PbS-quantum-dots/double-wall-carbon-nanotubes nanohybrid based photodetectors with extremely fast response and high responsivity. (June 2020)

• Record Type: Journal Article
• Authors: Ka, Ibrahima; Le Borgne, Vincent; Fujisawa, Kazunori; Hayashi, Takuya; Kim, Yoong Ahm; Endo, Morinobu; Ma, Dongling; El Khakani, My Ali
• Is Part Of: Materials today energy. Volume 16(2020)
• Publication Date: 2020-06
• Subjects: Carbon nanotube -- PbS quantum dots -- Nanohybrids -- Multiple exciton generation -- Photoconductive gain; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2019.100378
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: Here, we report on the use of the pulsed laser deposition (PLD) technique to decorate double-wall carbon nanotubes (DWCNTs) with PbS quantum dots (QDs) forming thus a new class of physically synthesized nanohybrid (NH) materials, without resorting to any chemical functionalization and/or post processing. By integrating these novel DWCNTs/PbS-QDs nanohybrids into microfabricated photodetectors, we were able to demonstrate, for the first time, not only responsivities as high as 230 A W −1 (at an applied voltage of only 5 V), but also the fastest response time (of 30 μs) ever reported on carbon nanotubes and/or QDs based photodetectors. The very high responsivity of our PLD synthesized NHs is due to the synergetic contributions of both multiple exciton generation occurring in the PbS-QDs and the very efficient charge transfer from the QDs to the high mobility DWCNTs. Such a rapid charge transfer will significantly lower the transit time of the majority generated photocarriers, which in turn contributes to the occurrence of photoconductive gain in these NHs-based photodetectors. These results, clearly demonstrate the potential of the PLD technique for the physical synthesis of nanohybrids exhibiting unprecedented photoresponsive properties. Graphical abstract: Image 1 Highlights: Straightforward synthesis of novel nanohybrid material by pulsed laser deposition (PLD) technique. PLD based nanohybrid photodetector exhibiting responsivity as high as 230 A.W-1. First PLD based nanohybrid photodetector exhibiting response time as fast as 30 μs