报告题目：I-VI族II型半导体核/壳纳米阵列: 从光伏到光探头

报告题目(英文）：I-VI Type II Semiconductor Core/Shell Nanowire Arrays: From Photovoltaics to Photodetectors
报告人姓名：Weilie Zhou

报告时间：2015-06-01 10:00
报告地点：校本部东区材料学院B526

报告人单位：美国新奥尔良大学（The University of New Orleans），先进材料研究所（AMRI）

报告人简介：周维列，美国新奥尔良大学（The University of New Orleans）教授，先进材料研究所（AMRI）电镜室主任。1993年从中国科学院沈阳金属研究所毕业获博士学位，师从我国透射电镜奠基人郭可信院士。博士毕业后先后在日本精细陶瓷中心（JFCC）和美国凯斯西储大学（Case Western Reserve University）作博士后，1998年进入美国新奥尔良大学至今。周教授长期从事半导体异质结纳米线阵列的制备和表征，以及由这些材料制备的纳米器件在传感器、太阳能电池以及自旋电子学领域的应用。已经发表专著2部，在Nanolett, Adv. Mater., JACS等著名学术刊物发表论文150余篇。
报告内容简介：The charge separation is often facilitated by a type II or staggered energy alignment of a heterojunction, constructed by two materials for which both the valance and conduction band of one component lie respectively lower in energy than those of the other component. Such heterojunctions have been intensively studied for solar cell applications. To improve the carrier transport within the type II scheme, core/shell all-inorganic nanowire architectures have also been investigated to improve the carrier transport for both the electron and hole using the well-known II-VI and III-V binary semiconductors, such as ZnO/ZnSe, ZnO/ZnS, CdSe/ZnTe, GaN/GaP, GaN/GaAs. In this talk, I will talk about II-VI type II semiconductor core/shell nanowire array synthesis, transmission electron microscopy (TEM) characterization and device measurements for photovoltaics. As the ZnO and CdSe nanowire arrays are of piezoelectrical properties under external loads, the core/shell nanowire arrays devices further present enhanced broad band photodetection through piezophotronic effect under different strain modes, which demonstrate the advantage of coupling effect of the devices built on three-dimensional (3D) nanoarchitectures.