PHYSICS/BK21 SEMINAR[09.07.15]
관련링크
본문
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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)
"
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)
"
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