Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.138
Publication date: 6th July 2018
Nanocrystals can be used to achieve transition in the mid and far infrared. This is in particular promising for the design of low cost infrared photodetectors. However more need to be understood on the dynamic of carriers in narrow band gap nanocrystals. This question is nevertheless quite challenging since many conventional experimental methods such as time resolved photoluminescence cannot be used because of the low PL efficiency in the infrared nanocrystals and because of difficulties to build infrared optical setup. We have investigated two complementary ways to probe carrier dynamics in narrow band gap colloidal materials which are time resolved photoemission and transient photocurrent. To illustrate these experiments, two systems have been investigated. First I will show that pump probe experiment can be conducted while exciting 2D HgTe nanoplatelets in the near IR and while looking at relaxation with a photoemission probe. This method is very efficient to determine without contact majority and minority carrier lifetime.In the second part of the talk, I will discuss how it is possible to determine band structure parameter such as the Urbach energy from transient photocurrent measurements conducted on HgTe nanocrystals. To do so, we have built a broad bandwidth setup (from ns to ms) and bring evidence for the multi-trapping transport regime.These two methods are extremely complementary to optical time resolved spectroscopy often limited to short dynamics (ns and less)
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