Top Page » Past Lecture & Seminar (2013) » 268th MSL Lecture(Mr. My Ali El Khakani,Institut National de la Recherche Scientifique, University of Quebec, Canada)
268th MSL Lecture(Mr. My Ali El Khakani,Institut National de la Recherche Scientifique, University of Quebec, Canada)
Place Meeting Room, R3 Building 1F, TIT Suzukake Campus
OrganizerMaterials and Structures Laboratory
ContactAssociate Professor, Nobuhiro Matsushita (ex:5310)

Subject & Detail

268th MSL Lecture

Lecturer:Mr. My Ali El Khakani (Professor,Institut National de la Recherche Scientifique (INRS-EMT), University of Quebec, Quebec, Canada)

Subject: The Pulsed Laser Ablation Route for the Controlled Synthesis of Nanomaterials for Photoactive Device Applications

Summary:The pulsed laser ablation (PLA) is a powerful and straightforward technique for the synthesis of various forms of nanomaterials and nanohybrids. We will highlight briefly our work on the synthesis of single-wall carbon nanotubes (SWCNT) by means of the KrF-PLA technique, with a particular emphasis on the effect of the growth temperature and catalyst content of the graphite target on their structural characteristics and optoelectronic properties1. The as-produced SWCNT were integrated into SWCNT/n-Si hybrid photovoltaic (PV) devices and their photoconversion properties evaluated.2,3 These PV devices have shown to exhibit external quantum efficiencies (EQE) of ~60%, and a power conversion efficiency of ~6.6%. On the other hand, highly-crystalline PbS nanoparticles (NPs) have been PLA-grown onto various substrates with the latitude to tailor their size, and hence their photoluminescence properties, over the (850-1650) nm range.4 Finally, the PLA was used to fabricate novel nanohybrid materials by controllably decorating SWCNT Mats by PbS-NPs. The integration of these SWCNT/PbS-NPs nanohybrids (NHs) into functional devices revealed their remarkable photoconduction (PC) properties.5 By optimizing the structural and electrical properties of the PbS-NPs and SWCNTs film, respectively, these NHs-based PC devices are shown to exhibit a photoresponse as high as ~700 % and ~1400 % at the respective 633 and 405 nm excitation wavelengths. While the PV properties of the SWCNT based devices were shown to correlate to a figure-of-merit of the opto-electric properties of the SWCNT films,6 the PC behavior of the SWCNT/PbS-NPs nanohybrids is thought to result from the efficient charge transfer between light absorbing PbS-NPs and fast charge-conveying SWCNT network.

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