SEMINAR
The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences中 国 科 学 院 上 海 硅 酸 盐 研 究 所 高 性 能 陶 瓷 和 超 微 结 构 国 家 重 点 实 验 室
Thermoelectric Chalcopyrite CuGaTe2
~ High Pressure Treatment & High-temperature Formation Phases ~
Atsuko Kosuga
Graduate School of Science, Osaka Prefecture University, Sakai, Japan时间:2017年11月28日(星期二)10:30
地点:嘉定园区F楼5(1)会议室
欢迎广大科研人员和研究生参与讨论!
联系人:陈立东(4804),史迅(2803)
报告摘要:
Topic 1
The effect of room-temperature high-pressure (RTHP) treatment on the transport properties, crystal structure, and electronic structure of CuGaTe2 with chalcopyrite structure were investigated. The thermal conductivity of RTHP-treated CuGaTe2 is greatly reduced, which is attributed to the point defects, stacking faults, and increased grain boundaries from the results of theoretical analysis based on the Callaway model. These defects also decrease the carrier mobility and increase the carrier concentration, resulting in lowering the electrical conductivity and Seebeck coefficient of RTHP-treated CuGaTe2. The crystal structure analysis indicates that RTHP-treated CuGaTe2 contains microstrains, which partially arises from a series of disorder at the Cu-Ga cation site with a variety of degrees and geometries. We predicts, from the calculated formation energy, that such disorder can be induced as a metastable structure evolved by the RTHP-treatment applied in this study. Electronic structure calculations clarifies that the disorder at the Cu-Ga cation site changes orbitals hybridization near the Fermi energy. Specifically Cu 3d orbital and Te 5p orbital approach to the Fermi energy from the conduction band, which contributes to decease in the band gap, resulting in bipolar conduction. This calculation result is consistent with the experimentally observed increase in carrier concentration and decrease in Seebeck coefficient.
Y. Fujii and A. Kosuga et al., Outstanding Poster Award in ICT2016.
Y. Fujii and A. Kosuga et al., in preparation for submission.
Topic 2
Polycrystalline CuGaTe2 with a chalcopyrite-type structure consolidated by hot-pressing is a potential candidate as a medium temperature thermoelectric (TE) material. However, its high-temperature formation phases have rarely been reported to date. Here, we investigated the temperature dependent formation phases and crystal structure at 300–800 K of hot-pressed CuGaTe2. From synchrotron X-ray diffraction data and crystal structure analysis of the heating and cooling processes, it was clarified that a certain amount of impurity phases, such as Te and CuTe, precipitated from the CuGaTe2 matrix when the temperature was increased to 500–650 K. This is the temperature range where CuGaTe2 has been reported to show high TE performance. After CuGaTe2 was heated to 800 K, such impurity phases remained, even when cooled to room temperature. They also affected the tetragonal distortion and x-coordinate of Te in the CuGaTe2 matrix, probably due to deficiencies of Cu and Te in the matrix. Our results reveal detailed information on the formation phases of CuGaTe2 at high temperature and, thus, provide insight for evaluation of its high-temperature stability and transport properties.
Y. Fujii and A. Kosuga, Journal of Electronic Materials in press.
报告人简介:
Name: Atsuko KOSUGA
Address(Office): Department of Physical Science,
Graduate School of Science,
Osaka Prefecture University,
Gakuencho 1-1, Nanaku,
Sakai, Osaka 599-8531, Japan
Phone& Fax: +81-72-254-9826
E-mail : a-kosuga@p.s.osakafu-u.ac.jp
EDUCATION
March 2000 Bachelor of Engineering,
Department of Electronic, Information Systems and Energy Engineering, Graduate School of Engineering, Osaka University, Japan
March 2002 Master of Engineering,
Department of Nuclear Engineering, Graduate School of Engineering, Osaka University, Japan
July 2006 Ph. D.in Engineering, Osaka University (Supervisor: Prof. Shinsuke YAMANAKA)
WORKINGEXPERIENCE
April 2002-April 2003
Researcher at Murata Manufacturing Co., Ltd.(Japan)
?Development of electronic devices
May 2003 -March 2006
COE Assistant Professor at Osaka University(Japan)
Project: 21stcentury center of excellence towards creating new industriesbased on inter-nanoscience
?Synthesis and physical property investigation of energy related materials (thermoelectric, photocatalyst, and nuclear materials)
July 2006 -October 2006
Technical Staff atNational Institute of Advanced Industrial Science and Technology (Japan)
?Synthesis and physical property investigation of thermoelectric oxides
?Development of thermoelectric oxide modules
April 2007 –March 2010
Research Fellow of the Japan Society for the Promotion of Science (JSPS) for Young Scientistsat National Institute of Advanced Industrial Science and Technology (Japan) (Supervisor: Dr. Ryoji FUNAHASHI)
?Synthesis and physical property investigation of thermoelectric oxides
?Development of thermoelectric oxide modules
April 2012-March 2016
Special Lecture (Tenure-track Lecture) at Thermoelectric Group, Nanoscience and Nanotechnology Research Institute,Research Organizationfor the 21stCentury, Osaka Prefecture University(Japan)
?Development of high-efficient thermoelectric materials by nanostructure control?Development of eco-friendly ceramic thermoelectric materials
April 2016-Present
Tenured Associate Professor at Thermoelectric Group, Department of Physical Science, Graduate School of Science, Osaka Prefecture University (Japan)
?Study on crystal structure and transport propertiesof novel thermoelectric materials
?Development of thermoelectric materials with new function
October2017-Present
PRESTO Researcher, Japan Science and Technology Agency, Japan
?Development of thermoelectric materials and modules based on GeSbTe materials
AWARD
1. The Best Scientific Paper Award from the International Thermoelectric Society (June 2005)
2. The Best Paper Award from the Thermoelectric Society of Japan (August 2008)
3. The Best Poster Award from the Thermoelectric Society of Japan (August 2012)
4. The Award for Encouragement of Research in IUMRS-ICA2014 from IUMRS-ICA (October 2014)
5. The ITS Outstanding Poster Award from the International Thermoelectric Society (June 2016)
6. The Best Poster Award from the Thermoelectric Society of Japan (September 2016)
7. The Best Poster Award from the Japan Institute of Metals and Materials (September, 2016)
删除或更新信息,请邮件至freekaoyan#163.com(#换成@)
Thermoelectric Chalcopyrite CuGaTe2 ~ High Pressure Treatment & High-temperat..._上海硅酸盐研究所
上海硅酸盐研究所 免费考研网/2018-05-05
相关话题/联系人 嘉定 图形 报告人 会议室
上海微系统所参与2018年嘉定区“4.26”知识产权宣传周系列活动_上海微系统与信息技术研究所
为进一步推动嘉定区科创中心重要承载区新一轮行动计划的实施,加强知识产权宣传普及,提升全社会知识产权意识,结合庆祝第18个世界知识产权日,上海微系统所所地合作与产业化处积极组织了相关课题组参与了2018年嘉定区“4.26”知识产权宣传周系列活动。根据本次活动的主题“倡导创新文化尊重知识产权”——知识产 ...上海微系统与信息技术研究所 上海微系统与信息技术研究所 免费考研网 2018-05-05嘉定园区联合党支部召开党员大会专题学习贯彻党的十九大会议精神会_上海微系统与信息技术研究所
11月24日下午,嘉定园区联合党支部组织召开党员大会,专题学习贯彻党的十九大会议精神,会议由嘉定园区联合党支部书记徐聪同志主持,支部18位党员和支部联络人孔朝晖所长助理参加了会议。 会上,千人计划刘正新研究员从十九大的首日封纪念邮票上的光伏电池谈起,鼓励大家抓住当前我国科技创新的大好机遇。孟凡英研 ...上海微系统与信息技术研究所 上海微系统与信息技术研究所 免费考研网 2018-05-05嘉定园区联合党支部召开民主生活会_上海微系统与信息技术研究所
为落实所科研战略布局,促进新能源中心与工研院深度融合,发挥党员同志的模范作用,实现平稳过渡,7月7日下午,嘉定园区联合党支部在新能源中心会议室召开了民主生活会。刘正新研究员介绍了新能源中心的发展历程,展望了“工研院—微能源事业部”的前景,希望职工党员和学生党员带头宣传,克服暂时的困难,在新的平台上继 ...上海微系统与信息技术研究所 上海微系统与信息技术研究所 免费考研网 2018-05-05无线传感网事业部党支部和嘉定园区联合党支部共同组织专题党课学习_上海微系统与信息技术研究所
为贯彻中央精神,落实所党委关于推进“两学一做”学习教育常态化制度化实施方案,6月2日下午,无线传感网事业部党支部和嘉定园区联合党支部共同组织开展了专题党课学习。本次专题党课邀请了菊园新区党工委员、管委会副主任陈烨主讲,会议由事业部党支部书记练敏英主持。陈烨主任作题为“科技菊园品质菊园”的专题报告,围 ...上海微系统与信息技术研究所 上海微系统与信息技术研究所 免费考研网 2018-05-05我校留学生赴嘉定开展中外文化交流活动_上海电力学院
3月24日,我校留学生应嘉定区人民政府外事办公室邀请出席了“上海嘉定城郊文化中外友好体验活动”,多国驻沪领事代表、嘉定区副区长、市友协相关负责人出席活动。活动以参观“明止堂”拉开序幕。明止堂是古字砖专题馆,也是目前世界上收藏字砖最多的陈列馆,共收藏了从春秋战国到民国时期古砖三万余块,馆内陈列年号砖、 ...上海电力大学 上海电力学院 免费考研网 2018-05-04徐凯副书记、副校长赴国网上海嘉定供电公司访问调研_上海电力学院
12月21日,校党委副书记、副校长徐凯赴国网上海市电力公司嘉定供电公司走访交流,重点调研我校毕业生在基层供电企业的成长情况,受到了公司总经理吴建高、党委书记冯江、副总经理秦名胜等的热情接待。国网上海市电力公司人力资源部副主任陈潇、我校学生处(招生就业处)副处长张艺等陪同调研。徐凯向公司领导和校友们转 ...上海电力大学 上海电力学院 免费考研网 2018-05-04悉尼工商学院2017届毕业典礼在嘉定校区大礼堂隆重举行_上海大学
6月29日上午,悉尼工商学院2017届毕业典礼在嘉定校区大礼堂隆重举行。我校校长、党委副书记金东寒,校党委副书记、副校长、悉尼工商学院院长龚思怡,悉尼科技大学校董会副主席RonSandland、悉尼科技大学常务副校长AndrewParfitt、我校校办副主任陈大明、我校武保处副主任何金伟、学院党委书 ...学校动态信息 上海大学 免费考研网 2018-05-04知识产权学院教师赴嘉定科创核心功能区作知识产权公益讲解_华东政法大学
4月27日下午,由嘉定区菊园新区管委会联合嘉定区科委、嘉定区知识产权局共同主办的科创知享会科创核心功能区知识产权公益讲坛在平城路1055号双创大厦401会议室正式拉开序幕。我校知识产权学院肇旭副教授应邀进行首场讲座专利的竞争力构建 ...学校动态信息 华东政法大学 免费考研网 2018-05-04嘉定校区学生美育提升计划系列课程开讲_同济大学
近日,由我校团委举办的嘉定校区学生美育提升计划系列课程在嘉定校区开讲,课程旨在进一步落实同济大学“立德树人”专项行动计划,针对学生需求,更好地开展“五守五好”教育。课程初期特别设置了绘画、剪纸、沪语等课程,分别邀请了同济大学艺术与传媒学院于澎教授、同济大学附属实验小学郝小雪老师、嘉定区安亭镇文化名人 ...学校动态信息 同济大学 免费考研网 2018-05-04上海轻音乐团“上海经典老歌音乐会”唱响嘉定校区_同济大学
4月10日晚,同济大学2018年“高雅艺术进校园”系列活动之上海轻音乐团“上海经典老歌音乐会”在嘉定校区济人楼举办。党委副书记冯身洪与300多名师生共同欣赏了本场音乐会。经过对上百首上海老歌的精心挑选,上海轻音乐团通过现代流行音乐配器技巧和多媒体技术的结合,为我校师生呈现了一台极具东方韵味、优雅精致 ...学校动态信息 同济大学 免费考研网 2018-05-04