Transport in ITO Nanocrystals with Short- to Long-Wave Infrared Absorption for Heavy Metal-Free Infrared Photodetection - Archive ouverte HAL Access content directly
Journal Articles ACS Applied Nano Materials Year : 2019

Transport in ITO Nanocrystals with Short- to Long-Wave Infrared Absorption for Heavy Metal-Free Infrared Photodetection

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Charlie Gréboval
Audrey Chu
Julien Ramade
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  • PersonId : 780221
  • IdRef : 197844219

Abstract

Nanocrystals are often described as interesting materials for the design of low-cost optoelectronic devices especially in the infrared range. However the driving materials reaching infrared absorption are generally heavy metal-containing (Pb and Hg) with a high toxicity. An alternative strategy to achieve infrared transition is the use of doped semiconductors presenting intraband or plasmonic transition in the short, mid and long-wave infrared. This strategy may offer more flexibility regarding the range of possible candidate materials. In particular, significant progress have been achieved for the synthesis of doped oxides and for the control of their doping magnitude. Among them, tin doped indium oxide (ITO) is the one providing the broadest spectral tunability. Here we test the potential of such ITO nanoparticles for photoconduction in the infrared. We demonstrate that In2O3 nanoparticles present an intraband absorption in the mid infrared range which is transformed into a plasmonic feature as doping is introduced. We have determined the cross section associated with the plasmonic transition to be in the 1-3x10-13 cm 2 range. We have observed that the nanocrystals can be made conductive and photoconductive due to a ligand exchange using a short carboxylic acid, leading to a dark conduction with n-type character. We bring evidence that the observed photoresponse in the infrared is the result of a bolometric effect.
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Dates and versions

hal-02043472 , version 1 (31-10-2019)

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Junling Qu, Clément Livache, Bertille Martinez, Charlie Gréboval, Audrey Chu, et al.. Transport in ITO Nanocrystals with Short- to Long-Wave Infrared Absorption for Heavy Metal-Free Infrared Photodetection. ACS Applied Nano Materials, 2019, ⟨10.1021/acsanm.9b00067⟩. ⟨hal-02043472⟩
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