Weilie Zhou, Ph.D.

Weilie Zhou

Biography

  • B.S. Nanchang Aeronautic University, Nanchang, PRC, 1985
  • M.S. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 1988
  • Ph.D. Institute of Physics, Chinese Academy of Sciences, Beijing, PRC, 1993


Contact


Research Specialties

  • Materials Sciences and Engineering
  • Condensed Matter Physics
  • Electron Microscopy


Lab Personnel

  • Jiajun Chen-Postdoc.
  • Haiqiao Su-Ph.D
  • Satish Chandra Rai-Ph.D
  • Sarah Wozny-Ph.D
  • Zhi Zheng-Ph.D
  • Shuke Yan-Ph.D
  • Nooraldeen Rafat Alkurd-Ph.D
  • Fahad Dhafer M Alqarni-M.S.
  • Manish Bhatt-Undergrad


Courses

  • CHEM 6696 (PHYS 6194)-“Practical Electron Microscopy”
  • CHEM 6696 (PHYS 6194)-“Advanced Electron Microscopy”
  • PHYS-1062, Section 001-“Fundamentals of Physics”
Research group webpage

My group research is mainly focused on the nanomaterials synthesis and characterization, and nanodevice fabrication as follows:

Synthesis of semiconductive hetero-junction nanowire (core/shell, etc) arrays using thermal evaporation, CVD, PLD, and wet chemistry methods to fabricate functional devices, such as piezo-phototronics, sensors, solar cells, supercapacitors, etc.

Three-dimensional hetero-junction nanowire arrays have attracted considerable interests due to their multi-functionalities and quantum effect as well as high surface to volume ratio. Development of semiconductive hetero-junction nanomaterials through coupling different semiconductive properties in the hetero-junction nanowires could significantly improve the device performance by tuning/controlling the charge carrier generation, recombination and/or transport across interface/junction. My research focus is to explore three-dimensional hetero-junction nanowire array synthesis using different synthesis methods, such as thermal evaporation, CVD, PLD, and wet chemistry methods to study the controlled growth and charge transfer across the interface. The hetero-junction nanowire arrays have been employed to fabricate different functional devices, such as piezotronics and piezo-phototronics (Coupling piezoelectric and semiconductive properties in core/shell nanomaterials), chemical sensors (mimicking olfactory receptor array to fabricate "electronic nose"), solar cells (using enhanced charge separation for type II solar cell integration), supercapacitors (engineering metal oxide NW arrays by doping or shell coating to achieve higher supercapacitance), etc. Emerging green materials, flexible materials, hybrid materials as well as their device fabrication are also my interests.

High efficient perovskite solar cell integrated with nanomaterials

Organometallic halide perovskites (e.g., CH3NH3PbI3 and CH3NH3PbI3-xClx) have recently emerged as a new class of light absorbers that have demonstrated a rapid progress and impressive efficiencies (>15%) for solar conversion applications. These absorbers have strong light absorption properties compared to other traditional thin film light absorbers and can be produced by a low cost solution approach. The project is investigating the synthesis of the pervoskites and integration of different nanostructures into these new emerging solar cells, ultimately, to achieve higher efficiencies for commercial applications.

Electron microscopy characterization of nanomaterails through HRTEM, CBED, STEM, EDS and EELS analysis, and In-situ FESEM and e-beam nanolithography.

As the resolution of electron microscope advanced into sub-Angstrom regime, the fine nanostructures in terms to their properties can be resolved through advanced electron microscopy. In this research, STEM, HRTEM, CBED, and EDS and EELS technique are applied in functional nanomaterails study to reveal correlation between the nanostructure and their unique properties to improve the synthesis routes, and ultimately to achieve superior properties. The in-situ measurements and e-beam nanolithography are develpoed for nanostructures and nanodevice fabrication, which is crucial to understand the properties of nanomaterails and nanodevice physics.

Image Gallery

 

Recent Papers

Rai, S.C.; Wang, K.; Chen, J.; Marmon, J. K.; Bhatt, M.; Wozny, S.; Zhang, Y.; Zhou, W. L., "Enhanced Broad Band Photodetection through Piezo-Phototronic Effect in CdSe/ZnTe Core/Shell Nanowire Array", Adv. Electron. Mater. 2015, 1400050, DOI: 10.1002/aelm.201400050 (Front cover).


Rai S. C.; Wang, K.; Ding Yong.; Marmon, J. K.; Bhatt, M., Zhang, Y.; Zhou, W.L; Wang, Z.L., "Piezo-phototronic Effect Enhanced UV/Visible Photodetector Based on Fully Wide Band GapType-II ZnO/ZnS Core/Shell Nanowire Array", ACS NANO 2015, 9 (6), 6419-6427, DOI:10.1021/acsnano.5b02081.


Jiang, C.S.; Yang, M.; Zhou, Y.; To, B.; Nanayakkara, S.U.; Luther, J.M.; Zhou, W.L.; Berry, J.J.; Lagemaat, J.; Padture, N.P.; Zhu,K.; Al-Jassim, M.M "Carrier Separation and Transport in Perovskite Solar Cells Studied by Nanometre-scale profiling of Electrical Potential", Nature Communication 2015, 6, 8397, DOI: 10.1038/ncomms9397.


Wozny, S.; Yang, M.; Nardes, A.; Mercado, C.; Ferrere, S.; Reese, M.; Zhou, W.L.; Zhu, K.; "A Controlled Humidity Study on the Formation of Higher Efficiency Formamidinium Lead Triiodide-Based Solar Cells", Chem. Mater, 2015, 27 (13), pp 4814–4820, DOI: 10.1021/acs.chemmater.5b01691


Wang, K.; Rai, S.C.; Marmon, J.; Chen, J.; Yao, K.; Wozny, S.; Cao, B.B.; Yan, Y.; Zhang, Y.; and Zhou, W.L., "Nearly Lattice Matched All Wurtzite CdSe/ZnTe Type II Core-Shell Nanowires with Epitaxial Interfaces for Photovoltaics", Nanoscale, 2014, 6, 3679 DOI: 10.1039/C3NR06137J.


Zheng Z.; Chen, J.; Yoshida R.; Gao, X.; Tarr, K.; Ikuhara, Y. H.; and Zhou, W.L., "One-step Synthesis of TiO Nanorod Arrays on Ti Foil for Supercapacitor Application" Nanotechnology 2014, 25, 435406 doi:10.1088/0957-4484/25/43/435.


Wozny, S.; Wang, K.; and Zhou, W.L., "Cu2ZnSnS4 Nanoplate Arrays Synthesized by Pulsed Laser Deposition with High Catalytic Activity as Counter Electrodes for Dye-sensitized Solar Cell Applications", J. Mater. Chem. A, 2013, 1, 15517-15523.


Zhou, Y.; Wang, K.; Han, W.; Rai, S.C.; Zhou, W.L, and Wang, Z.L.; "Vertically Aligned CdSe Nanowire Arrays for Energy Harvesting and Piezotronic Devices", ACS Nano, 2012, 6 (7), pp 6478–6482.


Chen, J.; Wang, K.; Zhou, W.L., "Vertically Aligned ZnO Nanorod Arrays Coated with SnO2/Noble Metal Nanoparticles for Highly Sensitive and Selective Gas Detection", IEEE Trans. Nanotechnology, 2011, 10, No. 5, 968.


Wang, K.; Chen, J.J.; Zhou, W.L.; Zhang, Y., Pern, J.; Yan, Y.; Mascarenhas, A., "Direct Growth of ZnO/ZnSe Highly Mismatched Type II Core/Shell Nanowire Array on Transparent Conducting Oxide (TCO) Substrate for Potential Solar Cell Application," Advanced Materials (Communication) 2008, 20, 3248.