Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.149
Publication date: 22nd December 2022
In the short-wavelength infrared range, there is poor or no availability of cheap and optically tunable bulk semiconductors for optoelectronic applications like telecommunications and sensing in automated transport. Semiconducting colloidal quantum dots like lead chalcogenides instead, display bandgap tunability (800-3000 nm) with size and are cheaply synthesized in solution. Unfortunately, due to their deposition techniques, thin films of such materials are disordered and therefore display poor transport properties. Self-assembled arrays of colloidal quantum dots, the so called superlattices, are expected to lead to coherent transport through minibands therefore approaching the electronic properties of the bulk counterparts. Nevertheless, the poor control on the ordering, on the electronic coupling and on surface trap passivation has led to the observation of disappointing charge transport properties.
Here [1] we report the self-assembly of highly ordered 3D superlattices with tunable structure and thickness with single layer precision. The superior quality of such superlattices is demonstrated by a combination of advanced structural characterization techniques like atomic resolution electron microscopy and grazing incidence X-Ray scattering. We measure in-plane coherence lengths up to 100 nm but most noticeably, the superlattices are fully coherent throughout their thickness. This outstanding ordering results in record electron mobilities up to 278 cm2/Vs as measured in a field effect transistor using ionic gel as gate dielectric. This value is not only approaching the bulk mobility, but it is a record among any self-assembled superlattice with fully quantum-confined nanocrystals as building blocks. Such findings demonstrate that we were able to obtain an optoelectronic metamaterial and this could pave the way for a new generation of optoelectronic devices with highly tunable properties.
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