GaAs－InP复合材料的外延生长方法及金属半导体场效应晶体管器件制备

提出了一种新的生长过渡层的方法，并利用低压金属有机气相外延技术在ＩｎＰ衬底上生长出高质量ＧａＡｓ外延材料，用Ｘ射线双晶衍射测得５μｍ厚ＧａＡｓ外延层的（００４）晶面衍射半峰高宽（ＦＷＨＭ）低至１４０ａｒｃｓｅｃ。并制出ＧａＡｓ金属半导体场效应晶体管（ＭＥＳＦＥＴ），其单位跨导为１００ｍｓ／ｍｍ，可满足与长波长光学器件进行单片集成的需要。     

GaAs—InP复合材料的外延生长方法及金属半导体场效应晶体管器件制备

提出了一种新的生长过渡层的方法，并利用低压金属有机气相外延技术在ＩｎＰ初底上生长出高质量ＧａＡｓ外延材料，用Ｘ射线双晶衍射测得５μｍ厚ＧａＡｓ外延层的晶面衍射半峰高宽（ＦＷＨＭ）低至１４０ａｒｃ ｓｅｃ。并制出ＧａＡｓ金属半导体场效应晶体管（ＭＥＳＦＥＴ），其单位跨导为１００ｍｇ／ｍｍ，可满足与长波长光这器件进行单片集成的需要。     

VInH4在InP材料中的影响

在未掺杂和掺Ｆｅ的ＬＥＣ－Ｉｎ中用ＦＴ－ＩＲ测试到ＶＩｎＨ４的存在。已经证实该缺陷在ＬＥＣ－ＩｎＰ中普遍存在。经研究表明在掺Ｆｅ的ＩｎＰ中的ＶＩｎＨ４浓度比在未掺杂中的高。而在同一晶锭中其浓度分布是头部高,尾部低。讨论了其对未掺杂ＩｎＰ的电子特性和掺Ｆｅ的ＩｎＰ的补偿的影响,及其对ＩｎＰ热稳定性的影响。     

GaN的MOVPE生长和m－i－n型蓝光LED的试制

利用自行研制的常压ＭＯＶＰＥ设备和全部国产ＭＯ源，采用低温生长缓冲层技术，在蓝宝石（α－Ａｌ２Ｏ３）衬底上获得了高质量的ＧａＮ外延层。未掺杂的ＧａＮ外延层的室温电子迁移率已达１１４ｃｍ２／Ｖ．ｓ，载流于浓度为２×１０１８。７７Ｋ光致发光谱近带边发射峰波长为３６５ｎｍ，其线宽为４ＤｍｅＶ。Ｘ射线双晶衍射回摆曲线的线宽为３６０ａｒｃｓｅｃ。用Ｚｎ掺杂生长了绝缘的ｉ－ＧａＮ层。在此基础上研制了ｍ－ｉ－ｎ型ＧａＮ的ＬＥＤ，并在室温正向偏压下发出波长为４５５ｎｍ的蓝光。     

GaN材料的GSMBE生长

在国内首次用ＮＨ３作氮源的ＧＳＭＢＥ方法在α－Ａｌ２Ｏ３衬底上生长出了ＧａＮ单昌外延膜。ＧａＮ生长速率可达０．５μｍ／ｈ。ＧａＮ外延膜的（０００２）双晶Ｘ射线衍射峰回摆曲线的半高宽最窄为８ａｒｃｍｉｎ。霍尔迁移率为５０ｃｍ＾２／Ｖ．ｓ。对质量好的ＧａＮ膜，室温阴性发光谱上只有一个强而锐的近岸边发光峰，谱峰位于３７２ｎｍ处，谱峰半高宽为１４ｎｍ（１２５ｍｅＶ）。     

硅外延发展趋势

本文综述了硅外延的三大发展趋势，指出降低外延温度是外延发展的迫切要求，同时比较了分子速外延（ＭＢＥ）、光能增强化学汽相淀积（光ＣＶＤ）、等离子体增强化学上淀积（ＰＥＣＶＤ）、超高真空化学汽相淀积（ＵＨＶＣＶＤ）的优缺点，指出ＵＨＶＣＶＤ和ＰＥＣＶＤ二者合二为一是最具应用前景的方法。其次，论述了异质外延和ＳｉＧｅ／Ｓｉ超晶格材料的应用前景。最后，论述了外延生长的原位监测和外延膜的测试技术。     

硅外延发展趋势

本文综述了硅外延的三大发展趋势，指出降低外延温度是外延发展的迫切要求；同时比较了分子束外延（ＭＢＥ）、光能增强化学汽相淀积（光ＣＶＤ）、等离子体增强化学汽相淀积（ＰＥＣＶＤ）、超高真空化学汽相淀积（ＵＨＶＣＶＤ）的优缺点，指出ＵＨＶＣＶＤ和ＰＥＣＶＤ二者合二为一是最具应用前景的方法。其次，论述了异质外延和ＳｉＧｅ／Ｓｉ超晶格材料的应用前景。最后，论述了外延生长的原位监测和外延膜的测试技术。     

超负磁致伸缩晶体Sm－Fe、Sm－Dy－Fe和Sm－Dy－Fe－Al的研究

本文研究了轻稀土负磁致伸缩ＳｍＦｅ＿ｘ（１．４０＜ｘ＜１．９４），Ｓｍ＿ｘＤｙ＿（１－ｘ）Ｆｅ＿ｙ（０．８４＜ｘ＜０．９２．１．８０＜ｙ＜１．９０），Ｓｍ＿（０．９０）Ｄｙ＿（０．１０）（Ｆｅ＿（０．９５）Ａｌ＿（０．０５））＿（１．８０）晶体的制备、热处理及磁学性能，发现ＳｍＦｅ＿ｘ合金的λ－ｘ曲线存在两个峰值，峰值的ｘ点随热处理发生的变化有一定的规律性，还比较了热处理前后，Ｓｍ－Ｆｅ、Ｓｍ－Ｄｙ－Ｆｅ和Ｓｍ－Ｄｙ－Ｆｅ－Ａｌ的相组成对性能的影响。热处理用于改善磁致伸缩性能，并且制得了高磁致伸缩性能的ＳｍＦｅ＿２和（Ｓｍ，Ｄｙ）Ｆｅ＿２合金。     

1.3—1.55μm GeSi异质结红外探测器的研制

采用快速加热，超低压化学气相淀积方法，在－Ｇｅ衬底上外延生长－ＧｅＳｉ－Ｓｉ薄层，首次研制成功了１．３－１．５５μｍ波段的ＧｅＳｉ异质结红外探测器，其主要参数性能优于该波段的同类型Ｇｅ探测器。     

GexSi1-x材料生长的改善

利用超高真空化学相淀积（ＵＨＶ／ＣＶＤ）系统在６５０℃生长出表面光亮的ＧｅＳｉ单晶。在１２００Ｌ／ｍｉｎ分子泵与前级机械泵间串接４５０Ｌ／ｍｉｎ分子泵,改善了生长环境。串接分子泵后生长的样品的Ｘ射线双晶衍射分析表明,外延层衍射峰半宽仅为１９８ａｒｃｓｅｃ,且出现了Ｐｅｎｄｅｌｌｏｓｕｎｇ干涉条纹,说明外延层结晶质量很好。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.