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 |
|---|---|
| Organizer | Materials and Structures Laboratory |
| Contact | Associate 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.
