation in the crystal. It conrms that the Cd vacancy or residual impurity acceptors are dominantly compensated by In donors. The measured conduction type and carrier densities are the results of compensation between Cd vacancies and In donors and Te antisites, which are related to the In-dopant concentration and the stoichiometry for the CZT crystal. Photoluminescence (PL) spectra are used to characterize the high resistivity of an In-doped CdZnTe (CZT) crystal. The features of the PL spectra vary with changing In-dopant concentration, indicating that the In-dopant concentration has a great impact on the defect type and density and on the extent of compensation in the In-doped CZT crystal. With the addition of In donors, a new sharp neutral donor bound exciton [D0, X] peak at 1.65 eV, corresponding to In substituting defect (In+ Cd) and a new defect complex band centered at 1.505 eV, related to the singly negative complex (VCd-InCd)- are observed. Meanwhile, the intensity and position of the feature peaks in PL spectra vary with the change of the In dopant concentration, representing the changes of the defect type and density and the extent of compensation in the crystal. It conrms that the Cd vacancy or residual impurity acceptors are dominantly compensated by In donors. The measured conduction type and carrier densities are the results of compensation between Cd vacancies and In donors and Te antisites, which are related to the In-dopant concentration and the stoichiometry for the CZT crystal.

웹 기반 자동 시뮬레이션을 이용한 최적 라인 설계에 관한 연구

이혜연(HYEYUN LEE),조문빈(WENBIN ZHAO),노상도(Sang Do Noh) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1

A modern manufacturing industry does carry out a lot of research for competitiveness improvement through the development of the technology in order to survive in the increasingly intense competition. Especially, manufacturing firms consume a lot of time and expenses to improve the problems of line design errors in the production phase. So there are so many efforts to achieve productivity improvements and cost savings with discovered problems in advance and resolved by decision making through verification using digital engineering techniques such as modeling & simulation in the early stages of the design. However, a number of plans for improvement are needed to configure line optimized, but there are some difficulties in the verification of optimal line design with limited scenario analysis due to the data collection and various constraints. Therefore, a variety of line design models are derived in this paper based on the input information. Based on this information, an automatically modeling / analyzing web-based system suggested line design model suitable for user aiming productivity and line balancing through the results of the analysis was proposed.

제조시스템의 모델링과 시뮬레이션을 이용한 MES 도입방안 및 효과 사전 분석에 관한 연구

SHI TING,ZHAO WENBIN,이주형(Joohyeong Lee),박승현(Seunghyun Park),노상도(Sang Do Noh) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2

Many manufacturing companies are investing in a lot of the information system to improve the competitiveness. To share information quickly between an enterprise"s information systems and support to decision-making, obtain and process information quickly and manage it efficiently and comprehensively on the production floor, Manufacturing Execution System (MES) has been introduced to the manufacturing companies. However, because each company has the different production environment, some companies haven’t obtained many effects after applying the MES system. So many minor enterprises do not to introduce the MES. This study was put forward the method of analysis the introduction methodology and effect of MES using modeling and simulation before an enterprise introduce the MES.

A Study on the Difference of Total Grip Strength and Individual Finger Force between Dominant and Non-dominant Hands in Various Grip Spans of Pliers

Yong-Ku Kong,Hyunjoon Park,Dujeong Kim,Taemoon Lee,Eunyoung Roh,Seulki Lee,Wenbin Zhao,Dae-Min Kim,Hyun-Sung Kang 대한인간공학회 2013 大韓人間工學會誌 Vol.32 No.6

Objective: The purpose of this study is to analyze the individual finger force between dominant hand and non-dominant hand and to investigate an effect of the individual finger on the total grip strength depending on dominant hand and non-dominant hand. Background: Many studies on the ratio of the grip force between dominant hand and non-dominant hand has been researched. While a 10% rule which is a ratio of the grip force between dominant hand and non-dominant hand has been applied in most studies, studies on the rate of the individual finger force between dominant hand and non-dominant hand have been insufficiently researched. Method: The experiment was preceded with 17 subjects (male, mean 25.8 ages). The individual finger force and total grip strength were measured using pliers being able to change the grip span from 45 to 80mm. Results: The difference of total grip strength between dominant hand and non-dominant hand is following 10% rule. However, the difference of individual finger force between dominant hand and non-dominant hand are not same as the difference of total grip strength. Especially in the case of grip span with 50mm, the differences between total grip strength, index finger, middle finger, ring finger, and little finger were 9.87±14.80%, 8.95±37.17%, 13.71±28.27%, 6.77±24.35%, 39.29±42.46%, respectively, with p=0.018 of statistical significance. Additionally, the results of regression analysis in 50 and 60mm of grip span showed that the difference in ring finger affected the most to the total grip strength; and the effects followed in order of index finger, middle finger, and little finger. Conclusion: Our study suggests that an effect of individual finger and grip span of pliers have to be considered when explaining the difference of the total grip strength between dominant hand and non-dominant hand. Application: This result is expected to be used for designing ergonomic hand tool.