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PbS-quantum-dots/double-wall-carbon-nanotubes nanohybrid based photodetectors with extremely fast response and high responsivity
Materials Today Energy ( IF 9.3 ) Pub Date : 2020-01-18 , DOI: 10.1016/j.mtener.2019.100378
Ibrahima Ka , Vincent Le Borgne , Kazunori Fujisawa , Takuya Hayashi , Yoong Ahm Kim , Morinobu Endo , Dongling Ma , My Ali El Khakani

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.



中文翻译:

基于PbS量子点/双壁碳纳米管的纳米杂化光电探测器,具有极快的响应速度和高响应度

在这里,我们报道了使用脉冲激光沉积(PLD)技术来装饰具有PbS量子点(QD)的双壁碳纳米管(DWCNT),从而形成了一类新的物理合成的纳米杂化(NH)材料,任何化学功能化和/或后处理。通过将这些新颖的DWCNT / PbS-QDs纳米杂化体集成到微制造的光电探测器中,我们能够首次证明不仅具有高达230 A W -1的响应能力(在仅5 V的施加电压下),而且是基于碳纳米管和/或基于QD的光电探测器所报告的最快的响应时间(30μs)。我们PLD合成的NHs的极高的响应度是由于PbS-QD中发生的多种激子产生的协同作用以及从QD到高迁移率DWCNT的非常有效的电荷转移。这种快速的电荷转移将显着降低大多数生成的光电载体的传输时间,这反过来又有助于在这些基于NHs的光电探测器中出现光电导增益。这些结果清楚地证明了PLD技术在物理合成显示出前所未有的光响应特性的纳米杂交体方面的潜力。

更新日期:2020-01-18
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