• Board
  • Seminar/Colloquim
Seminar/Colloquim

PHYSICS/BK21 SEMINAR[09.07.15]

본문

"                          
          Zinc Oxide Nanostructured Films,
                Nanoparticles and Nanowires

◆ Speaker : Prof. Neeraj Khare [Indian Institute of Technology Delhi]
◆ Place : Physics Seminar Room (Science Bldg, 3-201)
◆ Date & Time : July 15 (Wed), 16:00 ~ 17:00 pm


Abstract
  
  
Zinc oxide,  a direct wide band gap (3.37 eV)  semiconductor with large exciton  binding energy (60 meV) at room temperature,  has attracted a lot of interest in recent years due to its potential in applications in nanoscale electronics and optoelectronic devices.  This talk will discuss synthesis an properties of zinc oxide nanostructured films, nonoparticles, nanowires and its polymer composites and hetrojunctions. The nanostructured ZnO films have  been  deposited  using  rf-magnetron  sputtering  technique  whereas  the  ZnO nanowires have been synthesized by sol-gel technique.  ZnO  based  inorganic/organic hetrojunctions have been prepared using α -NPD and PEDOT: PSS p-type semiconducting organic  materials.  Nano  ZnO  polymer  composites  have  been synthesized using PANI and  PVA  polymers.  Optical  absorption  in  UV-visible  range, photoluminescence and second harmonic generation studies have been carried out for optical  characterization.  The band gap (obtained from optical absorption) and photoluminescence exciton  peak  of  ZnO  nanostructured  films  prepared  at  different substrate temperatures showed a  red  shift  which  can  not  be  fully  explained  in  the framework of size effect and has been attributed to the relaxation of the induced intrinsic compressive stress. Vertically aligned ZnO nanorods are grown on glass substrates  and these showed much enhanced second harmonic generation as compared to ZnO films.
    
  
                          Contact Person : Prof. Hu-Jong Lee(054-279-2072,  hjlee@postech.ac.kr)

"
top_btn